TWI458074B - Light-emitting device with light-emitting diode of composite phosphor layer - Google Patents

Description

Light-emitting device with light-emitting diode of composite phosphor layer

The present invention relates to a light emitting device, and more particularly to a light emitting device having a light emitting diode.

In recent years, blue light-emitting diodes (LEDs) have been commonly used in combination with fluorescent materials to produce light-emitting devices that emit white light. This illuminating device is commonly used in LED displays, backlights, traffic signs, lighting switches, indicators, and the like. Moreover, such a light-emitting device can operate only because a light-emitting diode (LED) as a light-emitting source requires only a low current, so that it can be greatly reduced compared to conventional incandescent lamps or fluorescent lamps. Energy consumption. In addition, the illuminating device using the illuminating diode as the illuminating source can have a longer service life than the conventional incandescent lamp or fluorescent lamp.

1 is a schematic view of a conventional light-emitting device using a blue light-emitting diode in combination with a mixed fluorescent material. A blue light emitting diode 102 is disposed on the substrate 101, and an input terminal 105 is connected to the blue light emitting diode 102 for providing electrical energy for the light emitting device to emit light. The blue light emitting diode 102 is covered with a mixed fluorescent material coating 103 (containing a fluorescent material which is excited by the blue light emitting diode 102 to emit red light and a fluorescent material which emits green light). Finally, a transparent hemispherical encapsulation cover 104 is overlaid to protect the inner blue light emitting diode 102 and the mixed phosphor coating 103 from moisture. However, the illuminating device thus designed is often that the green light excited by the blue light emitting diode in the fluorescent material coating layer 103 is again absorbed by the material capable of emitting red fluorescent light, resulting in green light emitting efficiency (ie, can be emitted per watt. The lumens, lumens/W) are reduced, thereby affecting the luminous efficiency of the entire device.

In view of the problem that green light is absorbed by a material that emits red fluorescent light, U.S. Patent No. 7,250,715 separates a fluorescent material that emits yellow-green light from a material that emits red fluorescent light while covering the same blue light-emitting diode. As shown in FIG. 2, the blue light emitting diode 202 is placed in the reflective cup 200 having the reflective inner surface, and the fluorescent material layer 204 which can emit yellow-green light is covered with the blue light emitting adjacent to the material layer 206 which can emit red fluorescent light. On the diode 202. The yellow light and red light are emitted by the phosphor layers 204 and 206, respectively, to solve the problem that the green light is absorbed. However, because the phosphor layers 204 and 206 are overlaid on the same blue LED 202, the luminous efficiency is often not maximized due to the confinement of the phosphor layers 204 and 206 to each other. In other words, if a blue light emitting diode is selected to increase the luminous efficiency of the fluorescent material layer 204, the blue light emitting diode does not necessarily provide the fluorescent material layer 206 with an optimum luminous efficiency, and vice versa.

The present invention has been conceived in view of the above circumstances, wherein the subject matter of the present invention is to divide a conventional mixed phosphor coating into at least two sets of phosphor coatings having different fluorescent main wavelengths (i.e., different colors), which may be individually Fluorescence with different fluorescent main wavelengths is emitted by excitation of corresponding light-emitting diodes of at least two sets of blue light-emitting diodes. In addition to solving the problem that the green light is absorbed, the optimal combination of the light-emitting diode and the fluorescent material coating can be selected according to the requirements and the purpose of use, so that the luminous efficiency of the light-emitting device is maximized, and the appropriate The circuit design, the operation IC, and the power supply enable the at least two sets of blue light-emitting diodes to pass the same or different currents, and each of the corresponding fluorescent material coatings is excited, so that the single light-emitting device can be used for the environment, White light of different color temperatures, such as demand and time.

The present application will describe a light-emitting device having a light-emitting diode of a composite phosphor layer, the light-emitting device comprising a complex array of light-emitting diodes capable of emitting a peak wavelength of light waves in the range of 360 nm to 490 nm, and the complex array of light-emitting diodes A complex array of phosphor layers covered by the body. At least two of the plurality of complex array light-emitting diodes have different emission peak wavelengths from each other. The fluorescent main wavelength of at least one of the phosphor layers of the complex array phosphor layer is in the range of 500 nm to 580 m, and the fluorescent main wavelength of at least one other of the plurality of phosphor layers in the complex array phosphor layer is In the range of 590 nm to 650 nm. It will be understood by those skilled in the art that, according to the well-known and accepted meaning, "principal wavelength" means the perceived color of the spectrum, ie, the single wavelength of light that is most similar to the perceived color perception of the visible light source; Refers to the spectral line with the greatest power in the spectral power distribution of the source. The light-emitting device of the present invention emits white light by mixing the light emitted by the complex array of light-emitting diodes and the phosphor of the complex array of phosphor layers excited by the light-emitting diodes.

Other objects and advantages of the present invention will be apparent from the following description and accompanying drawings.

Embodiments of the present invention will be described with reference to the accompanying drawings, and the drawings are also considered as a part of the detailed description.

In the following description, numerous specific embodiments are set forth in the description It will be apparent to those skilled in the art, however, that the invention may be practiced without some or all of these specific details. In other instances, well known processing operations have not been described in detail in order to avoid obscuring the present invention.

For convenience of description, in the following embodiments and the accompanying drawings, two sets of light-emitting diodes and two sets of phosphor layers respectively represent the group number of the light-emitting diode groups and the group of the phosphor layer group in the light-emitting device. number. However, in the embodiments of the present invention and the accompanying drawings, two sets of light-emitting diodes and two sets of phosphor layers in the light-emitting device should be considered as illustrative and not limiting. In other words, in the embodiment of the present invention, the number of groups of the light-emitting diode groups in the light-emitting device may be two or more groups, and the number of groups of the phosphor layer groups on the light-emitting diode group may be two or More than one group.

3A is a cross-sectional view of a light emitting device in accordance with an embodiment of the present invention. Numeral 300 denotes a concave structure having a reflective inner surface (hereinafter collectively referred to as a reflective cup). A first group of light emitting diodes 302 and a second group of light emitting diodes 304 are disposed in the reflective cup 300. The first group of light-emitting diodes 302 and the second group of light-emitting diodes 304 are selected from the group consisting of the following compounds consisting of group III-V elements: gallium nitride (GaN), aluminum nitride (AlN), indium nitride. (InN), aluminum gallium nitride (AlGaN), and indium gallium nitride (InGaN), but are not limited thereto. The peak wavelengths emitted by the first group of light-emitting diodes 302 and the second group of light-emitting diodes 304 may be individually distributed in the range of 360 nm to 490 nm, and the two sets of light-emitting diodes 302 and 304 may have different peak wavelengths. .

Next, an input terminal (not shown) is respectively connected to the first group of LEDs 302 and the second group of LEDs 304 to provide illumination of the first group of LEDs 302 and the second group of LEDs 304. The required electrical energy. The first group of phosphor layers 306 and the second group of phosphor layers 308 are respectively covered on the first group of LEDs 302 and the second group of LEDs 304, wherein the first group of phosphor layers 306 and the second group of phosphors The overlapping portions of the photocorporeal layer 308 are preferably minimized, preferably adjacent to each other without overlapping. The first set of phosphor layers 306 and the second set of phosphor layers 308 can be a single phosphor layer or a multiple phosphor layer, and the surfaces of the first set of phosphor layers 360 and the second set of phosphor layers 308 can be hemispherical. , convex, or flat. Referring to FIGS. 3B and 3C, the first set of phosphor layers 306 are excited by the light emitted by the first group of LEDs 302, thereby emitting fluorescence having a dominant wavelength in the range of 500 nm to 580 m; The phosphor layer 308 is excited by the light emitted by the second group of light-emitting diodes 304, thereby emitting fluorescence having a dominant wavelength in the range of 590 nm to 650 nm.

Referring again to FIG. 3A, a transparent layer 310 can be disposed to cover the first set of light emitting diodes 302, the second set of light emitting diodes 304, the first set of phosphor layers 306, and the second set of phosphor layers 308. To protect these components from moisture. The transparent layer 310 may include at least one of the following: for example, epoxy, silicone, polyimide, acryl, polycarbonate, Or a transparent polymeric material of parylene; and a transparent material such as quartz or glass. Moreover, the transparent layer 310 can be a single layer or a multilayer structure. Finally, the transparent layer 310 is covered with the diffusion layer 312, and the light emitted by the first group of LEDs 302 and the second group of LEDs 304 is combined with the first group of phosphor layers 306 and the second group of phosphor layers 308. The fluorescent light emitted by the excitation is more uniformly mixed to produce white light. Furthermore, another function of the transparent layer 310 is to allow the interface between the transparent layer 310 and the upper layer material (for example, the diffusion layer 312) to be reflected by the refractive index differently or affected by the interlayer granular molecules, and has a larger The probability is directed toward the reflective inner surface of the reflector cup 300 rather than being directly absorbed by the first set of phosphor layers 306 and the second set of phosphor layers 308, thereby increasing luminous efficiency. In addition, the reflective cup 300 can deflect the light emitted from the light-emitting diode or the light reflected in the structural interface above the light-emitting diode to the light-emitting direction (as indicated by the arrow), thereby increasing the luminous efficiency.

4 is a cross-sectional view of another light emitting device in accordance with an embodiment of the present invention. The difference from the light-emitting device of FIG. 3A is that an anti-reflective coating (ARC) 311 is added between the transparent layer 310 and the diffusion layer 312. We can use at least one of spin-coating, dip-coating, chemical vapor deposition, thermal evaporation, and e-beam evaporation. An anti-reflection coating 311 is formed. The anti-reflective coating 311 may include, for example but not limited to, at least one of the following: nitrocellulose, Cellulose esters, cellulose acetate, cellulose acetate butyrate A transparent layer of Teflon, Cytop, SiO ₂ , SiNx, SiO _x N _y , TiO ₂ , MgO, or MgF ₂ . The anti-reflective coating 311 can be used to make the light generated in the reflective cup 300 (including the light emitted by the first group of LEDs 302 and the second group of LEDs 304, the first group of phosphor layers 306 and the second The group of phosphor layers 308 are excited by the fluorescence emitted by the excitation and the light reflected from the reflective cup 300, and the light scattered in the diffusion layer 312 by the intergranular particles can be diffused in the diffusion layer 312 and the anti-reflection coating. The interface between layers 311 is again folded back into the light exit direction (as indicated by the arrows), thereby increasing the luminous efficiency of the illumination device.

As shown in FIG. 5, the transparent layer 310 and the diffusion layer 312 of FIG. 3A may be integrated into a diffusion layer 314 having a cladding effect to achieve protection of the first group of LEDs 302 and the second group in the reflective cup 300. The function of the light emitting diode 304, the first group of phosphor layers 306, and the second group of phosphor layers 308, and the light emitted by the first group of LEDs 302 and the second group of LEDs 304 A set of phosphor layers 306 and a second set of phosphor layers 308 are more uniformly mixed by the excitation of the fluorescent light to produce white light.

It should be understood that one or more light-emitting diode units may be provided in each of the plurality of complex array light-emitting diodes of the light-emitting device of the present invention depending on the needs and purposes of use. In other words, each of the plurality of complex array light-emitting diodes may each have more than one light-emitting diode individual. Figure 6A is a cross-sectional view showing the first and second sets of light emitting diodes each having two light emitting diode bodies in accordance with an embodiment of the present invention. Figure 6B is a top plan view of the structure of Figure 6A. As shown in FIG. 6A, a first group of light emitting diodes 402 and a second group of light emitting diodes 404 are disposed within a recessed structure (hereinafter collectively referred to as a reflective cup) 400 having a reflective inner surface. The first group of light-emitting diodes 402 and the second group of light-emitting diodes 404 are selected from the following compounds consisting of group III-V elements: gallium nitride (GaN), aluminum nitride (AlN), indium nitride (InN), aluminum gallium nitride (AlGaN), and indium gallium nitride (InGaN), but are not limited thereto. As shown in FIG. 6B, the first set of light emitting diodes 402 includes two light emitting diode bodies 402a and 402b; and the second set of light emitting diodes 404 includes two light emitting diode bodies 404a and 404b. The peak wavelengths emitted by the first group of light-emitting diodes 402 and the second group of light-emitting diodes 404 may be individually distributed in the range of 360 nm to 490 nm, and the two sets of light-emitting diodes 402 and 404 may have different peaks. wavelength. It should be noted that although in FIG. 6A and FIG. 6B, each group of light-emitting diodes in the light-emitting device only displays two light-emitting diode bodies, in fact, it is not limited thereto, that is, each group of light-emitting diodes may include one Or multiple light-emitting diode individuals. In addition, each of the plurality of light-emitting diodes in each group of light-emitting diodes may have the same size or different sizes.

Next, an input terminal (not shown) is respectively connected to the first group of LEDs 402 and the second group of LEDs 404 to provide illumination of the first group of LEDs 402 and the second group of LEDs 404. The required electrical energy. The first group of phosphor layers 406 and the second group of phosphor layers 408 are respectively covered on the first group of LEDs 402 and the second group of LEDs 404, wherein the first group of phosphor layers 406 and the second group of phosphors The overlapping portions of the body layer 408 are preferably minimized, preferably adjacent to each other without overlapping. The first set of phosphor layers 406 and the second set of phosphor layers 408 may be a single phosphor layer or a multiple phosphor layer, and the surfaces of the first set of phosphor layers 460 and the second set of phosphor layers 408 may be hemispherical. , convex, or flat. Furthermore, the first set of phosphor layers 406 and the second set of phosphor layers 408 can also cover a plurality of individual light-emitting diodes according to needs or purposes. For example, the first group of light-emitting diodes 402 may include only a plurality of light-emitting diode bodies, and the first group of phosphor layers 460 may be covered thereon, and the second group of light-emitting diodes 404 may be included in the number. The number of light-emitting diodes that are not equal to the number of individual light-emitting diodes in the first group of light-emitting diodes 402, and the second set of phosphor layers 408 are overlaid thereon. 3B and 3C, the first set of phosphor layers 406 are excited by the light emitted by the first group of light-emitting diodes 402, thereby emitting fluorescence having a dominant wavelength in the range of 500 nm to 580 m; The phosphor layer 408 is excited by the light emitted by the second group of light-emitting diodes 404, thereby emitting fluorescence having a dominant wavelength in the range of 590 nm to 650 nm.

Next, referring again to FIG. 6A, a transparent layer 410 may be disposed to cover the first group of light emitting diodes 402, the second group of light emitting diodes 404, the first set of phosphor layers 406, and the second set of phosphor layers 408. To protect these components from moisture. The transparent layer 410 may include at least one of the following: a transparent high molecular material such as an epoxy resin, a silicone resin, a polyimide resin, an acrylic resin, a polycarbonate, or a parylene; and a quartz or glass such as quartz or glass. Transparent material. Moreover, the transparent layer 410 can be a single layer or a multilayer structure. Finally, the transparent layer 410 is covered with the diffusion layer 412, and the light emitted by the first group of LEDs 402 and the second group of LEDs 404 is combined with the first group of phosphor layers 406 and the second group of phosphor layers 408. The fluorescent light emitted by the excitation is more uniformly mixed to produce white light. Furthermore, another function of the transparent layer 410 is to enable the interface between the transparent layer 410 and the upper layer material (for example, the diffusion layer 412) to be reflected by the refractive index or affected by the intergranular granular molecules. The probability is directed toward the reflective inner surface of the reflective cup 400 rather than being directly absorbed by the first set of phosphor layers 406 and the second set of phosphor layers 408, thereby increasing luminous efficiency. In addition, the reflective cup 400 can deflect the light emitted from the light-emitting diode or the light reflected in the structural interface above the light-emitting diode to the light-emitting direction (as indicated by the arrow), thereby increasing the luminous efficiency.

In addition, the multi-array light-emitting diodes in the light-emitting device can be connected in series or in parallel according to the purpose or requirement of use, and can be matched with appropriate circuit design, operation IC, and power supply, with the same or different operating currents, The complex array of light-emitting diodes is operated simultaneously or separately. A plurality of individual light-emitting diodes in each group of light-emitting diodes may also be connected in series or in parallel according to the purpose or need of use, and with appropriate circuit design, operation IC, and power supply, the same or different The operating current is operated simultaneously or separately for the plurality of individual light-emitting diodes.

The present invention is also applicable to a light-emitting device of a surface-adhesive light-emitting diode. Figure 7A is a cross-sectional view of a light-emitting device with a light-emitting diode attached to a surface of a substrate in accordance with an embodiment of the present invention. A first group of light emitting diodes 502 and a second group of light emitting diodes 504 are adhered to the substrate 500, wherein the substrate can be a semiconductor, a metal, a ceramic, or a metal matrix composites (MMCs). The first group of light-emitting diodes 502 and the second group of light-emitting diodes 504 are selected from the following compounds consisting of group III-V elements: gallium nitride (GaN), aluminum nitride (AlN), nitrogen Indium (InN), aluminum gallium nitride (AlGaN), and indium gallium nitride (InGaN), but are not limited thereto. A reflective surface (not shown) is disposed between the substrate 500 and the first set of light emitting diodes 502 and the second set of light emitting diodes 504. As described above, the reflective surface can be self-illuminating. The light emitted by the polar body or the light reflected in the structural interface above the light-emitting diode is folded toward the light-emitting direction (as indicated by the arrow), thereby increasing the luminous efficiency. The peak wavelengths emitted by the first group of light-emitting diodes 502 and the second group of light-emitting diodes 504 may be distributed in the range of 360 nm to 490 nm, and the two sets of light-emitting diodes 502 and 504 may have different peak wavelengths. As described above, for the needs and purposes of use, the first group of light-emitting diodes 502 and the second group of light-emitting diodes 504 may each have more than one light-emitting diode individual, and the first group of light-emitting diodes The number of light-emitting diodes possessed by 502 is not necessarily equal to the number of light-emitting diodes possessed by the second group of light-emitting diodes 5042. In addition, the respective sizes of the plurality of light-emitting diode bodies in each group of the light-emitting diodes may be the same or different.

Next, the input terminal 501 is respectively connected to the first group of the LEDs 502 and the second group of LEDs 504 to provide the first group of LEDs 502 and the second group of LEDs 504 for illumination. Electrical energy. A transparent layer 506 is disposed above the first group of light emitting diodes 502 and the second group of light emitting diodes 504 to cover the first group of light emitting diodes 502 and the second group of light emitting diodes 504, thereby protecting them from Affected by moisture. The transparent layer 506 may include at least one of the following: a transparent high molecular material such as an epoxy resin, a silicone resin, a polyimide resin, an acrylic resin, a polycarbonate, or a parylene; and a glass or quartz, for example. Transparent material. In addition, the transparent layer 506 may be a single layer or a multi-layer structure, and the transparent layer 506 may have a hemispherical shape, a convex shape, a conical shape, or a Fresnel lens shape, and according to the needs of use. The purpose is to optimize the light energy emitted by the first group of light-emitting diodes 502 and the second group of light-emitting diodes 504.

Next, at a position on the transparent layer 506 relative to the first group of the LEDs 502 and the second group of LEDs 504, the first group of phosphor layers 508 and the second group of phosphor layers 510 are respectively covered. a set of light-emitting diodes 502 and a second group of light-emitting diodes 504, wherein the overlapping portions of the first set of phosphor layers 508 and the second set of phosphor layers 510 are preferably minimized, preferably adjacent to each other without overlapping . Furthermore, another function of the transparent layer 506 is to make the interface between the transparent layer 506 and its upper layer material (for example, the first group of phosphor layers 508 and the second group of phosphor layers 510) different or different by the intergranular layer. The light reflected by the molecules has a greater probability of being incident on the reflecting surface of the substrate 500 instead of being directly absorbed by the first group of light emitting diodes 502 and the second group of light emitting diodes 504, thereby improving luminous efficiency.

As described above, the first set of phosphor layers 508 and the second set of phosphor layers 510 can cover a varying number of light-emitting diode bodies as needed or desired. Referring to FIGS. 3B and 3C, the first set of phosphor layers 508 are excited by the light emitted by the first group of light-emitting diodes 502, thereby emitting fluorescence having a dominant wavelength in the range of 500 nm to 580 m, and the second group. The phosphor layer 510 is excited by the light emitted by the second group of light-emitting diodes 504, thereby emitting fluorescence having a dominant wavelength in the range of 590 nm to 650 nm. The first set of phosphor layers 508 and the second set of phosphor layers 510 may be a single phosphor layer or a multiple phosphor layer, and the surfaces of the first set of phosphor layers 508 and the second set of phosphor layers 510 may be hemispherical. , convex, or flat.

Finally, a transparent encapsulation layer 516 is disposed to cover the first group of light emitting diodes 502, the second group of light emitting diodes 504, the transparent layer 506, the first group of phosphor layers 508, the second group of phosphor layers 510, and the input The terminal 501 is configured to protect the first group of the LEDs 502, the second group of LEDs 504, the transparent layer 506, the first group of phosphor layers 508, the second group of phosphor layers 510, and the input terminals 501 from The impact of moisture. In addition, the shape of the transparent encapsulation layer 516 may include hemispherical, convex, conical, or Fresnel lens shapes depending on the needs and purposes of use. In other words, the shape of the transparent encapsulation layer 516 can be designed such that the first group of LEDs 502, the second group of LEDs 504, the first group of phosphor layers 508, and the second group of phosphor layers 510 are emitted. The light is maximized to increase the luminous efficiency of the illuminating device. The transparent encapsulation layer 516 may include at least one of the following: a transparent high molecular material such as an epoxy resin, a silicone resin, a polyimide resin, an acrylic resin, a polycarbonate, or a parylene; and, for example, glass or quartz Transparent material. Moreover, the transparent encapsulation layer 516 can be a single layer or a multilayer structure.

7B through 7E are cross-sectional views showing a derivative type of light-emitting device based on the structure of the light-emitting device of FIG. 7A in accordance with an embodiment of the present invention. In FIG. 7B, the first set of phosphor layers 508 and the second set of phosphor layers 510 are covered with a diffusion layer 514, and then the first group of light-emitting diodes 502 are covered with a transparent encapsulation layer 516. Two sets of light emitting diodes 504, a transparent layer 506, a first set of phosphor layers 508, a second set of phosphor layers 510, a diffusion layer 514, and an input terminal 501, such that the first group of light emitting diodes 502, the second The group of light emitting diodes 504, the transparent layer 506, the first set of phosphor layers 508, the second set of phosphor layers 510, the diffusion layer 514, and the input terminals 501 are protected from moisture. The function of the diffusion layer 512 is to cause the light emitted by the first group of LEDs 502 and the second group of LEDs 504 to be excited by the first group of phosphor layers 508 and the second group of phosphor layers 510. The fluorescent light is more evenly mixed to produce white light.

In FIG. 7C, after coating the transparent layer 506 and before covering the first set of phosphor layers 508 and the second set of phosphor layers 510, spin coating, dip coating, chemical vapor deposition, thermal evaporation may be performed. At least one of the method and the electron beam evaporation method forms an anti-reflective coating 505 on the transparent layer 506. The anti-reflective coating 505 can include, for example but not limited to, at least one of the following: nitrocellulose, cellulose ester, cellulose acetate, cellulose acetate butyrate, Teflon, fluororesin, SiO ₂ , SiNx, SiO _x N a transparent layer of _y , TiO ₂ , MgO, or MgF ₂ . The anti-reflective coating 505 can be used to cover the light emitted within the area (including the light emitted by the first set of light-emitting diodes 502 and the second set of light-emitting diodes 504, and the light reflected from the substrate 500 having the reflective surface). And passing light through the first set of phosphor layers 508 and the second set of phosphor layers 510 and the second set of phosphor layers The interface between the anti-reflective coating 505 and the anti-reflective coating 505 is again folded back (as indicated by the arrow), thereby increasing the luminous efficiency of the light-emitting device.

FIG. 7D depicts overlaying the transparent layer 512 between the first set of phosphor layers 508 and the second set of phosphor layers 510 and diffusion layer 514 described above. In addition to enhancing the protection of the first set of phosphor layers 508, the second set of phosphor layers 510, and the structures under the two sets of phosphor layers from the moisture, the transparent layer 512 can also be used to transparently layer 512 from The light of the interface of the upper layer material (for example, the diffusion layer 514) is reflected by the difference in refractive index or the influence of the intergranular granular molecules, and has a greater probability of being directed toward the reflective surface of the substrate 500 instead of being directly used by the first group of phosphor layers. 508 is absorbed with the second set of phosphor layers 510 to increase luminous efficiency. The transparent layer 512 may include at least one of the following: a transparent high molecular material such as an epoxy resin, a silicone resin, a polyimide resin, an acrylic resin, a polycarbonate, or a parylene; and a glass or quartz, for example. Transparent material. In addition, the transparent layer 512 may be a single layer or a multi-layer structure, and the transparent layer 512 may have a hemispherical shape, a convex shape, a tapered shape, or a Fresnel lens shape, and may be selected according to the needs and purposes of use. A suitable shape allows the light energy emitted by the first group of light-emitting diodes 502, the second group of light-emitting diodes 504, the first group of phosphor layers 508, and the second group of phosphor layers 510 to be optimally extracted.

FIG. 7E depicts the formation of a hollow layer 507 between the transparent layer 506 described above and the first set of phosphor layers 508 and the second set of phosphor layers 510. The hollow layer 507 can contain air. The hollow layer 507 may further contain N ₂ , Ar, or other inert gas based on reliability considerations. The thickness of the hollow layer 507 is approximately in the range of 0.01 mm to 10 mm. Since the refractive index of the hollow layer 507 is about 1 (because air, N ₂ , Ar, or other inert gas has a refractive index of about 1) and the refractive index of the phosphor layer is about 1.5, it should be understood by those skilled in the art. When light enters the first set of phosphor layers 508 and the second set of phosphor layers 510 from the hollow layer 507, total reflection does not occur. Therefore, the function of the hollow layer 507 is to make the light emitted by the first group of the light-emitting diodes 502 and the second group of light-emitting diodes 504 substantially completely through the hollow layer 507 and the first group of phosphor layers 508 and the second group. The interface between the phosphor layers 510. On the other hand, the light scattered from the first set of phosphor layers 508 and the second set of phosphor layers 510 is also likely to form total reflection due to the difference in refractive index between the hollow layer 507 and the phosphor layer, thereby reducing direct The first set of phosphor layers 508, the second set of phosphor layers 510 and the transparent layer 506 are absorbed, thereby increasing the overall luminous efficiency of the illumination device.

It is understood by those skilled in the art that the hollow layer 507, the transparent layer 512, and the diffusion layer 514 described in FIGS. 7B-7E can be set or omitted depending on the needs and purposes of use. In other words, the order in which the specific description is described should not be construed as implying that these structures are necessarily present in the light-emitting device of the present invention.

8A and 8B are respectively showing the spectrum and color rendering index (CRI) of the light-emitting device of the present invention combined with a conventional blue light-emitting diode and a mixed fluorescent material (YAG or a phosphor layer of a silicate). ) Comparison. The blue light (360-490 nm), the green fluorescent light (500-580 nm), and the red fluorescent light (590-650 nm) are optimally emitted by the configuration of the present invention, thereby obtaining a more optimized spectrum of the conventional light-emitting device and Color rendering index (CRI).

Furthermore, referring to Table 1, it is assumed that two sets of 1 mm square GaN light-emitting diodes (having different peak wavelengths), green fluorescent materials (peak wavelength = 521 nm, dominant wavelength = 534 nm), and red light are used. The phosphor material (peak wavelength = 635 nm, dominant wavelength = 611 nm), the present invention is about 26.7% higher in brightness than the prior art. Wherein, the configuration of the present invention is as described above, that is, one of the two sets of 1 mm square GaN light-emitting diodes is covered with a phosphor layer of a green fluorescent material, and the red fluorescent light is used. The phosphor layer of the material covers the other of the two sets of 1 mm square GaN light-emitting diodes (refer to FIG. 7A); whereas the prior art is to mix the green light fluorescent material with the red light fluorescent material to form a fluorescent light. After the bulk layer, the two sets of 1 Å square GaN light-emitting diodes are covered (see FIG. 1).

It should be noted that the first group of light-emitting diodes, the second group of light-emitting diodes, the first group of phosphor layers and the second group of phosphor layers in the drawings mentioned in the accompanying embodiments or in the accompanying drawings There is no absolute correspondence between the two groups, that is, the first group of phosphor layers do not have to cooperate with the first group of light-emitting diodes, and the second group of phosphor layers do not necessarily have to cooperate with the second group of light-emitting diodes. Therefore, the light-emitting diode group (the first group of light-emitting diodes and the second group of light-emitting diodes) and the phosphor layer group (the first group of phosphor layers) are described in the detailed description and accompanying drawings. The serial numbers of the second set of phosphor layers are for illustrative purposes only and are not to be construed as limiting.

While the invention has been described by the embodiments of the invention, it will be understood Therefore, it is intended that the present invention include all such modifications,

101. . . Substrate

102. . . Blue light emitting diode

103. . . Fluorescent material coating

104. . . Transparent hemispherical encapsulation

105. . . Input terminal

200. . . Reflective cup

202. . . Blue light emitting diode

204. . . Fluorescent material layer

206. . . Fluorescent material layer

300. . . Reflective cup

302. . . First group of light-emitting diodes

304. . . Second group of light-emitting diodes

306. . . First set of fluorescent layers

308. . . Second set of fluorescent layers

310. . . Transparent layer

311. . . Anti-reflective coating

312. . . Diffusion layer

314. . . Diffusion layer

400. . . Reflective cup

402. . . First group of light-emitting diodes

402a. . . Light-emitting diode individual

402b. . . Light-emitting diode individual

404. . . Second group of light-emitting diodes

404a. . . Light-emitting diode individual

404b. . . Light-emitting diode individual

406. . . First set of fluorescent layers

408. . . Second set of fluorescent layers

410. . . Transparent layer

412. . . Diffusion layer

500. . . Base

501. . . Input terminal

502. . . First group of light-emitting diodes

504. . . Second group of light-emitting diodes

505. . . Anti-reflective coating

506. . . First transparent layer

507. . . Hollow layer

508. . . First set of fluorescent layers

510. . . Second set of fluorescent layers

512. . . Second transparent layer

514. . . Diffusion layer

516. . . Transparent encapsulation layer

The invention will be readily understood by the following detailed description and the accompanying drawings, and the claims

1 is a schematic view of a conventional light-emitting device using a blue light-emitting diode in combination with a mixed fluorescent material.

2 is a schematic view of a conventional light-emitting device using a blue light-emitting diode combined with a yellow-green fluorescent paint layer and a red fluorescent paint layer.

3A is a cross-sectional view of a light emitting device in accordance with an embodiment of the present invention.

3B and 3C are spectra of a blue LED having a green phosphor layer and a red phosphor layer, respectively, in accordance with an embodiment of the present invention.

4 is a cross-sectional view of another light emitting device in accordance with an embodiment of the present invention.

Figure 5 is a cross-sectional view of another illuminating device incorporating a diffusion layer and a transparent layer in accordance with an embodiment of the present invention.

Figure 6A is a cross-sectional view showing the first and second sets of light emitting diodes each having two light emitting diode bodies in accordance with an embodiment of the present invention.

Figure 6B is a top plan view of the structure of Figure 6A.

Figure 7A is a cross-sectional view of a light-emitting device with a light-emitting diode attached to a surface of a substrate in accordance with an embodiment of the present invention.

7B through 7E are cross-sectional views showing a derivative type of light-emitting device based on the structure of the light-emitting device of FIG. 7A in accordance with an embodiment of the present invention.

8A and 8B are respectively a comparison of the spectrum and color rendering index of the present invention with a conventional commercial light-emitting device (phosphor layer using YAG or citrate).

300. . . Reflective cup

302. . . First group of light-emitting diodes

304. . . Second group of light-emitting diodes

306. . . First set of fluorescent layers

308. . . Second set of fluorescent layers

310. . . Transparent layer

312. . . Diffusion layer

Claims (60)

A light-emitting device having a light-emitting diode of a composite phosphor layer, comprising: a complex array of light-emitting diodes, at least two of the plurality of light-emitting diodes having different emission peak wavelengths; a complex array of phosphor layers, Covering each group of light-emitting diodes corresponding to the complex array of light-emitting diodes, at least one of the phosphor layers of the complex array of phosphor layers can receive part of the light emitted by the corresponding light-emitting diodes Exciting to emit light having a dominant wavelength in the range of about 500 nm to 580 m; and at least another set of phosphor layers in the complex array of phosphor layers can be excited by a portion of the light emitted by the corresponding light emitting diode And emitting a light having a dominant wavelength in a range of about 590 nm to 650 nm; a transparent layer overlying the complex array of phosphor layers; an anti-reflective coating overlying the transparent layer; and an input terminal, The light emitting device is connected and used to provide energy to the light emitting device to cause the light emitting device to emit light. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein the complex array light-emitting diode has an emission peak wavelength in a range of 360 nm to 490 nm. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein any one of the plurality of light-emitting diodes comprises at least one semiconductor light-emitting individual. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein the multiple array light-emitting diode system is connected in parallel. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein the multiple array light-emitting diode system is connected in series. The hair emitting diode having a composite phosphor layer as claimed in claim 3 The optical device, wherein the light-emitting diode systems in the complex array of light-emitting diodes are connected in parallel. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 3, wherein the light-emitting diode systems in the complex array light-emitting diode are connected in series. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 3, wherein the number of the light-emitting diodes included in at least two of the plurality of complex light-emitting diodes is equal. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 3, wherein the number of the light-emitting diodes included in at least two of the plurality of complex light-emitting diodes is unequal. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 3, wherein the light-emitting diodes of the complex array of light-emitting diodes have the same size. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 3, wherein the light-emitting diodes of the complex array of light-emitting diodes are different in size. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein the complex array of light-emitting diodes can be separately controlled. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 3, wherein the individual light-emitting diodes in the complex array of light-emitting diodes can be separately controlled. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein any one of the complex array phosphor layers comprises at least one phosphor layer. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein the complex array phosphor layer has a hemispherical surface, a convex surface, or a flat surface. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 3, wherein the number of the light-emitting diode bodies covered by the complex array phosphor layer is equal or unequal. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein the complex array of phosphor layers are adjacent to each other without overlapping. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, further comprising a concave structure having a reflective inner surface, wherein the complex array light-emitting diode system is disposed on the reflective inner surface of the concave structure And the reflective inner surface of the concave structure is capable of reflecting the light emitted by the complex array of light-emitting diodes and the complex array of phosphor layers. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein the transparent layer comprises at least one of the following transparent materials: epoxy resin, epoxy resin, polyimide resin, glass, Quartz, acrylic, polycarbonate, or parylene. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein the transparent layer comprises one or more layers. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein the anti-reflective coating comprises at least one of the following transparent materials: nitrocellulose, cellulose ester, cellulose acetate, acetate Acid cellulose, Teflon, fluororesin, SiO ₂ , SiNx, SiO _x N _y , TiO ₂ , MgO, or MgF ₂ . A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 1, wherein the anti-reflective coating is formed by at least one of the following methods: spin coating, dip coating, chemical vapor phase Deposition method, thermal evaporation method, and electron beam evaporation method. The light-emitting device of the light-emitting diode having a composite phosphor layer according to claim 1, further comprising: a diffusion layer covering the complex array phosphor layer to make the complex array phosphor layer and the complex The light emitted by the group of light-emitting diodes is more uniformly mixed. A light-emitting device having a light-emitting diode of a composite phosphor layer, comprising: a substrate; a complex array of light-emitting diodes, at least two of the plurality of light-emitting diodes having different emission peak wavelengths; a transparent layer, Covering the complex array of light-emitting diodes; a complex array of phosphor layers covering the transparent layer and corresponding to each group of light-emitting diodes in the complex array of light-emitting diodes, the complex array of phosphor layers At least one of the phosphor layers can be excited by a portion of the light emitted by the corresponding light emitting diode to emit light having a dominant wavelength in the range of about 500 nm to 580 m; and at least the complex array of phosphor layers Another set of phosphor layers can be excited by a portion of the light emitted by the corresponding light-emitting diode to emit light having a dominant wavelength in the range of about 590 nm to 650 nm; and an input terminal connected to the light-emitting device and used The illuminating device is caused to emit light by supplying energy to the illuminating device. The illuminating device of the illuminating diode having a composite phosphor layer according to claim 24, wherein the substrate has a reflecting surface, and the complex array illuminating diode system is provided. The reflective surface is disposed on the reflective surface of the substrate, and the reflective surface is capable of reflecting the light emitted by the complex array of light-emitting diodes and the complex array of phosphor layers. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, wherein the complex array light-emitting diode has an emission peak wavelength in the range of 360 nm to 490 nm. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, wherein any one of the plurality of light-emitting diodes comprises at least one semiconductor light-emitting individual. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, wherein the complex array light-emitting diode system is connected in parallel. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, wherein the complex array light-emitting diode system is connected in series. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 27, wherein the light-emitting diode systems of the multiple array light-emitting diodes are connected in parallel. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 27, wherein the light-emitting diode systems of the complex array of light-emitting diodes are connected in series. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 27, wherein the number of the light-emitting diodes included in at least two of the plurality of complex light-emitting diodes is equal. A light-emitting diode having a composite phosphor layer as claimed in claim 27 The illuminating device, wherein the number of the illuminating diode bodies included in at least two of the plurality of complex array illuminating diodes is unequal. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 27, wherein the individual light-emitting diodes in the complex array of light-emitting diodes are the same size. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 27, wherein the light-emitting diodes of the complex array of light-emitting diodes are of different sizes. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, wherein the complex array of light-emitting diodes can be separately controlled. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 27, wherein the individual light-emitting diodes in the complex array of light-emitting diodes can be separately controlled. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, wherein any one of the plurality of phosphor layers comprises at least one phosphor layer. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, wherein the complex array phosphor layer has a hemispherical surface, a convex surface, or a flat surface. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, wherein the number of the light-emitting diode bodies covered by the complex array phosphor layer is equal or unequal. A light-emitting diode having a composite phosphor layer as claimed in claim 24 A light emitting device wherein the plurality of phosphor layers are adjacent to each other without overlapping. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, wherein the transparent layer comprises at least one of the following transparent materials: epoxy resin, epoxy resin, polyamido resin, glass , quartz, acrylic, polycarbonate, or parylene. A light-emitting device having a light-emitting diode of a composite phosphor layer as in claim 42 wherein the transparent layer comprises one or more layers. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, wherein the transparent layer is in the shape of a hemisphere, a convex, a cone, or a Fresnel lens. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, further comprising an anti-reflection coating disposed between the transparent layer and the complex array phosphor layer. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 45, wherein the anti-reflective coating comprises at least one of the following transparent materials: nitrocellulose, cellulose ester, cellulose acetate, acetic acid Acid cellulose, Teflon, fluororesin, SiO ₂ , SiNx, SiO _x N _y , TiO ₂ , MgO, or MgF ₂ . A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 45, wherein the anti-reflective coating is formed by at least one of the following methods: spin coating, dip coating, chemical vapor phase Deposition method, thermal evaporation method, and electron beam evaporation method. The illuminating device of the illuminating diode having the composite phosphor layer as claimed in claim 24, further comprising: A hollow layer is interposed between the transparent layer and the complex array phosphor layer, and the hollow layer has a thickness of between 0.01 mm and 10 mm. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 48, wherein the hollow layer contains air. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 48, wherein the hollow layer comprises N ₂ , Ar, or other inert gas. The light-emitting device of the light-emitting diode having a composite phosphor layer according to claim 24, further comprising: a diffusion layer covering the complex array phosphor layer to make the complex array light-emitting diode and the The light emitted by the complex array of phosphor layers is more evenly mixed. The light-emitting device of the light-emitting diode having a composite phosphor layer according to claim 51, further comprising: a transparent layer disposed between the diffusion layer and the complex array phosphor layer to enhance protection of the complex array The phosphor layer and the structure under the phosphor layer are protected from moisture. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 52, wherein the transparent layer comprises at least one of the following transparent materials: epoxy resin, epoxy resin, polyimide resin, glass, Quartz, acrylic, polycarbonate, or parylene. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 52, wherein the transparent layer comprises one or more layers. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 52, wherein the transparent layer is a hemispherical, convex, tapered, or Fresnel lens shape. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 24, further comprising a transparent encapsulation layer overlying the complex array phosphor layer. The light-emitting device of the light-emitting diode having a composite phosphor layer according to claim 56, wherein the transparent encapsulation layer comprises at least one of the following transparent materials: epoxy resin, epoxy resin, polyamido resin, glass , quartz, acrylic, polycarbonate, or parylene. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 56, wherein the transparent encapsulation layer is in the shape of a hemisphere, a convex shape, a cone shape, or a Fresnel lens. A light-emitting device having a light-emitting diode of a composite phosphor layer according to claim 56, wherein the transparent encapsulation layer comprises one or more layers. A light-emitting device having a light-emitting diode of a composite phosphor layer as claimed in claim 24, the substrate may be a metal-based composite material.