WO2018190030A1 - 発光素子および発光装置 - Google Patents
発光素子および発光装置 Download PDFInfo
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- WO2018190030A1 WO2018190030A1 PCT/JP2018/008234 JP2018008234W WO2018190030A1 WO 2018190030 A1 WO2018190030 A1 WO 2018190030A1 JP 2018008234 W JP2018008234 W JP 2018008234W WO 2018190030 A1 WO2018190030 A1 WO 2018190030A1
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- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0087—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials
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- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H01S5/18302—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL] comprising an integrated optical modulator
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- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H01S5/18386—Details of the emission surface for influencing the near- or far-field, e.g. a grating on the surface
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- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H01S5/18386—Details of the emission surface for influencing the near- or far-field, e.g. a grating on the surface
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- H01S5/00—Semiconductor lasers
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
- H01S5/343—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
- H01S5/34333—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser with a well layer based on Ga(In)N or Ga(In)P, e.g. blue laser
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- H01S5/00—Semiconductor lasers
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
- H01S5/343—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
- H01S5/34346—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser characterised by the materials of the barrier layers
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- H01S5/02469—Passive cooling, e.g. where heat is removed by the housing as a whole or by a heat pipe without any active cooling element like a TEC
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- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H01S5/18305—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL] with emission through the substrate, i.e. bottom emission
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- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H01S5/18308—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL] having a special structure for lateral current or light confinement
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- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H01S5/18361—Structure of the reflectors, e.g. hybrid mirrors
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- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H01S5/18361—Structure of the reflectors, e.g. hybrid mirrors
- H01S5/18369—Structure of the reflectors, e.g. hybrid mirrors based on dielectric materials
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- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/42—Arrays of surface emitting lasers
- H01S5/423—Arrays of surface emitting lasers having a vertical cavity
Definitions
- the present disclosure relates to a light emitting element and a light emitting device.
- a technique for converting the wavelength of light emitted from a surface emitting laser is disclosed.
- the light emitting device includes a stacked body.
- the stacked body includes an active layer and a first semiconductor layer and a second semiconductor layer that sandwich the active layer.
- the light emitting device further includes a current confinement layer having an opening, a concave first reflecting mirror on the first semiconductor layer side, and a second reflecting mirror on the second semiconductor layer side, sandwiching the stacked body and the opening.
- a vertical resonator is further disposed between the first reflecting layer disposed at a position facing the first reflecting mirror with a predetermined gap between the first reflecting mirror and the first reflecting layer, and the vertical resonator.
- a phosphor layer that converts the wavelength of light leaked from the light.
- the light emitting device includes a plurality of light emitting elements. Each light emitting element has the same components as the above light emitting element.
- the first semiconductor layer-side reflecting mirror (first reflecting mirror) is concave. Thereby, the light leaking from the first reflecting mirror spreads by the concave first reflecting mirror.
- the first reflecting layer is provided at a position facing the first reflecting mirror with a predetermined gap therebetween, and the first reflecting mirror and the first reflecting mirror are provided.
- a phosphor layer is provided between the layers. Thereby, the light leaking from the first reflecting mirror enters the phosphor layer with a wide radiation angle.
- the light reflected from the first reflecting layer is the light leaking from the first reflecting mirror in the phosphor layer.
- the incident light is incident on a different location from the passing location.
- the uniformity of the intensity distribution of the light emitted from the phosphor layer is improved as compared with the case where the light leaked from the first reflecting mirror enters the phosphor layer with a narrow wide radiation angle. That is, the uniformity of the intensity distribution of the light emitted from the phosphor layer is improved without separating the phosphor layer from the first reflecting mirror.
- the uniformity of the intensity distribution of light emitted from the phosphor layer is improved without the phosphor layer being far away from the first reflecting mirror. Therefore, the element can be reduced in size.
- the effect of this indication is not necessarily limited to the effect described here, Any effect described in this specification may be sufficient.
- FIG. 7 is a diagram illustrating a modification of the cross-sectional configuration of the light emitting element of FIG. 6. It is a figure showing the cross-sectional structural example of the light emitting element which concerns on 3rd Embodiment of this indication. It is a figure which represents typically the mode of the light emission in the light emitting element of FIG. It is a figure which represents typically the mode of the light emission in the light emitting element of FIG.
- FIG. 11 is a diagram illustrating a modification of the cross-sectional configuration of the light emitting element of FIG. 10. It is a figure showing the cross-sectional structural example of the light emitting element which concerns on 4th Embodiment of this indication.
- FIG. 15 is a diagram illustrating a modification of the cross-sectional configuration of the light emitting element of FIG. 14. It is a figure showing the cross-sectional structural example of the light emitting element which concerns on 5th Embodiment of this indication. It is a figure which represents typically the mode of the light emission in the light emitting element of FIG. It is a figure which represents typically the mode of the light emission in the light emitting element of FIG. It is a figure showing the modification of the cross-sectional structure of the light emitting element of FIG.
- First embodiment (light emitting device) 2. Modified example of first embodiment (light emitting element) 3. Second embodiment (light emitting device) 4). Modified example of second embodiment (light emitting device) 5). Third Embodiment (Light Emitting Element) 6). Modified example of the third embodiment (light emitting device) 7). Fourth embodiment (light emitting device) 8). Modified example of the fourth embodiment (light emitting device) 9. Fifth embodiment (light emitting device) 10. Modified example of the fifth embodiment (light emitting device) 11. Sixth embodiment (light emitting device) 12 Seventh embodiment (light emitting device)
- FIG. 1 illustrates a cross-sectional configuration example of the light emitting element 10.
- the light-emitting element 10 is a top emission type semiconductor laser that can be suitably applied to thin applications that require low power consumption, thin applications that require a large area, and the like.
- the light emitting element 10 includes a vertical resonator.
- the vertical resonator is configured to oscillate at a predetermined oscillation wavelength ⁇ 0 by two DBRs (distributed Bragg reflectors) facing each other in the normal direction of the substrate 11 described later.
- the vertical resonator is composed of two DBR layers that sandwich a substrate 11, a laminate 12 described later, and an opening 13A of a current confinement layer 13 described later. That is, the substrate 11 is a substrate provided inside the vertical resonator.
- the two DBR layers are composed of a DBR layer 17 (first reflecting mirror) on the semiconductor layer 12a side described later and a DBR layer 16 (second reflecting mirror) on the semiconductor layer 12c side described later.
- the DBR layer 17 is formed in contact with the back surface of the substrate 11.
- the stacked body 12 includes, for example, an active layer 12b and two semiconductor layers that sandwich the active layer 12b.
- the two semiconductor layers are composed of a semiconductor layer 12a near the substrate 11 and a semiconductor layer 12c separated from the substrate 11.
- the light emitting element 10 includes, for example, a semiconductor layer 12a, an active layer 12b, a semiconductor layer 12c, a current confinement layer 13, an electrode layer 14, an electrode pad 15, and a DBR layer 16 in this order from the substrate 11 side on a substrate 11. Yes.
- the light emitting element 10 further includes, for example, a DBR layer 17, a reflective layer 18, a phosphor layer 19, a reflector 21, and a reflective layer 22 on the back side of the substrate 11.
- the stacked body 12 may have, for example, a contact layer on the outermost surface on the semiconductor layer 12c side for bringing the semiconductor layer 12c and the electrode layer 14 into ohmic contact with each other.
- the contact layer may be a layer formed by doping a high-concentration impurity with respect to the outermost surface of the semiconductor layer 12c, or may be formed on the outermost surface of the semiconductor layer 12c formed separately from the semiconductor layer 12c. It may be a layer in contact.
- the DBR layer 16 corresponds to a specific example of “second reflecting mirror” of the present disclosure.
- the DBR layer 17 corresponds to a specific example of “first reflecting mirror” of the present disclosure.
- the reflective layer 18 corresponds to a specific example of “second reflective layer” of the present disclosure.
- the reflector 21 corresponds to a specific example of “third reflective layer” of the present disclosure.
- the reflective layer 22 corresponds to a specific example of “first reflective layer” of the present disclosure.
- the substrate 11 is a crystal growth substrate used when epitaxially growing the stacked body 12.
- the substrate 11 and the laminate 12 are made of a gallium nitride based semiconductor.
- the substrate 11 is, for example, a GaN substrate.
- the stacked body 12 is made of, for example, GaN, AlGaN, AlInN, GaInN, AlGaInN, or the like.
- the semiconductor layer 12a is made of, for example, GaN.
- the semiconductor layer 12a includes, for example, silicon (Si) as an n-type impurity. That is, the semiconductor layer 12a is an n-type semiconductor layer.
- the semiconductor layer 12c is made of, for example, GaN.
- the semiconductor layer 12c contains, for example, magnesium (Mg), zinc (Zn), etc.
- the semiconductor layer 12c is a p-type semiconductor layer.
- the active layer 12b has, for example, a quantum well structure.
- a quantum well structure As a kind of quantum well structure, a single quantum well structure (QW structure) or a multiple quantum well structure (MQW structure) is mentioned, for example.
- the quantum well structure has a structure in which well layers and barrier layers are alternately stacked.
- As a combination of the well layer and the barrier layer for example, (In y Ga (1-y) N, GaN), (In y Ga (1-y) N, In z Ga (1-z) N) [where, y> z], (In y Ga (1-y) N, AlGaN), and the like.
- the current confinement layer 13 is a layer for constricting the current injected into the active layer 12b.
- the current confinement layer 13 is configured by, for example, an insulating layer having an opening 13A.
- the insulating layer for example, is formed in contact with the outermost surface of the laminate 12, for example, it is constituted by an inorganic material such as SiO 2.
- the insulating layer may be constituted by a high resistance region formed by injecting impurities into the stacked body 12 from the semiconductor layer 12c side of the stacked body 12.
- the light emitting element 10 may have a function equivalent to that of the current confinement layer 13 instead of the current confinement layer 13.
- the light emitting element 10 may include, for example, a contact layer having a size equivalent to that of the opening 13A between the semiconductor layer 12c and the electrode layer 14. Such a contact layer is formed, for example, by forming a contact layer over the entire surface of the semiconductor layer 12c and then selectively etching it by the RIE (Reactive Ion Etching) method or the like. By providing such a contact layer, current confinement can be performed.
- the light emitting element 10 may have, for example, an annular oxidized region formed by partially oxidizing a part of the stacked body 12 from the lateral direction. By providing such an oxide region, current confinement can be performed.
- the opening 13A has, for example, a circular shape. The diameter of the opening 13A is, for example, about 10 ⁇ m.
- the electrode layer 14 is in contact with the surface of the stacked body 12 exposed at the bottom surface of the opening 13A of the current confinement layer 13.
- the electrode layer 14 is made of, for example, a transparent conductive material. Examples of the transparent conductive material used for the electrode layer 14 include ITO (Indium Tin Oxide).
- the electrode pad 15 is electrically connected to an external electrode or circuit, and is electrically connected to the electrode layer 14. For example, the electrode pad 15 is in contact with a portion of the electrode layer 14 that is not opposed to the opening 13A.
- the electrode pad 15 is made of, for example, Pd / Ti / Pt / Au, Ti / Pd / Au, Ti / Ni / Au, or the like.
- the light-emitting element 10 includes an electrode electrically connected to the semiconductor layer 12a in addition to the electrode layer 14 as an electrode for injecting current into the active layer 12b. This electrode is not illustrated in the drawings.
- the DBR layers 16 and 17 are each composed of, for example, a dielectric multilayer film.
- the dielectric multilayer film has a structure in which low refractive index layers and high refractive index layers are alternately stacked.
- Examples of the material for the dielectric multilayer film constituting the DBR layers 16 and 17 include SiO 2 , SiN, Al 2 O 3 , Nb 2 O 5 , Ta 2 O 5 , TiO 2 , AlN, MgO, and ZrO 2. It is done.
- examples of the combination of the low refractive index layer and the high refractive index layer include SiO 2 / SiN, SiO 2 / Nb 2 O 5 , SiO 2 / ZrO 2 , SiO 2 / AlN, SiO 2 / Ta 2 O 5 and the like.
- the dielectric multilayer film constituting the DBR layers 16 and 17 is formed by a film forming method such as sputtering, CVD, or vapor deposition.
- the substrate 11 has a protruding portion 11A that protrudes on the opposite side to the laminated body 12 on the back surface.
- the surface of the protrusion 11 ⁇ / b> A has a convex shape that protrudes to the opposite side of the stacked body 12. It is preferable that the curvature radius of the surface of the protrusion 11A is larger than the resonator length in the vertical resonator. This is because when the radius of curvature of the surface of the protruding portion 11A is equal to or less than the resonator length of the vertical resonator, the optical field confinement becomes excessive and light loss is likely to occur.
- the DBR layer 17 is formed following the surface of the protruding portion 11A and functions as a concave (or concave curved surface) reflecting mirror for the vertical resonator.
- the diameter of the protruding portion 11A is, for example, about 40 ⁇ m.
- the DBR layer 16 is formed following the surface of the electrode layer 14 and is formed in contact with the surface of the electrode layer 14. In the DBR layer 16, a portion of the DBR layer 16 that faces the opening 13A is substantially flat.
- the active layer 12 b is preferably arranged closer to the DBR layer 16 and the current confinement layer 13 than the DBR layer 17. This is because the optical field confinement in the active layer 12b is strengthened and laser oscillation is facilitated.
- the shortest distance DCI from the center of gravity of the area of the current confinement layer 13 to the inner edge of the opening 13A satisfies the following expression.
- the region where the light reflected by the DBR layer 17 is collected is included in the region where the active layer 12b has gain by current injection, and stimulated emission of light from the carrier is promoted, and laser oscillation This is because it becomes easy.
- the derivation of the following equation is disclosed in, for example, H. Kogelnik and T. Li, “Laser Beams and Resonators”, Applied Optics / Vol. 5, No. 10 / October 1966. ⁇ 0 is also called a beam waist radius.
- the reflection layer 18 is formed following the surface of the DBR layer 17 and is formed in contact with the surface of the DBR layer 17.
- the reflective layer 18 is disposed between the DBR layer 17 and the phosphor layer 19.
- the reflective layer 18 reflects light (yellow light Ly described later) generated by wavelength conversion by the phosphor layer 19.
- the reflective layer 18 is made of, for example, a dielectric multilayer film.
- the phosphor layer 19 is disposed between the DBR layer 17 and the reflective layer 22.
- the phosphor layer 19 is in contact with the reflective layer 18.
- the phosphor layer 19 converts the wavelength of light leaking from the DBR layer 17 (that is, the vertical resonator).
- the phosphor layer 19 is a part of the light (blue light Lb) leaked from the DBR layer 17 (that is, the vertical resonator) out of the blue light Lb generated in the active layer 12 b. Part is absorbed and yellow light Ly is generated.
- the phosphor layer 19 includes light (blue light Lb) leaked from the DBR layer 17 (that is, the vertical resonator) among the blue light Lb generated in the active layer 12 b. May be absorbed to generate white light Lw.
- the reflector 21 is formed so as to cover the side surface of the phosphor layer 19 and not to cover a portion of the reflecting surface 22A facing the opening 13A.
- the reflector 21 is a heat radiating body made of a material containing metal such as aluminum, and releases heat generated in the phosphor layer 19 to the outside through the reflector 21.
- the reflector 21 is formed, for example, in contact with the back surface of the substrate 11 and covers, for example, not only the side surface of the phosphor layer 19 but also the side surfaces of the DBR layer 17 and the reflection layer 18.
- the reflective layer 22 is disposed at a position facing the DBR layer 17 with a predetermined gap.
- the reflective layer 22 has a reflective surface 22 ⁇ / b> A that does not follow the surface shape of the DBR layer 17.
- the reflection surface 22A is a plane having a normal line parallel to the normal line of the stacked body 12, for example.
- the reflection layer 22 has, for example, a reflectance with respect to light leaked from the DBR layer 17 (blue light Lb) rather than a reflectance with respect to light (yellow light Ly described later) generated by wavelength conversion by the phosphor layer 19.
- the reflective layer 22 transmits part of the light (yellow light Ly) generated by the wavelength conversion by the phosphor layer 19. Further, for example, as shown in FIG. 2, the reflective layer 22 reflects much of the light (blue light Lb) leaked from the DBR layer 17 and is scattered in the phosphor layer 19 at the same time. A part of the incident blue light Lb is transmitted. As a result, the reflective layer 22 emits white light Lw, which is a combined light of the blue light Lb and the yellow light Ly, to the outside.
- the reflection layer 22 transmits a part of the light (white light Lw) generated by the wavelength conversion by the phosphor layer 19 and leaks from the DBR layer 17. A large amount of (blue light Lb) may be reflected.
- the reflective layer 22 has a reflectance with respect to light (blue light Lb) leaked from the DBR layer 17 rather than a reflectance with respect to light (white light Lw) generated by wavelength conversion by the phosphor layer 19.
- the larger Bragg reflector is included.
- the reflection layer 22 emits light (white light Lw) generated by wavelength conversion by the phosphor layer 19 to the outside.
- the light wavelength-converted by the phosphor layer 19 is yellow light Ly, for example, as shown in FIG. 2, most of the light (blue light Lb) leaked from the DBR layer 17 is caused by the reflective layer 22. At the same time as being reflected, a part of the blue light Lb re-entered by being scattered in the phosphor layer 19 is transmitted through the reflection layer 22. As a result, white light Lw that is a combined light of the blue light Lb and the yellow light Ly is emitted from the reflection layer 22 to the outside.
- the light wavelength-converted by the phosphor layer 19 is the white light Lw, for example, as shown in FIG. 3, a part of the light (white light Lw) generated by the wavelength conversion by the phosphor layer 19 Passes through the reflective layer 22. As a result, light (white light Lw) generated by wavelength conversion by the phosphor layer 19 is emitted from the reflective layer 22 to the outside.
- a technique for converting the wavelength of light emitted from a surface emitting laser has been disclosed.
- a laser beam is spread by irradiating a phosphor with a laser beam through a thick transparent substrate, and further transparent by an optical film and one mirror of a vertical resonator formed so as to sandwich the transparent substrate.
- Wavelength conversion has been performed by reciprocating the laser beam through the substrate and uniformly irradiating the phosphor with the laser beam.
- it is necessary to provide a thick transparent substrate between the surface emitting laser and the phosphor it is not easy to reduce the size of the element.
- the DBR layer 17 is concave (or concave). Thereby, the light leaking from the DBR layer 17 (vertical resonator) is spread by the concave (or concave curved surface) DBR layer 17.
- the reflective layer 22 is provided at a position facing the DBR layer 17 with a predetermined gap, and the phosphor layer 19 is provided between the DBR layer 17 and the reflective layer 22. Yes. Thereby, the light leaked from the DBR layer 17 (vertical resonator) enters the phosphor layer 19 with a wide radiation angle.
- the light leaking from the DBR layer 17 (vertical resonator) is reflected obliquely by the reflective layer 22, the light reflected by the reflective layer 22 is the DBR layer 17 (vertical resonator) of the phosphor layer 19. ) Is incident on a location different from the location where the light leaked from. As a result, compared with the case where the light leaked from the DBR layer 17 (vertical resonator) enters the phosphor layer 19 with a narrow wide radiation angle, the intensity distribution of the light emitted from the phosphor layer 19 is more uniform. improves.
- the uniformity of the intensity distribution of the light emitted from the phosphor layer 19 is improved even if the phosphor layer 19 is not far from the DBR layer 17 (vertical resonator). Therefore, the element can be reduced in size. Further, it is possible to realize a white light-emitting element having a small color and a bright and stable color.
- the reflective layer 22 has a reflective surface 22A that does not follow the surface shape of the DBR layer 17.
- the reflection surface 22 ⁇ / b> A is a plane having a normal line parallel to the normal line of the stacked body 12.
- the intensity distribution of the light emitted from the phosphor layer 19 is more uniform. improves. That is, the uniformity of the intensity distribution of the light emitted from the phosphor layer 19 is improved even if the phosphor layer 19 is not far from the DBR layer 17 (vertical resonator). Therefore, the element can be reduced in size.
- the reflective layer 22 includes a Bragg reflector that has a greater reflectance with respect to the light leaking from the DBR layer 17 than the reflectance with respect to the light generated by the wavelength conversion by the phosphor layer 19.
- a Bragg reflector that has a greater reflectance with respect to the light leaking from the DBR layer 17 than the reflectance with respect to the light generated by the wavelength conversion by the phosphor layer 19.
- white light Lw which is a combined light of blue light Lb and yellow light Ly, can be emitted to the outside, or white light Lw generated by the phosphor layer 19 can be emitted to the outside.
- a reflective layer 18 is provided between the DBR layer 17 and the phosphor layer 19. Thereby, it can prevent that the light produced
- a reflector 21 is provided that covers the side surface of the phosphor layer 19 and that does not cover the portion of the reflecting surface 22A that faces the opening 13A.
- generated by wavelength conversion by the fluorescent substance layer 19 and the light reflected by the reflection layer 22 can be reflected toward the reflection layer 22 side.
- the light generated by the wavelength conversion by the phosphor layer 19 and the light reflected by the reflection layer 22 can be effectively used as an optical output to the outside.
- the reflector 21 is a heat radiator comprised with the material containing a metal, the heat which generate
- the phosphor layer 19 is in contact with the reflective layer 18. Thereby, it is possible to realize a white light emitting element having a small size and a bright and stable color.
- FIG. 4 illustrates a modification of the cross-sectional configuration of the light emitting element 10.
- the light emitting element 10 includes a resin layer 23 or an air layer 24 between the reflective layer 18 and the phosphor layer 19. That is, the phosphor layer 19 is disposed to face the reflective layer 18 with the resin layer 23 or the air layer 24 interposed therebetween.
- the resin layer 23 is made of, for example, polyimide. Even in this case, the element can be reduced in size. Further, it is possible to realize a white light-emitting element having a small color and a bright and stable color.
- FIG. 5 illustrates a modification of the cross-sectional configuration of the light emitting element 10.
- the reflector 21 is formed not only on the back surface of the substrate 11 but also on the surface of the end portion of the reflective layer 18.
- the size of the element in the width direction can be reduced.
- the heat generated in the phosphor layer 19 can be dissipated to the outside via the reflector 21 more quickly.
- FIG. 6 illustrates a cross-sectional configuration example of the light emitting element 20.
- the light emitting element 20 corresponds to the light emitting element 10 of the above-described embodiment, in which the reflective layer 18, the reflector 21, and the reflective layer 22 are omitted and a reflective layer 25 is provided instead. Therefore, in the present embodiment, the phosphor layer 19 is in contact with the DBR layer 17.
- the reflective layer 25 corresponds to specific examples of “first reflective layer” and “fourth reflective layer” of the present disclosure.
- the reflection layer 25 covers the side surface of the phosphor layer 19 and is formed so as to reflect the light leaking from the DBR layer 17 and the light generated by wavelength conversion by the phosphor layer 19 to the laminate 12 side. ing.
- the reflective layer 25 covers not only the side surface of the phosphor layer 19 but also the bottom surface.
- a portion of the reflective layer 25 that faces the bottom surface of the phosphor layer 19 has a reflective surface 25 ⁇ / b> A that does not follow the surface shape of the DBR layer 17.
- the reflection surface 25A is a plane having a normal line parallel to the normal line of the stacked body 12, for example.
- the reflective layer 25 is a heat radiating body made of a material containing metal such as aluminum, and releases heat generated in the phosphor layer 19 to the outside through the reflective layer 25.
- the reflective layer 25 is formed, for example, in contact with the back surface of the substrate 11 and covers, for example, not only the side surface of the phosphor layer 19 but also the side surface of the DBR layer 17.
- the reflection layer 25 reflects, for example, light (yellow light Ly or white light Lw) generated by wavelength conversion by the phosphor layer 19 and also reflects light (blue light Lb) leaking from the DBR layer 17. Thereby, the reflective layer 25 reflects the light (yellow light Ly or white light Lw) generated by the wavelength conversion by the phosphor layer 19 to the laminated body 12 side as shown in FIGS. . The reflection layer 25 further reflects light (blue light Lb) leaked from the DBR layer 17 to the laminated body 12 side and simultaneously scatters in the phosphor layer 19 as shown in FIGS. The blue light Lb that is reincident due to the reflection is reflected to the laminated body 12 side.
- the light (blue light Lb and yellow light Ly) reflected by the reflective layer 25 becomes white light Lw that is a combined light of the blue light Lb and the yellow light Ly, as shown in FIG.
- the light is emitted from the periphery of the DBR layer 16 to the outside.
- the white light Lw generated in the phosphor layer 19 is emitted to the outside from the peripheral edge of the DBR layer 16, for example.
- the emission of the white light Lw to the outside is not limited to the periphery of the DBR layer 16.
- the electrode pad 15 may be provided with an opening, and the white light Lw may be emitted from the opening.
- the DBR layer 17 is concave (or concave). Thereby, the light leaking from the DBR layer 17 (vertical resonator) is spread by the concave (or concave curved surface) DBR layer 17.
- the reflective layer 25 is provided at a position facing the DBR layer 17 with a predetermined gap, and the phosphor layer 19 is provided between the DBR layer 17 and the reflective layer 25. Yes. Thereby, the light leaked from the DBR layer 17 (vertical resonator) enters the phosphor layer 19 with a wide radiation angle.
- the light reflected by the reflective layer 25 is the DBR layer 17 (vertical resonator) of the phosphor layer 19.
- the intensity distribution of the light emitted from the phosphor layer 19 is more uniform. improves.
- the uniformity of the intensity distribution of the light emitted from the phosphor layer 19 is improved even if the phosphor layer 19 is not far from the DBR layer 17 (vertical resonator). Therefore, the element can be reduced in size. Further, it is possible to realize a white light-emitting element having a small color and a bright and stable color.
- the reflective layer 25 has a reflective surface 25A that does not follow the surface shape of the DBR layer 17.
- the reflection surface 25 ⁇ / b> A is a plane having a normal line parallel to the normal line of the stacked body 12.
- the intensity distribution of the light emitted from the phosphor layer 19 is more uniform. improves. That is, the uniformity of the intensity distribution of the light emitted from the phosphor layer 19 is improved even if the phosphor layer 19 is not far from the DBR layer 17 (vertical resonator). Therefore, the element can be reduced in size.
- the reflective layer 25 is a heat radiator made of a material containing metal
- the heat generated in the phosphor layer 19 can be dissipated to the outside through the reflective layer 25. it can.
- a decrease in conversion efficiency of the phosphor layer 19 due to heat storage can be suppressed.
- the phosphor layer 19 is in contact with the DBR layer 17. Thereby, it is possible to realize a white light emitting element having a small size and a bright and stable color.
- FIG. 9 illustrates a modification of the cross-sectional configuration of the light emitting element 20.
- the light emitting element 20 includes a resin layer 23 or an air layer 24 between the DBR layer 17 and the phosphor layer 19. That is, the phosphor layer 19 is disposed to face the DBR layer 17 with the resin layer 23 or the air layer 24 interposed therebetween. Even in this case, the element can be reduced in size as in the second embodiment. Further, it is possible to realize a white light-emitting element having a small color and a bright and stable color.
- FIG. 10 illustrates a cross-sectional configuration example of the light emitting element 30.
- the light emitting element 30 corresponds to the light emitting element 20 of the second embodiment, in which the reflective layer 25 is omitted and a reflective layer 26 is provided instead. Further, the light emitting element 30 is configured to be able to output light from the side surface of the phosphor layer 19.
- the reflective layer 26 corresponds to a specific example of “first reflective layer” of the present disclosure.
- the reflection layer 26 covers the bottom surface of the phosphor layer 19 and is formed so as to reflect the light leaking from the DBR layer 17 and the light generated by the wavelength conversion by the phosphor layer 19 to the laminate 12 side. ing.
- a portion of the reflective layer 26 that faces the bottom surface of the phosphor layer 19 has a reflective surface 26 ⁇ / b> A that does not follow the surface shape of the DBR layer 17.
- the reflection surface 26 ⁇ / b> A is a plane having a normal line parallel to the normal line of the stacked body 12, for example.
- the reflective layer 26 may be a heat radiator made of a material containing a metal such as aluminum, for example. In this case, the reflective layer 26 releases the heat generated in the phosphor layer 19 to the outside through the reflective layer 26.
- the reflective layer 26 is formed in contact with the bottom surface of the phosphor layer 19.
- the reflective layer 26 reflects, for example, light (yellow light Ly or white light Lw) generated by wavelength conversion by the phosphor layer 19 and also emits light (blue light Lb) leaking from the DBR layer 17. Thereby, the reflection layer 26 reflects the light (yellow light Ly or white light Lw) generated by the wavelength conversion by the phosphor layer 19 to the laminated body 12 side as shown in FIGS. 11 and 12, for example. . The reflection layer 26 further reflects light (blue light Lb) leaked from the DBR layer 17 to the laminated body 12 side, and simultaneously scatters in the phosphor layer 19 as shown in FIGS. The blue light Lb that is reincident due to the reflection is reflected to the laminated body 12 side.
- the light (blue light Lb and yellow light Ly) reflected by the reflective layer 26 becomes white light Lw that is a combined light of the blue light Lb and the yellow light Ly.
- the light is emitted from the periphery of the DBR layer 16 to the outside.
- the white light Lw generated in the phosphor layer 19 is emitted to the outside from the periphery of the DBR layer 16, for example.
- the light (blue light Lb and yellow light Ly) reflected by the reflective layer 26 propagates in the phosphor layer 19 to generate the blue light Lb and the yellow light Ly.
- the white light Lw that is the combined light is emitted from the end face of the phosphor layer 19 to the outside.
- the light (white light Lw) reflected by the reflective layer 26 propagates through the phosphor layer 19 and exits from the end face of the phosphor layer 19 to the outside.
- the DBR layer 17 is concave (or concave). Thereby, the light leaking from the DBR layer 17 (vertical resonator) is spread by the concave (or concave curved surface) DBR layer 17.
- the reflective layer 26 is provided at a position facing the DBR layer 17 with a predetermined gap, and the phosphor layer 19 is provided between the DBR layer 17 and the reflective layer 26. Yes. Thereby, the light leaked from the DBR layer 17 (vertical resonator) enters the phosphor layer 19 with a wide radiation angle.
- the light leaking from the DBR layer 17 (vertical resonator) is reflected obliquely by the reflective layer 26, the light reflected by the reflective layer 26 is the DBR layer 17 (vertical resonator) of the phosphor layer 19. ) Is incident on a location different from the location where the light leaked from. As a result, compared with the case where the light leaked from the DBR layer 17 (vertical resonator) enters the phosphor layer 19 with a narrow wide radiation angle, the intensity distribution of the light emitted from the phosphor layer 19 is more uniform. improves.
- the uniformity of the intensity distribution of the light emitted from the phosphor layer 19 is improved even if the phosphor layer 19 is not far from the DBR layer 17 (vertical resonator). Therefore, the element can be reduced in size. Further, it is possible to realize a white light-emitting element having a small color and a bright and stable color.
- the reflective layer 26 has a reflective surface 26A that does not follow the surface shape of the DBR layer 17.
- the reflection surface 26 ⁇ / b> A is a plane having a normal line parallel to the normal line of the stacked body 12.
- the intensity distribution of the light emitted from the phosphor layer 19 is more uniform. improves. That is, the uniformity of the intensity distribution of the light emitted from the phosphor layer 19 is improved even if the phosphor layer 19 is not far from the DBR layer 17 (vertical resonator). Therefore, the element can be reduced in size.
- the light emitting element 30 is configured to be able to output light from the side surface of the phosphor layer 19. As a result, more light can be extracted, and thus a white light-emitting element having a small size and a bright and stable color can be realized.
- the phosphor layer 19 is in contact with the DBR layer 17. Thereby, it is possible to realize a white light emitting element having a small size and a bright and stable color.
- the reflective layer 26 is a heat radiator made of a material containing a metal
- the heat generated in the phosphor layer 19 can be dissipated to the outside through the reflective layer 26. it can.
- a decrease in conversion efficiency of the phosphor layer 19 due to heat storage can be suppressed.
- FIG. 13 illustrates a modification of the cross-sectional configuration of the light emitting element 30.
- the light emitting element 30 includes a resin layer 23 or an air layer 24 between the DBR layer 17 and the phosphor layer 19. That is, the phosphor layer 19 is disposed to face the DBR layer 17 with the resin layer 23 or the air layer 24 interposed therebetween. Even in this case, the element can be miniaturized as in the third embodiment. Further, it is possible to realize a white light-emitting element having a small color and a bright and stable color.
- FIG. 14 illustrates a cross-sectional configuration example of the light emitting element 40.
- the light emitting element 40 corresponds to the light emitting element 10 of the first embodiment in which the reflector 21 and the reflective layer 22 are omitted and a reflective layer 26 is provided instead. Further, the light emitting element 40 is configured to be able to output light from the side surface of the phosphor layer 19.
- the reflection layer 26 covers the bottom surface of the phosphor layer 19 and is formed so as to reflect the light leaking from the DBR layer 17 and the light generated by the wavelength conversion by the phosphor layer 19 to the laminate 12 side. ing.
- a portion of the reflective layer 26 that faces the bottom surface of the phosphor layer 19 has a reflective surface 26 ⁇ / b> A that does not follow the surface shape of the DBR layer 17.
- the reflection surface 26 ⁇ / b> A is a plane having a normal line parallel to the normal line of the stacked body 12, for example.
- the reflective layer 26 may be a heat radiator made of a material containing a metal such as aluminum, for example. In this case, the reflective layer 26 releases the heat generated in the phosphor layer 19 to the outside through the reflective layer 26.
- the reflective layer 26 is formed in contact with the bottom surface of the phosphor layer 19.
- the reflection layer 26 reflects, for example, light (yellow light Ly or white light Lw) generated by wavelength conversion by the phosphor layer 19 and also reflects light (blue light Lb) leaking from the DBR layer 17.
- the reflective layer 26 reflects light (yellow light Ly or white light Lw) generated by wavelength conversion by the phosphor layer 19 to the laminated body 12 side.
- the reflective layer 26 reflects light (blue light Lb) leaked from the DBR layer 17 toward the laminate 12 and simultaneously scatters in the phosphor layer 19. The blue light Lb that is reincident due to the reflection is reflected to the laminated body 12 side.
- the light (blue light Lb and yellow light Ly) reflected by the reflective layers 26 and 18 propagates in the phosphor layer 19, and the blue light Lb and yellow light are transmitted.
- the white light Lw which is a combined light with Ly, is emitted from the end face of the phosphor layer 19 to the outside.
- the light (white light Lw) reflected by the reflection layers 26 and 18 propagates in the phosphor layer 19 and is emitted to the outside from the end face of the phosphor layer 19. .
- the DBR layer 17 is concave (or concave). Thereby, the light leaking from the DBR layer 17 (vertical resonator) is spread by the concave (or concave curved surface) DBR layer 17.
- the reflective layer 26 is provided at a position facing the DBR layer 17 with a predetermined gap, and the phosphor layer 19 is provided between the DBR layer 17 and the reflective layer 26. Yes. Thereby, the light leaked from the DBR layer 17 (vertical resonator) enters the phosphor layer 19 with a wide radiation angle.
- the light reflected by the reflecting layer 26 is the DBR layer 17 (vertical resonator) of the phosphor layer 19.
- the intensity distribution of the light emitted from the phosphor layer 19 is more uniform. improves.
- the uniformity of the intensity distribution of the light emitted from the phosphor layer 19 is improved even if the phosphor layer 19 is not far from the DBR layer 17 (vertical resonator). Therefore, the element can be reduced in size. Further, it is possible to realize a white light-emitting element having a small color and a bright and stable color.
- the reflective layer 26 has a reflective surface 26A that does not follow the surface shape of the DBR layer 17.
- the reflection surface 26 ⁇ / b> A is a plane having a normal line parallel to the normal line of the stacked body 12.
- the intensity distribution of the light emitted from the phosphor layer 19 is more uniform than the case where the light leaked from the DBR layer 17 (vertical resonator) enters the phosphor layer 19 with a narrow wide radiation angle. improves. That is, the uniformity of the intensity distribution of the light emitted from the phosphor layer 19 is improved even if the phosphor layer 19 is not far from the DBR layer 17 (vertical resonator). Therefore, the element can be reduced in size.
- the phosphor layer 19 is in contact with the reflective layer 18. Thereby, it is possible to realize a white light emitting element having a small size and a bright and stable color.
- the reflective layer 26 is a heat radiator made of a material containing a metal
- the heat generated in the phosphor layer 19 can be dissipated to the outside through the reflective layer 26. it can.
- a decrease in conversion efficiency of the phosphor layer 19 due to heat storage can be suppressed.
- FIG. 17 illustrates a modification of the cross-sectional configuration of the light emitting element 40.
- the light emitting element 40 includes a resin layer 23 or an air layer 24 between the reflective layer 18 and the phosphor layer 19. That is, the phosphor layer 19 is disposed to face the reflective layer 18 with the resin layer 23 or the air layer 24 interposed therebetween. Even in this case, the element can be reduced in size as in the fourth embodiment. Further, it is possible to realize a white light-emitting element having a small color and a bright and stable color.
- FIG. 18 illustrates a cross-sectional configuration example of the light emitting element 50.
- the light emitting element 50 corresponds to the light emitting element 40 of the fourth embodiment in which the reflective layer 26 is omitted and the reflective layer 22 is provided instead. Further, the light emitting element 50 is configured to be able to output light from the side surface of the phosphor layer 19.
- the reflective layer 22 is disposed at a position facing the DBR layer 17 with a predetermined gap.
- the reflective layer 22 has a reflective surface 22 ⁇ / b> A that does not follow the surface shape of the DBR layer 17.
- the reflection surface 22A is a plane having a normal line parallel to the normal line of the stacked body 12, for example.
- the reflection layer 22 has, for example, a reflectance with respect to light leaked from the DBR layer 17 (blue light Lb) rather than a reflectance with respect to light (yellow light Ly described later) generated by wavelength conversion by the phosphor layer 19.
- the reflective layer 22 transmits part of the light (yellow light Ly) generated by the wavelength conversion by the phosphor layer 19. Further, for example, as shown in FIG. 19, the reflective layer 22 reflects much of the light (blue light Lb) leaked from the DBR layer 17 and is scattered within the phosphor layer 19 at the same time. A part of the incident blue light Lb is transmitted. As a result, the reflective layer 22 emits white light Lw, which is a combined light of the blue light Lb and the yellow light Ly, to the outside. Further, for example, as shown in FIG. 19, the light (blue light Lb and yellow light Ly) reflected by the reflective layers 22 and 18 propagates in the phosphor layer 19, and the blue light Lb and the yellow light Ly are transmitted. The white light Lw, which is the combined light with the light, is emitted from the end face of the phosphor layer 19 to the outside.
- the reflective layer 22 transmits part of light (white light Lw) generated by wavelength conversion by the phosphor layer 19 and light leaked from the DBR layer 17.
- a large amount of (blue light Lb) may be reflected.
- the reflective layer 22 has a reflectance with respect to light (blue light Lb) leaked from the DBR layer 17 rather than a reflectance with respect to light (white light Lw) generated by wavelength conversion by the phosphor layer 19.
- the larger Bragg reflector is included.
- the reflection layer 22 emits light (white light Lw) generated by wavelength conversion by the phosphor layer 19 to the outside.
- the light (white light Lw) reflected by the reflection layers 22 and 18 propagates in the phosphor layer 19 and is emitted to the outside from the end face of the phosphor layer 19. .
- the DBR layer 17 is concave (or concave). Thereby, the light leaking from the DBR layer 17 (vertical resonator) is spread by the concave (or concave curved surface) DBR layer 17.
- the reflective layer 22 is provided at a position facing the DBR layer 17 with a predetermined gap, and the phosphor layer 19 is provided between the DBR layer 17 and the reflective layer 22. Yes. Thereby, the light leaked from the DBR layer 17 (vertical resonator) enters the phosphor layer 19 with a wide radiation angle.
- the light leaking from the DBR layer 17 (vertical resonator) is reflected obliquely by the reflective layer 22, the light reflected by the reflective layer 22 is the DBR layer 17 (vertical resonator) of the phosphor layer 19. ) Is incident on a location different from the location where the light leaked from. As a result, compared with the case where the light leaked from the DBR layer 17 (vertical resonator) enters the phosphor layer 19 with a narrow wide radiation angle, the intensity distribution of the light emitted from the phosphor layer 19 is more uniform. improves.
- the uniformity of the intensity distribution of the light emitted from the phosphor layer 19 is improved even if the phosphor layer 19 is not far from the DBR layer 17 (vertical resonator). Therefore, the element can be reduced in size. Further, it is possible to realize a white light-emitting element having a small color and a bright and stable color.
- the reflective layer 22 has a reflective surface 22A that does not follow the surface shape of the DBR layer 17.
- the reflection surface 22 ⁇ / b> A is a plane having a normal line parallel to the normal line of the stacked body 12.
- the intensity distribution of the light emitted from the phosphor layer 19 is more uniform. improves. That is, the uniformity of the intensity distribution of the light emitted from the phosphor layer 19 is improved even if the phosphor layer 19 is not far from the DBR layer 17 (vertical resonator). Therefore, the element can be reduced in size.
- the phosphor layer 19 is in contact with the reflective layer 18. Thereby, it is possible to realize a white light emitting element having a small size and a bright and stable color.
- FIG. 21 shows a modification of the cross-sectional configuration of the light emitting element 50.
- the light emitting element 50 includes a resin layer 23 or an air layer 24 between the reflective layer 18 and the phosphor layer 19. That is, the phosphor layer 19 is disposed to face the reflective layer 18 with the resin layer 23 or the air layer 24 interposed therebetween. Even in this case, the element can be reduced in size as in the fifth embodiment. Further, it is possible to realize a white light-emitting element having a small color and a bright and stable color.
- FIG. 22 illustrates a cross-sectional configuration example of the light emitting device 60.
- the light emitting device 60 corresponds to a device including a plurality of the light emitting elements 10 according to the first embodiment.
- each light emitting element 10 is configured to be driven independently of each other, for example.
- the electrode pads 15 of each light emitting element 10 are electrically separated from each other.
- FIG. 23 illustrates a cross-sectional configuration example of the light emitting device 70.
- the light emitting device 70 corresponds to a device including a plurality of the light emitting elements 20 of the second embodiment.
- each light emitting element 20 is configured to be driven independently of each other, for example.
- the electrode pads 15 of each light emitting element 20 are electrically separated from each other.
- this indication can take the following composition.
- a stacked body including an active layer, and a first semiconductor layer and a second semiconductor layer sandwiching the active layer; A current confinement layer having an opening; A concave first reflecting mirror on the side of the first semiconductor layer and a second reflecting mirror on the side of the second semiconductor layer, sandwiching the stacked body and the opening, A first reflective layer disposed at a position facing the first reflective mirror via a predetermined gap; A light emitting device comprising: a phosphor layer that is disposed between the first reflecting mirror and the first reflecting layer and converts the wavelength of light leaking from the first reflecting mirror.
- the light emitting element according to (2) wherein the reflection surface is a plane having a normal line parallel to a normal line of the stacked body.
- the first reflective layer includes a Bragg reflector that has a greater reflectivity for light leaking from the first reflector than the reflectivity for light generated by wavelength conversion by the phosphor layer. (1) Thru
- the light emitting element as described in. (7)
- the side surface of the phosphor layer is covered, and the light leaking from the first reflecting mirror together with the first reflecting layer and the light generated by wavelength conversion by the phosphor layer are reflected to the laminate side.
- the light emitting device according to any one of (1) to (3), further including a formed fourth reflective layer.
- the phosphor layer is disposed to face the second reflective layer via a resin layer or an air layer.
- each of the light emitting elements is A stacked body including an active layer, and a first semiconductor layer and a second semiconductor layer sandwiching the active layer; A current confinement layer having an opening; A concave first reflecting mirror on the side of the first semiconductor layer and a second reflecting mirror on the side of the second semiconductor layer, sandwiching the stacked body and the opening, A first reflective layer disposed at a position facing the first reflective mirror via a predetermined gap;
- a light emitting device comprising: a phosphor layer that is disposed between the first reflecting mirror and the first reflecting layer and converts the wavelength of light leaking from the first reflecting mirror.
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Abstract
Description
1.第1の実施の形態(発光素子)
2.第1の実施の形態の変形例(発光素子)
3.第2の実施の形態(発光素子)
4.第2の実施の形態の変形例(発光素子)
5.第3の実施の形態(発光素子)
6.第3の実施の形態の変形例(発光素子)
7.第4の実施の形態(発光素子)
8.第4の実施の形態の変形例(発光素子)
9.第5の実施の形態(発光素子)
10.第5の実施の形態の変形例(発光素子)
11.第6の実施の形態(発光装置)
12.第7の実施の形態(発光装置)
[構成]
本開示の第1の実施の形態に係る発光素子10の構成について説明する。図1は、発光素子10の断面構成例を表したものである。
但し、
ω0 2≡(λ0/π){LOR(RDBR-LOR)}1/2
ここで、
λ0:発振波長
LOR:共振器長
RDBR:DBR層17の曲率半径(=突出部11Aの表面の曲率半径)
このような構成の発光素子10では、半導体層12cと電気的に接続された電極層14と、半導体層12aと電気的に接続された電極層との間に所定の電圧が印加されると、開口部13Aを通して活性層12bに電流が注入され、これにより電子と正孔の再結合による発光が生じる。この光は、一対のDBR層16およびDBR層17により反射され、所定の発振波長λ0でレーザ発振が生じる。そして、DBR層17から漏れ出た光(青色光Lb)の一部が蛍光体層19によって波長変換される。
次に、本実施の形態に係る発光素子10での効果について説明する。
次に、第1の実施の形態の発光素子10の変形例について説明する。
図4は、発光素子10の断面構成の一変形例を表したものである。本変形例では、発光素子10は、反射層18と蛍光体層19との間に、樹脂層23または空気層24を備えている。つまり、蛍光体層19は、樹脂層23または空気層24を介して反射層18と対向配置されている。樹脂層23は、例えば、ポリイミドなどにより構成されている。このようにした場合であっても、素子を小型化することができる。また、小型でありながら、明るく安定した色の白色発光素子を実現することができる。
図5は、発光素子10の断面構成の一変形例を表したものである。本変形例では、反射体21が基板11の裏面だけでなく、反射層18の端部の表面にも接して形成されている。このようにした場合には、素子の幅方向の大きさを小さくすることができる。また、蛍光体層19の幅方向の大きさが小さくなるので、蛍光体層19で発生した熱をより一層、速やかに反射体21を介して外部に放散させることができる。
次に、本開示の第2の実施の形態に係る発光素子20について説明する。
図6は、発光素子20の断面構成例を表したものである。発光素子20は、上記実施の形態の発光素子10において、反射層18、反射体21および反射層22を省略し、その代わりに反射層25を備えたものに相当する。従って、本実施の形態では、蛍光体層19は、DBR層17に接している。反射層25は、本開示の「第1反射層」「第4反射層」の一具体例に対応する。
本実施の形態では、DBR層17が凹面状(または凹曲面状)となっている。これにより、DBR層17(垂直共振器)から漏れ出た光は、凹面状(または凹曲面状)のDBR層17によって広がる。また、本実施の形態では、DBR層17と所定の間隙を介して対向する位置に反射層25が設けられており、DBR層17と反射層25との間に蛍光体層19が設けられている。これにより、DBR層17(垂直共振器)から漏れ出た光は広放射角で蛍光体層19に入射する。さらに、DBR層17(垂直共振器)から漏れ出た光は反射層25で斜めに反射されるので、反射層25で反射された光が蛍光体層19のうち、DBR層17(垂直共振器)から漏れ出た光が通過した箇所とは異なる箇所に入射する。その結果、DBR層17(垂直共振器)から漏れ出た光が狭広放射角で蛍光体層19に入射した場合と比べて、蛍光体層19から放射される光の強度分布の均一性が向上する。つまり、蛍光体層19をDBR層17(垂直共振器)から遠く離さなくても、蛍光体層19から放射される光の強度分布の均一性が向上する。従って、素子を小型化することができる。また、小型でありながら、明るく安定した色の白色発光素子を実現することができる。
次に、第2の実施の形態の発光素子20の変形例について説明する。
図9は、発光素子20の断面構成の一変形例を表したものである。本変形例では、発光素子20は、DBR層17と蛍光体層19との間に、樹脂層23または空気層24を備えている。つまり、蛍光体層19は、樹脂層23または空気層24を介してDBR層17と対向配置されている。このようにした場合であっても、上記第2の実施の形態と同様、素子を小型化することができる。また、小型でありながら、明るく安定した色の白色発光素子を実現することができる。
次に、本開示の第3の実施の形態に係る発光素子30について説明する。
図10は、発光素子30の断面構成例を表したものである。発光素子30は、上記第2の実施の形態の発光素子20において、反射層25を省略し、その代わりに反射層26を備えたものに相当する。さらに、発光素子30は、蛍光体層19の側面から光出力ができるように構成されている。反射層26は、本開示の「第1反射層」の一具体例に対応する。
本実施の形態では、DBR層17が凹面状(または凹曲面状)となっている。これにより、DBR層17(垂直共振器)から漏れ出た光は、凹面状(または凹曲面状)のDBR層17によって広がる。また、本実施の形態では、DBR層17と所定の間隙を介して対向する位置に反射層26が設けられており、DBR層17と反射層26との間に蛍光体層19が設けられている。これにより、DBR層17(垂直共振器)から漏れ出た光は広放射角で蛍光体層19に入射する。さらに、DBR層17(垂直共振器)から漏れ出た光は反射層26で斜めに反射されるので、反射層26で反射された光が蛍光体層19のうち、DBR層17(垂直共振器)から漏れ出た光が通過した箇所とは異なる箇所に入射する。その結果、DBR層17(垂直共振器)から漏れ出た光が狭広放射角で蛍光体層19に入射した場合と比べて、蛍光体層19から放射される光の強度分布の均一性が向上する。つまり、蛍光体層19をDBR層17(垂直共振器)から遠く離さなくても、蛍光体層19から放射される光の強度分布の均一性が向上する。従って、素子を小型化することができる。また、小型でありながら、明るく安定した色の白色発光素子を実現することができる。
次に、第3の実施の形態の発光素子30の変形例について説明する。
図13は、発光素子30の断面構成の一変形例を表したものである。本変形例では、発光素子30は、DBR層17と蛍光体層19との間に、樹脂層23または空気層24を備えている。つまり、蛍光体層19は、樹脂層23または空気層24を介してDBR層17と対向配置されている。このようにした場合であっても、上記第3の実施の形態と同様、素子を小型化することができる。また、小型でありながら、明るく安定した色の白色発光素子を実現することができる。
次に、本開示の第4の実施の形態に係る発光素子40について説明する。
図14は、発光素子40の断面構成例を表したものである。発光素子40は、上記第1の実施の形態の発光素子10において、反射体21および反射層22を省略し、その代わりに反射層26を備えたものに相当する。さらに、発光素子40は、蛍光体層19の側面から光出力ができるように構成されている。
本実施の形態では、DBR層17が凹面状(または凹曲面状)となっている。これにより、DBR層17(垂直共振器)から漏れ出た光は、凹面状(または凹曲面状)のDBR層17によって広がる。また、本実施の形態では、DBR層17と所定の間隙を介して対向する位置に反射層26が設けられており、DBR層17と反射層26との間に蛍光体層19が設けられている。これにより、DBR層17(垂直共振器)から漏れ出た光は広放射角で蛍光体層19に入射する。さらに、DBR層17(垂直共振器)から漏れ出た光は射層26で斜めに反射されるので、反射層26で反射された光が蛍光体層19のうち、DBR層17(垂直共振器)から漏れ出た光が通過した箇所とは異なる箇所に入射する。その結果、DBR層17(垂直共振器)から漏れ出た光が狭広放射角で蛍光体層19に入射した場合と比べて、蛍光体層19から放射される光の強度分布の均一性が向上する。つまり、蛍光体層19をDBR層17(垂直共振器)から遠く離さなくても、蛍光体層19から放射される光の強度分布の均一性が向上する。従って、素子を小型化することができる。また、小型でありながら、明るく安定した色の白色発光素子を実現することができる。
次に、第4の実施の形態の発光素子20の変形例について説明する。
図17、発光素子40の断面構成の一変形例を表したものである。本変形例では、発光素子40は、反射層18と蛍光体層19との間に、樹脂層23または空気層24を備えている。つまり、蛍光体層19は、樹脂層23または空気層24を介して反射層18と対向配置されている。このようにした場合であっても、上記第4の実施の形態と同様、素子を小型化することができる。また、小型でありながら、明るく安定した色の白色発光素子を実現することができる。
次に、本開示の第5の実施の形態に係る発光素子50について説明する。
図18は、発光素子50の断面構成例を表したものである。発光素子50は、上記第4の実施の形態の発光素子40において、反射層26を省略し、その代わりに反射層22を備えたものに相当する。さらに、発光素子50は、蛍光体層19の側面から光出力ができるように構成されている。
本実施の形態では、DBR層17が凹面状(または凹曲面状)となっている。これにより、DBR層17(垂直共振器)から漏れ出た光は、凹面状(または凹曲面状)のDBR層17によって広がる。また、本実施の形態では、DBR層17と所定の間隙を介して対向する位置に反射層22が設けられており、DBR層17と反射層22との間に蛍光体層19が設けられている。これにより、DBR層17(垂直共振器)から漏れ出た光は広放射角で蛍光体層19に入射する。さらに、DBR層17(垂直共振器)から漏れ出た光は反射層22で斜めに反射されるので、反射層22で反射された光が蛍光体層19のうち、DBR層17(垂直共振器)から漏れ出た光が通過した箇所とは異なる箇所に入射する。その結果、DBR層17(垂直共振器)から漏れ出た光が狭広放射角で蛍光体層19に入射した場合と比べて、蛍光体層19から放射される光の強度分布の均一性が向上する。つまり、蛍光体層19をDBR層17(垂直共振器)から遠く離さなくても、蛍光体層19から放射される光の強度分布の均一性が向上する。従って、素子を小型化することができる。また、小型でありながら、明るく安定した色の白色発光素子を実現することができる。
次に、第5の実施の形態の発光素子50の変形例について説明する。
図21、発光素子50の断面構成の一変形例を表したものである。本変形例では、発光素子50は、反射層18と蛍光体層19との間に、樹脂層23または空気層24を備えている。つまり、蛍光体層19は、樹脂層23または空気層24を介して反射層18と対向配置されている。このようにした場合であっても、上記第5の実施の形態と同様、素子を小型化することができる。また、小型でありながら、明るく安定した色の白色発光素子を実現することができる。
次に、本開示の第6の実施の形態に係る発光装置60について説明する。
次に、本開示の第7の実施の形態に係る発光装置70について説明する。
(1)
活性層と、前記活性層を挟み込む第1半導体層および第2半導体層とを含む積層体と、
開口部を有する電流狭窄層と、
前記積層体および前記開口部を挟み込む、前記第1半導体層側の凹面状の第1反射鏡および前記第2半導体層側の第2反射鏡と、
前記第1反射鏡と所定の間隙を介して対向する位置に配置された第1反射層と、
前記第1反射鏡と前記第1反射層との間に配置され、前記第1反射鏡から漏れ出た光を波長変換する蛍光体層と
を備えた
発光素子。
(2)
前記第1反射層は、前記第1反射鏡の表面形状に倣わない反射面を有する
(1)に記載の発光素子。
(3)
前記反射面は、前記積層体の法線と平行な法線を有する平面である
(2)に記載の発光素子。
(4)
前記第1反射層は、前記蛍光体層による波長変換により生成された光に対する反射率よりも、前記第1反射鏡から漏れ出た光に対する反射率の方が大きいブラッグ反射鏡を含む
(1)ないし(3)のいずれか一項に記載の発光素子。
(5)
前記第1反射鏡と蛍光体層との間に配置され、前記蛍光体層による波長変換により生成された光を反射する第2反射層を更に備えた
(1)ないし(4)のいずれか一項に記載の発光素子。
(6)
前記蛍光体層の側面を覆うとともに、前記反射面のうち前記開口部と対向する箇所を覆わないように形成された第3反射層を更に備えた
(1)ないし(5)のいずれか一項に記載の発光素子。
(7)
前記第3反射層は、金属を含む材料で構成された放熱体である
(6)に記載の発光素子。
(8)
前記蛍光体層の側面を覆うとともに、前記第1反射層とともに前記第1反射鏡から漏れ出た光と、前記蛍光体層による波長変換により生成された光とを前記積層体側に反射するように形成された第4反射層を更に備えた
(1)ないし(3)のいずれか一項に記載の発光素子。
(9)
前記第4反射層は、金属を含む材料で構成された放熱体である
(8)に記載の発光素子。
(10)
当該発光素子は、前記蛍光体層の側面から光出力ができるように構成されている
(1)ないし(5)のいずれか一項に記載の発光素子。
(11)
前記蛍光体層は、前記第2反射層に接している
(5)に記載の発光素子。
(12)
前記蛍光体層は、樹脂層または空気層を介して前記第2反射層と対向配置されている
(5)に記載の発光素子。
(13)
前記蛍光体層は、前記第1反射鏡に接している
(1)ないし(5)のいずれか一項に記載の発光素子。
(14)
前記蛍光体層は、樹脂層または空気層を介して前記第1反射鏡と対向配置されている
(1)ないし(5)のいずれか一項に記載の発光素子。
(15)
複数の発光素子を備え、
各前記発光素子は、
活性層と、前記活性層を挟み込む第1半導体層および第2半導体層とを含む積層体と、
開口部を有する電流狭窄層と、
前記積層体および前記開口部を挟み込む、前記第1半導体層側の凹面状の第1反射鏡および前記第2半導体層側の第2反射鏡と、
前記第1反射鏡と所定の間隙を介して対向する位置に配置された第1反射層と、
前記第1反射鏡と前記第1反射層との間に配置され、前記第1反射鏡から漏れ出た光を
波長変換する蛍光体層と
を有する
発光装置。
Claims (15)
- 活性層と、前記活性層を挟み込む第1半導体層および第2半導体層とを含む積層体と、
開口部を有する電流狭窄層と、
前記積層体および前記開口部を挟み込む、前記第1半導体層側の凹面状の第1反射鏡および前記第2半導体層側の第2反射鏡と、
前記第1反射鏡と所定の間隙を介して対向する位置に配置された第1反射層と、
前記第1反射鏡と前記第1反射層との間に配置され、前記第1反射鏡から漏れ出た光を波長変換する蛍光体層と
を備えた
発光素子。 - 前記第1反射層は、前記第1反射鏡の表面形状に倣わない反射面を有する
請求項1に記載の発光素子。 - 前記反射面は、前記積層体の法線と平行な法線を有する平面である
請求項2に記載の発光素子。 - 前記第1反射層は、前記蛍光体層による波長変換により生成された光に対する反射率よりも、前記第1反射鏡から漏れ出た光に対する反射率の方が大きいブラッグ反射鏡を含む
請求項1に記載の発光素子。 - 前記第1反射鏡と蛍光体層との間に配置され、前記蛍光体層による波長変換により生成された光を反射する第2反射層を更に備えた
請求項4に記載の発光素子。 - 前記蛍光体層の側面を覆うとともに、前記反射面のうち前記開口部と対向する箇所を覆わないように形成された第3反射層を更に備えた
請求項1に記載の発光素子。 - 前記第3反射層は、金属を含む材料で構成された放熱体である
請求項6に記載の発光素子。 - 前記蛍光体層の側面を覆うとともに、前記第1反射層とともに前記第1反射鏡から漏れ出た光と、前記蛍光体層による波長変換により生成された光とを前記積層体側に反射するように形成された第4反射層を更に備えた
請求項1に記載の発光素子。 - 前記第4反射層は、金属を含む材料で構成された放熱体である
請求項8に記載の発光素子。 - 当該発光素子は、前記蛍光体層の側面から光出力ができるように構成されている
請求項1に記載の発光素子。 - 前記蛍光体層は、前記第2反射層に接している
請求項5に記載の発光素子。 - 前記蛍光体層は、樹脂層または空気層を介して前記第2反射層と対向配置されている
請求項5に記載の発光素子。 - 前記蛍光体層は、前記第1反射鏡に接している
請求項1に記載の発光素子。 - 前記蛍光体層は、樹脂層または空気層を介して前記第1反射鏡と対向配置されている
請求項1に記載の発光素子。 - 複数の発光素子を備え、
各前記発光素子は、
活性層と、前記活性層を挟み込む第1半導体層および第2半導体層とを含む積層体と、
開口部を有する電流狭窄層と、
前記積層体および前記開口部を挟み込む、前記第1半導体層側の凹面状の第1反射鏡および前記第2半導体層側の第2反射鏡と、
前記第1反射鏡と所定の間隙を介して対向する位置に配置された第1反射層と、
前記第1反射鏡と前記第1反射層との間に配置され、前記第1反射鏡から漏れ出た光を波長変換する蛍光体層と
を有する
発光装置。
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| PCT/JP2018/008234 Ceased WO2018190030A1 (ja) | 2017-04-14 | 2018-03-05 | 発光素子および発光装置 |
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| US (1) | US11011888B2 (ja) |
| EP (1) | EP3611811A4 (ja) |
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| US20200169061A1 (en) * | 2017-07-18 | 2020-05-28 | Sony Corporation | Light emitting element and light emitting element array |
| JPWO2020246280A1 (ja) * | 2019-06-04 | 2020-12-10 | ||
| JPWO2021124968A1 (ja) * | 2019-12-20 | 2021-06-24 | ||
| WO2021140822A1 (ja) * | 2020-01-08 | 2021-07-15 | ソニーグループ株式会社 | 発光素子及びその製造方法、並びに、発光素子アレイ |
| US11374384B2 (en) * | 2017-05-31 | 2022-06-28 | Sony Corporation | Light-emitting device and method of manufacturing light-emitting device |
| JPWO2022264954A1 (ja) * | 2021-06-16 | 2022-12-22 | ||
| WO2023002929A1 (ja) * | 2021-07-21 | 2023-01-26 | 京セラ株式会社 | 発光デバイス、表示デバイス、電子機器、並びに発光デバイスの製造方法および製造装置 |
| CN116438667A (zh) * | 2020-11-18 | 2023-07-14 | 苏州晶湛半导体有限公司 | 发光器件及其制备方法 |
| WO2024236916A1 (ja) * | 2023-05-18 | 2024-11-21 | ソニーグループ株式会社 | 発光素子 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7211362B2 (ja) | 2017-06-28 | 2023-01-24 | ソニーグループ株式会社 | 発光素子の製造方法 |
| WO2021140803A1 (ja) * | 2020-01-08 | 2021-07-15 | ソニーグループ株式会社 | 発光素子 |
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| JPWO2021124968A1 (ja) * | 2019-12-20 | 2021-06-24 | ||
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| US12463404B2 (en) | 2019-12-20 | 2025-11-04 | Sony Group Corporation | Vertical cavity surface emitting laser element, vertical cavity surface emitting laser element array, vertical cavity surface emitting laser module, and method of producing vertical cavity surface emitting laser element |
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| JP7593332B2 (ja) | 2020-01-08 | 2024-12-03 | ソニーグループ株式会社 | 発光素子及びその製造方法、並びに、発光素子アレイ |
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| JPWO2021140822A1 (ja) * | 2020-01-08 | 2021-07-15 | ||
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| WO2024236916A1 (ja) * | 2023-05-18 | 2024-11-21 | ソニーグループ株式会社 | 発光素子 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20200028325A1 (en) | 2020-01-23 |
| JP7024786B2 (ja) | 2022-02-24 |
| EP3611811A4 (en) | 2020-04-22 |
| EP3611811A1 (en) | 2020-02-19 |
| JPWO2018190030A1 (ja) | 2020-02-27 |
| US11011888B2 (en) | 2021-05-18 |
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