WO2013047407A1 - 発光装置及び塗布液 - Google Patents
発光装置及び塗布液 Download PDFInfo
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- WO2013047407A1 WO2013047407A1 PCT/JP2012/074337 JP2012074337W WO2013047407A1 WO 2013047407 A1 WO2013047407 A1 WO 2013047407A1 JP 2012074337 W JP2012074337 W JP 2012074337W WO 2013047407 A1 WO2013047407 A1 WO 2013047407A1
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- polysiloxane
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/851—Wavelength conversion means
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/84—Coatings, e.g. passivation layers or antireflective coatings
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/852—Encapsulations
- H10H20/854—Encapsulations characterised by their material, e.g. epoxy or silicone resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/045—Polysiloxanes containing less than 25 silicon atoms
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/851—Wavelength conversion means
- H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
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- H10W72/07251—
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- H10W72/20—
Definitions
- Embodiments of the present invention relate to a technique for sealing a light emitting element in a light emitting device.
- a technology for obtaining a white light emitting device in which a phosphor such as a YAG (yttrium, aluminum, garnet) phosphor is disposed in the vicinity of a gallium nitride (GaN) blue LED (Light Emitting Diode) chip has been widely used. It has been.
- white light is emitted by a color mixture of blue light emitted from the blue LED chip and yellow light emitted when the phosphor receives blue light and emits secondary light.
- a technique of emitting white light by mixing color of blue light emitted from the blue LED chip and red light and green light emitted by each phosphor receiving blue light and secondary light emission is also used. Yes.
- Such white light emitting devices have various uses, for example, there is a demand as an alternative to fluorescent lamps and incandescent lamps. In addition, it is also being used in lighting devices such as automobile headlights that require extremely high luminance.
- silicone may be used to fix the phosphor on the light emitting element.
- the corrosive gas permeates the silicone layer, corrodes the reflector and the electrode sealed with this silicone layer, and the light reflectance decreases. As a result, the luminous efficiency was lowered.
- a technique for forming an intermediate layer containing siloxane between the light emitting element and the silicone layer is disclosed.
- this intermediate layer is formed of only trifunctional polysiloxane, the adhesion with the silicone layer is poor, and film peeling may occur during reflow.
- the intermediate layer is formed of only tetrafunctional polysiloxane, a crack is generated during firing, which causes a problem that it cannot be used.
- an object of the present invention is to make it possible to form an intermediate layer that has anticorrosion properties and adhesion to a silicone layer and can prevent cracks during firing.
- the invention according to claim 1 is a light emitting device in which a light emitting element is covered with a silicone layer, and has an intermediate layer interposed between the light emitting element and the silicone layer, and the intermediate layer is trifunctional.
- the light emitting device is formed of a mixture of polysiloxane and tetrafunctional polysiloxane.
- the invention described in claim 2 is the light emitting device according to claim 1, characterized in that the content of the trifunctional polysiloxane in the mixture is 10 wt% to 90 wt%.
- the invention described in claim 3 is the light emitting device according to claim 2, characterized in that the content of the trifunctional polysiloxane in the mixture is 35 wt% to 70 wt%.
- the invention according to claim 4 is the light emitting device according to any one of claims 1 to 3, wherein the intermediate layer includes inorganic fine particles.
- the invention according to claim 5 is the light emitting device according to claim 4, wherein the inorganic fine particles are ZrO 2 , SiO 2 , ZnO, Al 2 O 3 or TiO 2 .
- a sixth aspect of the present invention is the light emitting device according to any one of the first to fifth aspects, wherein the intermediate layer includes a phosphor.
- the invention according to claim 7 is a coating liquid for forming an intermediate layer interposed between the light emitting element and the silicone layer in a light emitting device in which the light emitting element is covered with a silicone layer
- the coating solution is a coating solution containing a mixture of trifunctional polysiloxane and tetrafunctional polysiloxane.
- the invention described in claim 8 is the coating liquid described in claim 7, characterized in that the content of the trifunctional polysiloxane in the mixture is 10% by weight to 90% by weight.
- the invention according to claim 9 is the coating liquid according to claim 8, characterized in that the content of the trifunctional polysiloxane in the mixture is 35% by weight to 70% by weight.
- the invention according to claim 10 is the coating liquid according to any one of claims 7 to 9, characterized in that it contains inorganic fine particles.
- the invention according to claim 11 is the coating liquid according to claim 10, wherein the inorganic fine particles are ZrO 2 , SiO 2 , ZnO, Al 2 O 3 or TiO 2 .
- An invention according to claim 12 is the coating liquid according to any one of claims 7 to 11, characterized in that it contains a phosphor.
- a light-emitting device in which the light-emitting element is covered with a silicone layer, it has corrosion resistance and adhesion to the silicone layer between the light-emitting element and the silicone layer, and can prevent cracking during firing.
- An intermediate layer can be formed.
- the light emitting device 100 includes an LED substrate 1 having a concave cross section.
- a metal portion 2 is provided in a concave portion (bottom portion) of the LED substrate 1, and a rectangular parallelepiped LED element 3 is disposed on the metal portion 2.
- the LED element 3 is an example of a light emitting element that emits light of a predetermined wavelength.
- a protruding electrode 4 is provided on the surface of the LED element 3 facing the metal portion 2, and the metal portion 2 and the LED element 3 are connected via the protruding electrode 4 (flip chip type).
- a configuration in which one LED element 3 is provided for one LED substrate 1 is illustrated, but a plurality of LED elements 3 may be provided in a concave portion of one LED substrate 1.
- a blue LED element is used as the LED element 3.
- the blue LED element is formed, for example, by laminating an n-GaN-based cladding layer, an InGaN light-emitting layer, a p-GaN-based cladding layer, and a transparent electrode on a sapphire substrate.
- the intermediate layer 5 is formed in the recess of the LED substrate 1 so as to seal the periphery of the LED element 3.
- the intermediate layer 5 is a translucent thin film configured as a translucent ceramic layer (hereinafter referred to as a transparent ceramic layer).
- the thickness of the intermediate layer 5 is preferably 0.1 to 20 ⁇ m, more preferably 0.5 to 10 ⁇ m, and still more preferably 1 to 5 ⁇ m.
- the intermediate layer 5 may be configured to be provided only on the upper surface and the side surface of the LED element 3.
- a method of providing the intermediate layer 5 only around the LED element 3 a method of installing a mask when the intermediate layer 5 is formed is used.
- the intermediate layer 5 is a transparent formed by a so-called sol-gel method in which a sol-like mixed liquid (hereinafter referred to as a ceramic precursor liquid) in which a transparent resin material and an organic solvent are mixed is heated to a gel state and further baked. It is a ceramic layer (glass body). Further, the intermediate layer 5 may contain inorganic fine particles in the transparent ceramic layer. In addition to these, the transparent ceramic layer may contain a phosphor and a layered silicate mineral (layered clay mineral).
- Transparent resin material As the transparent resin material in the present invention, a mixture of trifunctional polysiloxane and tetrafunctional polysiloxane is used.
- the trifunctional polysiloxane is silsesquioxane represented by a composition formula (R—SiO 3/2) n.
- the tetrafunctional polysiloxane is represented by a composition formula (SiO4 / 2) n.
- “R” represents an organic group.
- the organic group “R” for example, those to which a hydrocarbon group such as a methyl group, an ethyl group, or a phenyl group is added are used.
- This transparent resin material corresponds to a “mixture”.
- Silsesquioxane includes cage, ladder, and random three-dimensional structures.
- a silsesquioxane having a cage structure having fastness is used as the transparent resin material of the present embodiment.
- Sesquioxane is expressed as a T8 structure.
- the silicon atoms form a skeleton of a triangular prism, a pentagonal column, a hexagonal column, and a heptagonal column, respectively.
- the phosphor is excited by the emitted light from the LED element 3 and emits fluorescence having a wavelength different from the wavelength of the emitted light.
- a YAG (yttrium aluminum garnet) phosphor that is excited by blue light (wavelength 420 nm to 485 nm) emitted from a blue LED element and emits yellow light (wavelength 550 nm to 650 nm) is used. .
- a YAG phosphor In order to produce such a YAG phosphor, first, an oxide of Y, Gd, Ce, Sm, Al, La, Ga, or a compound that easily becomes an oxide at a high temperature is used, and these are stoichiometrically converted. Thorough mixing is performed at a theoretical ratio to obtain a mixed raw material. Alternatively, a coprecipitated oxide obtained by firing a solution obtained by coprecipitation of oxalic acid from a solution obtained by dissolving rare earth elements of Y, Gd, Ce, and Sm in an acid at a stoichiometric ratio with aluminum oxide and gallium oxide Mix to obtain a mixed raw material.
- an appropriate amount of fluoride such as ammonium fluoride is mixed with the obtained mixed raw material as a flux and pressed to obtain a molded body.
- the obtained molded body is packed in a crucible and fired in air at a temperature range of 1350 to 1450 ° C. for 2 to 5 hours to obtain a sintered body having phosphor emission characteristics.
- the YAG phosphor is used.
- the type of the phosphor is not limited to this.
- other phosphors such as non-garnet phosphor and silicate not containing Ce are used. You can also
- the inorganic fine particles have an effect of improving the adhesion between the transparent resin material and the silicone sealant and a film reinforcing effect of improving the film strength of the transparent ceramic layer after heating.
- the inorganic fine particles used in the present invention include oxide fine particles such as silicon oxide (SiO 2 ), titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), zinc oxide (ZnO), aluminum oxide (Al 2 O 3), fluoride Examples include fluoride fine particles such as magnesium. In particular, it is preferable to use fine particles of silicon oxide from the viewpoint of stability with respect to the formed transparent ceramic layer.
- the content of the inorganic fine particles in the transparent ceramic layer is less than 5% by weight, the above-described effects cannot be sufficiently obtained.
- the content of the inorganic fine particles exceeds 70% by weight, the strength of the transparent ceramic layer formed by heating decreases. Therefore, the content of the inorganic fine particles in the transparent ceramic layer is preferably 5% by weight or more and 70% by weight or less, and more preferably 5% by weight or more and 60% by weight or less.
- the average particle diameter of the inorganic fine particles is measured, for example, by a Coulter counter method.
- Coating solution As described above, by applying a coating solution prepared by mixing inorganic fine particles to a ceramic precursor solution in which a transparent resin material is mixed with an organic solvent (diluted) and applying it to a place where the intermediate layer 5 is to be formed, and heating. The intermediate layer 5 having translucency is formed.
- organic solvent those having excellent compatibility with added water and having a boiling point of 100 ° C. or less are preferably used.
- aliphatic hydrocarbons, aromatic hydrocarbons, halogen hydrocarbons, ethers, esters, alcohols, ketones and the like can be used.
- methyl ethyl ketone, tetrahydrofuran, benzene, chloroform, ethyl ether, isopropyl ether, dibutyl ether, ethyl butyl ether, methanol, ethanol, isopropyl alcohol, and acetone are used.
- a thin film of a transparent ceramic layer to be the intermediate layer 5 is formed by the coating liquid produced with the above composition. Although it does not restrict
- the coating liquid is applied using a spray device, but may be applied using other devices such as various coaters.
- specific shapes, arrangements, numerical values, and the like of the light-emitting devices described in the above embodiments can be changed as appropriate without departing from the spirit of the present invention.
- the intermediate layer 5 is sealed with a silicone resin (that is, covered with a silicone layer). Thereby, the time-dependent degradation of the intermediate
- Examples 1-1 to 1-9 were generated as samples in which the composition of the coating solution was changed. Evaluation of “corrosion prevention evaluation”, “adhesion evaluation”, and “evaluation of crack” was performed.
- Examples 1-1 to 1-9 are samples in which the ratio of each mixture of a trifunctional polysiloxane and a tetrafunctional polysiloxane was changed.
- Examples 2-1 to 2-6 are samples in which inorganic fine particles are added in addition to the change in the ratio of trifunctional polysiloxane and tetrafunctional polysiloxane.
- Comparative Examples 1 to 3 were generated as comparison targets with each sample.
- the comparative example 1 has shown the sample at the time of performing only silicone sealing, without using this coating liquid (namely, without forming the intermediate
- Comparative Examples 2 and 3 show samples in which only one of trifunctional polysiloxane and tetrafunctional polysiloxane is used.
- FIG. 2 is a table showing the evaluation results of Examples 1-1 to 1-9 and Examples 2-1 to 2-6.
- the light emitting device 100 is prepared for each example, and this is put in an environment of 10 to 15 ppm hydrogen sulfide, a temperature of 25 ° C., and a humidity of 75% RH for 504 hours. At this time, the total luminous flux value was measured before and after the insertion, and the ratio of the total luminous flux values before and after the insertion was used as an evaluation index. The total luminous flux was measured with a spectral radiance meter CS-2000 (manufactured by Konica Minolta Sensing).
- the coating solution was applied on a glass plate by spin coating for each example, heated at 150 ° C. for 1 hour, then coated with a silicone resin with an applicator, and further heated at 150 ° C. for 1 hour. This was used as a sample. These samples are subjected to 100 cycles in a heat shock tester with a total of 1 hour as one cycle at 100 ° C. for 30 minutes and ⁇ 40 ° C. for 30 minutes. Thereafter, 100 squares were cut into a grid pattern, and a peel test was performed on each sample using a Nichiban tape, and the number of peeled pieces was evaluated in five stages. Rank 5 has no peeling. Rank 4 is 1-5 peels.
- Rank 3 has 6 to 10 peels. Rank 2 is more than 11 pieces. Rank 1 was all peeled off. In this evaluation, when the rank of the evaluation is rank 4, “ ⁇ ”, when the rank is 4 and 3, “ ⁇ ”, and rank 2 or less are “x”. Note that rank 3 or higher indicates a level where there is no practical problem.
- crack evaluation In the crack evaluation, 100 samples of the coating solution were applied on a glass plate for each example, and this was heated at 150 ° C. for 1 hour to evaluate the occurrence rate of cracks. In this evaluation, if the crack occurrence rate is 0%, rank 5; if greater than 0% and less than 5%, rank 4; rank 5% to less than 10%, rank 3; rank 10% to less than 20%, rank 2. 20% or more was ranked 1. In addition, when the rank of evaluation is rank 5, “ ⁇ ”, when rank 4 and 3, rank “ ⁇ ”, and rank 2 and below are “x”. Note that rank 3 or higher indicates a level where there is no practical problem.
- Comparative Example 1 The comparative example 1 has shown the sample at the time of performing only silicone sealing, without using the coating liquid which concerns on this invention. Specifically, the intermediate layer 5 was not formed on the LED element 3 but sealed with silicone containing a phosphor and heated at 150 ° C. for 1 hour as an evaluation target. As shown in FIG. 2, the result of the anticorrosion evaluation of Comparative Example 1 is 50% ( ⁇ ). Further, the result of the crack evaluation is rank 5 ( ⁇ ). In Comparative Example 1, since the intermediate layer 5 is not formed, the adhesion evaluation is not performed.
- Comparative Example 2 shows a case where tetrafunctional polysiloxane is used instead of the coating solution according to the present invention. Specifically, the tetrafunctional polysiloxane is applied onto the LED element 3 with a spray coater so that the film thickness after drying is 1 ⁇ m, and heated at 150 ° C. for 1 hour. After heating, sealing was performed with silicone containing a phosphor, and heating was performed at 150 ° C. for 1 hour. As shown in FIG. 2, the result of the anticorrosion evaluation of Comparative Example 2 is 95% ( ⁇ ), and the result of the adhesion evaluation is rank 5 ( ⁇ ). From this, it can be seen that the corrosion resistance is improved as compared with Comparative Example 1. However, the result of crack evaluation is rank 1 (x), and cracks are likely to occur.
- Comparative Example 3 shows a case where trifunctional polysiloxane is used instead of the coating solution according to the present invention. Specifically, trifunctional polysiloxane is applied onto the LED element 3 with a spray coater so that the film thickness after drying becomes 1 ⁇ m, and heated at 150 ° C. for 1 hour. After heating, sealing was performed with silicone containing a phosphor, and heating was performed at 150 ° C. for 1 hour. As shown in FIG. 2, the result of the anticorrosion evaluation of Comparative Example 3 is 75% (x), and the result of the adhesion evaluation is rank 2 (x). From this, it can be seen that the anticorrosion and adhesion are reduced as compared with Comparative Example 2. On the other hand, the result of the crack evaluation is rank 5 ( ⁇ ), and it can be seen that cracks are less likely to occur compared to Comparative Example 2.
- Example 1-1 Next, Example 1-1 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 10% by weight of trifunctional polysiloxane and 90% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- This coating solution is applied onto the LED element 3 with a spray coater so that the film thickness after drying is 1 ⁇ m, and heated at 150 ° C. for 1 hour. After heating, sealing was performed with silicone containing a phosphor, and heating was performed at 150 ° C. for 1 hour.
- the result of the anticorrosion evaluation of this example is 94% ( ⁇ ).
- the result of adhesive evaluation is rank 4 ((circle)).
- the result of crack evaluation is rank 3 ((circle)).
- Example 1-2 Next, Example 1-2 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 20% by weight of trifunctional polysiloxane and 80% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the anticorrosion evaluation of this example is 93% ( ⁇ ).
- the result of adhesive evaluation is rank 4 ((circle)).
- the result of crack evaluation is rank 4 ((circle)).
- Example 1-3 Next, Example 1-3 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 30% by weight of trifunctional polysiloxane and 70% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the corrosion resistance evaluation of this example is 95% (%).
- the result of adhesive evaluation is rank 4 ((circle)).
- the result of crack evaluation is rank 4 ((circle)).
- Example 1-4 a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 35% by weight of trifunctional polysiloxane and 65% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the anticorrosion evaluation of this example is 96% ( ⁇ ).
- the result of adhesive evaluation is rank 4 ((circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- Example 1-5 Next, Example 1-5 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 40% by weight of trifunctional polysiloxane and 60% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the corrosion resistance evaluation of this example is 97% (%).
- the result of adhesive evaluation is rank 4 ((circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- Example 1-6 a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 45% by weight of trifunctional polysiloxane and 55% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- a coating solution was produced.
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the anticorrosion evaluation of this example is 96% ( ⁇ ).
- the result of adhesive evaluation is rank 4 ((circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- Example 1-7 Next, Example 1-7 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane was produced at a ratio of 70% by weight of trifunctional polysiloxane and 30% by weight of tetrafunctional polysiloxane, and this mixed liquid was used in the present invention.
- Such a coating solution was produced.
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the anticorrosion evaluation of this example is 94% ( ⁇ ).
- the result of adhesive evaluation is rank 4 ((circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- Example 1-8 Next, Example 1-8 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 80% by weight of trifunctional polysiloxane and 20% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the anticorrosion evaluation of this example is 90% ( ⁇ ).
- the result of adhesive evaluation is rank 4 ((circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- Example 1-9 Next, Example 1-9 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 90% by weight of trifunctional polysiloxane and 10% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the anticorrosion evaluation of this example is 90% ( ⁇ ).
- the result of adhesive evaluation is rank 4 ((circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- the content of the trifunctional polysiloxane in the mixed liquid of the trifunctional polysiloxane and the tetrafunctional polysiloxane is set to 10% by weight to 90% by weight.
- the corrosion resistance and adhesion are improved as compared with the case of using only trifunctional polysiloxane.
- by setting the content of trifunctional polysiloxane in the mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane to 35% by weight to 45% by weight, in addition to improving corrosion resistance and adhesion, cracks during firing are reduced. The occurrence rate can be reduced.
- Example 2-1 Next, Example 2-1 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 20% by weight of trifunctional polysiloxane and 80% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- Example 2-2 Next, Example 2-2 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 30% by weight of trifunctional polysiloxane and 70% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- TiO 2 titanium oxide
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the anticorrosion evaluation of this example is 96% ( ⁇ ).
- the result of adhesive evaluation is rank 5 ((double-circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- Example 2-3 a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 40% by weight of trifunctional polysiloxane and 60% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention. Such a coating solution was produced.
- zircon oxide ZrO 2
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the corrosion resistance evaluation of this example is 97% (%).
- the result of adhesive evaluation is rank 5 ((double-circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- Example 2-4 Next, Example 2-4 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 80% by weight of trifunctional polysiloxane and 20% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the anticorrosion evaluation of this example is 96% ( ⁇ ).
- the result of adhesive evaluation is rank 5 ((double-circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- Example 2--5 Next, Example 2-5 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 80% by weight of trifunctional polysiloxane and 20% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- the coating solution As inorganic fine particles, 30% by weight of zinc oxide (ZnO) is added to the coating solution as inorganic fine particles.
- ZnO zinc oxide
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the corrosion resistance evaluation of this example is 95% (%).
- the result of adhesive evaluation is rank 5 ((double-circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- Example 2-6 Next, Example 2-6 will be described.
- a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane is produced at a ratio of 80% by weight of trifunctional polysiloxane and 20% by weight of tetrafunctional polysiloxane, and this mixed liquid is used in the present invention.
- Such a coating solution was produced.
- the generation method of the evaluation object is the same as that of Example 1-1.
- the result of the anticorrosion evaluation of this example is 96% ( ⁇ ).
- the result of adhesive evaluation is rank 5 ((double-circle)).
- the result of the crack evaluation is rank 5 ( ⁇ ).
- Example 3-1 chromaticity variation based on the presence or absence of the intermediate layer 5 was evaluated using Example 3-1 according to the present invention and Comparative Example 4 to be compared.
- the conditions of Example 3-1 and Comparative Example 4 and the evaluation results are summarized below.
- Example 3-1 First, the liquid mixture which mixed phosphor 1g, IPA 4.4g, and silica (SiO2) 2.2g was produced
- the comparative example 4 makes the sample which sealed the LED element 3 with the silicone containing the fluorescent substance, without forming the intermediate
- Example 3-1 and Comparative Example 4 100 samples were prepared, and chromaticity variation was evaluated. The results are summarized in FIG. FIG. 3 is a table showing the evaluation results of Example 3-1. As shown in FIG. 3, the chromaticity variation of Comparative Example 4 is 7%, whereas the chromaticity variation of Example 3-1 is 2%. From this, by forming the intermediate layer 5 using the coating liquid according to the present embodiment, it is possible to suppress the chromaticity variation lower than when the intermediate layer 5 is not provided.
- the intermediate layer 5 is formed using a coating liquid containing a mixed liquid of trifunctional polysiloxane and tetrafunctional polysiloxane.
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Abstract
Description
また、請求項2に記載の発明は、請求項1に記載の発光装置であって、前記混合物に対する前記3官能ポリシロキサンの含有率が10重量%~90重量%であることを特徴とする。
また、請求項3に記載の発明は、請求項2に記載の発光装置であって、前記混合物に対する前記3官能ポリシロキサンの含有率が35重量%~70重量%であることを特徴とする。
また、請求項4に記載の発明は、請求項1に記載の請求項1乃至請求項3のいずれか一つに記載の発光装置であって、前記中間層が、無機微粒子を含むことを特徴とする。
また、請求項5に記載の発明は、請求項4に記載の発光装置であって、前記無機微粒子が、ZrO2、SiO2、ZnO、Al2O3またはTiO2であることを特徴とする。
また、請求項6に記載の発明は、請求項1乃至請求項5のいずれか一つに記載の発光装置であって、前記中間層が、蛍光体を含むことを特徴とする。
また、請求項7に記載の発明は、発光素子がシリコーン層で覆われた発光装置において、前記発光素子と前記シリコーン層との間に介在させる中間層を形成するための塗布液であって、前記塗布液は、3官能ポリシロキサンと4官能ポリシロキサンとの混合物を含むことを特徴とする塗布液である。
また、請求項8に記載の発明は、請求項7に記載の塗布液であって、前記混合物に対する前記3官能ポリシロキサンの含有率が10重量%~90重量%であることを特徴とする。
また、請求項9に記載の発明は、請求項8に記載の塗布液であって、前記混合物に対する前記3官能ポリシロキサンの含有率が35重量%~70重量%であることを特徴とする。
また、請求項10に記載の発明は、請求項7乃至請求項9のいずれか一つに記載の塗布液であって、無機微粒子を含むことを特徴とする。
また、請求項11に記載の発明は、請求項10に記載の塗布液であって、前記無機微粒子が、ZrO2、SiO2、ZnO、Al2O3またはTiO2であることを特徴とする。
また、請求項12に記載の発明は、請求項7乃至請求項11のいずれか一つに記載の塗布液であって、蛍光体を含有することを特徴とする。
本発明における透明樹脂材料としては、3官能ポリシロキサンと4官能ポリシロキサンとの混合物が用いられる。3官能ポリシロキサンは、組成式(R-SiO3/2)nで表されるシルセスキオキサンである。また、4官能ポリシロキサンは、組成式(SiO4/2)nで表される。ここで、「R」は、有機基を示す。有機基「R」としては、例えば、メチル基やエチル基、フェニル基のような炭化水素基が付加されているものが用いられる。なお、この透明樹脂材料が「混合物」に相当する。
蛍光体は、LED素子3からの出射光により励起されて、この出射光の波長とは異なる波長の蛍光を出射するものである。本実施形態では、青色LED素子から出射される青色光(波長420nm~485nm)により励起され、黄色光(波長550nm~650nm)を出射するYAG(イットリウム・アルミニウム・ガーネット)蛍光体を使用している。
無機微粒子は、透明樹脂材料と、シリコーン封止剤との密着性向上効果及び加熱後の透明セラミック層の膜強度を向上させる膜強化効果を有する。本発明に用いられる無機微粒子としては、酸化ケイ素(SiO2)、酸化チタン(TiO2)、酸化ジルコニウム(ZrO2)、酸化亜鉛(ZnO)、酸化アルミニウム(Al2O3)等の酸化物微粒子、フッ化マグネシウム等のフッ化物微粒子等が挙げられる。特に、形成される透明セラミック層に対する安定性の観点から酸化ケイ素の微粒子を用いることが好ましい。
上記のように、透明樹脂材料を有機溶媒と混合した(希釈した)セラミック前駆体液に無機微粒子を混合することで作製した塗布液を、中間層5を形成する場所に塗布して加熱することで、透光性を有する中間層5が形成される。
防食性評価では、実施例ごとに発光装置100を作成し、これを、硫化水素10~15ppm、温度25℃、湿度75%RHの環境に504時間投入する。この際に、投入前後で全光束値を測定することで、投入前後における全光束値の比率を評価の指標とした。測定は分光放射輝度計CS-2000(コニカミノルタセンシング社製)により全光束を測定した。この評価では、投入前に対する投入後の全光束値の比率が、95%以上の場合には「◎」、90%以上95%未満の場合には「○」、90%未満を「×」としている。なお、90%以上が実用上において問題ないレベルを示している。
密着性評価では、実施例ごとに塗布液をガラス板上にスピンコートにより塗布し、これを150℃で1時間加熱したうえで、シリコーン樹脂をアプリケーターで塗布して、更に150℃で1時間加熱したものをサンプルとした。これらのサンプルに対して、ヒートショック試験器にて、100℃で30分、-40℃で30分の計1時間を1サイクルとして、100サイクルを実施する。その後、碁盤目状に100マス切れ込みをいれ、ニチバン製テープを用いて各サンプルに対して剥離試験を実施し、剥がれた個数で5段階で評価を実施した。ランク5は全く剥がれなし。ランク4は1~5個の剥がれ。ランク3は6~10個の剥がれ。ランク2は11個以上の剥がれ。ランク1は全部剥がれたものとした。この評価では、評価のランクが、ランク4の場合には「◎」、ランク4及び3の場合には「○」、ランク2以下を「×」としている。なお、ランク3以上が実用上において問題ないレベルを示している。
クラック評価では、実施例ごとに塗布液を100サンプルずつガラス板上に塗布し、これを150℃で1時間加熱して、クラックの発生率を評価した。この評価では、クラックの発生率が0%の場合をランク5、0%より大きく5%未満の場合をランク4、5%以上10%未満をランク3、10%以上20%未満をランク2、20%以上をランク1とした。そのうえで、評価のランクが、ランク5の場合には「◎」、ランク4及び3の場合には「○」、ランク2以下を「×」としている。なお、ランク3以上が実用上において問題ないレベルを示している。
比較例1は、本発明に係る塗布液を用いずシリコーン封止のみを行った場合のサンプルを示している。具体的には、LED素子3上に中間層5を形成せずに、蛍光体を含有したシリコーンで封止を行い、150℃で1時間加熱を行ったものを評価対象とした。図2に示すように、比較例1の防食性評価の結果は50%(×)である。また、クラック評価の結果はランク5(◎)である。なお、比較例1では、中間層5が形成されないため、密着性評価は行っていない。
比較例2は、本発明に係る塗布液に替えて、4官能ポリシロキサンを用いた場合を示している。具体的には、4官能ポリシロキサンを、乾燥後の膜厚が1μmとなるようにスプレー塗布機にてLED素子3上に塗布し、150℃で1時間加熱を行う。加熱後に蛍光体を含有するシリコーンにて封止を行い、150℃で1時間加熱を行ったものを評価対象とした。図2に示すように比較例2の防食性評価の結果は95%(◎)であり、密着性評価の結果はランク5(◎)である。このことから、比較例1に比べて防食性が向上していることがわかる。しかしながら、クラック評価の結果は、ランク1(×)であり、クラックが発生しやすくなっている。
比較例3は、本発明に係る塗布液に替えて、3官能ポリシロキサンを用いた場合を示している。具体的には、3官能ポリシロキサンを、乾燥後の膜厚が1μmとなるようにスプレー塗布機にてLED素子3上に塗布し、150℃で1時間加熱を行う。加熱後に蛍光体を含有するシリコーンにて封止を行い、150℃で1時間加熱を行ったものを評価対象とした。図2に示すように比較例3の防食性評価の結果は75%(×)であり、密着性評価の結果はランク2(×)である。このことから、比較例2に比べて防食性及び密着性が低下していることがわかる。反面、クラック評価の結果は、ランク5(◎)であり、比較例2に比べてクラックが発生しにくくなっていることがわかる。
次に、実施例1-1について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを10重量%、4官能ポリシロキサン90重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。この塗布液を、乾燥後の膜厚が1μmとなるようにスプレー塗布機にてLED素子3上に塗布し、150℃で1時間加熱を行う。加熱後に蛍光体を含有するシリコーンにて封止を行い、150℃で1時間加熱を行ったものを評価対象とした。図2に示すように、本実施例の防食性評価の結果は94%(○)である。また、密着性評価の結果はランク4(○)である。また、クラック評価の結果はランク3(○)である。
次に、実施例1-2について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを20重量%、4官能ポリシロキサン80重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。なお評価対象の生成方法は実施例1-1と同様である。図2に示すように、本実施例の防食性評価の結果は93%(○)である。また、密着性評価の結果はランク4(○)である。また、クラック評価の結果はランク4(○)である。
次に、実施例1-3について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを30重量%、4官能ポリシロキサン70重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。なお評価対象の生成方法は実施例1-1と同様である。図2に示すように、本実施例の防食性評価の結果は95%(◎)である。また、密着性評価の結果はランク4(○)である。また、クラック評価の結果はランク4(○)である。
次に、実施例1-4について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを35重量%、4官能ポリシロキサン65重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。なお評価対象の生成方法は実施例1-1と同様である。図2に示すように、本実施例の防食性評価の結果は96%(◎)である。また、密着性評価の結果はランク4(○)である。また、クラック評価の結果はランク5(◎)である。
次に、実施例1-5について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを40重量%、4官能ポリシロキサン60重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。なお評価対象の生成方法は実施例1-1と同様である。図2に示すように、本実施例の防食性評価の結果は97%(◎)である。また、密着性評価の結果はランク4(○)である。また、クラック評価の結果はランク5(◎)である。
次に、実施例1-6について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを45重量%、4官能ポリシロキサン55重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。なお評価対象の生成方法は実施例1-1と同様である。図2に示すように、本実施例の防食性評価の結果は96%(◎)である。また、密着性評価の結果はランク4(○)である。また、クラック評価の結果はランク5(◎)である。
次に、実施例1-7について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを70重量%、4官能ポリシロキサン30重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。なお評価対象の生成方法は実施例1-1と同様である。図2に示すように、本実施例の防食性評価の結果は94%(○)である。また、密着性評価の結果はランク4(○)である。また、クラック評価の結果はランク5(◎)である。
次に、実施例1-8について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを80重量%、4官能ポリシロキサン20重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。なお評価対象の生成方法は実施例1-1と同様である。図2に示すように、本実施例の防食性評価の結果は90%(○)である。また、密着性評価の結果はランク4(○)である。また、クラック評価の結果はランク5(◎)である。
次に、実施例1-9について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを90重量%、4官能ポリシロキサン10重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。なお評価対象の生成方法は実施例1-1と同様である。図2に示すように、本実施例の防食性評価の結果は90%(○)である。また、密着性評価の結果はランク4(○)である。また、クラック評価の結果はランク5(◎)である。
次に、実施例2-1について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを20重量%、4官能ポリシロキサン80重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。
次に、実施例2-2について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを30重量%、4官能ポリシロキサン70重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。
次に、実施例2-3について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを40重量%、4官能ポリシロキサン60重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。
次に、実施例2-4について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを80重量%、4官能ポリシロキサン20重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。
次に、実施例2-5について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを80重量%、4官能ポリシロキサン20重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。
次に、実施例2-6について説明する。本実施例では、3官能ポリシロキサン及び4官能ポリシロキサンの混合液を、3官能ポリシロキサンを80重量%、4官能ポリシロキサン20重量%の割合で生成し、この混合液を用いて本発明に係る塗布液を生成した。
まず、蛍光体1gと、IPA4.4gと、シリカ(SiO2)2.2gを混合した混合液を生成し、これを、乾燥後の膜厚が35μmとなるようにスプレー塗布機にてLED素子3上に塗布して、150℃で1時間加熱した。その後、3官能ポリシロキサン20gと4官能ポリシロキサン30gの混合液を、乾燥後の膜厚が8μmとなるようにスプレー塗布機にて塗布して、150℃で1時間加熱した。このようにして、LED素子3上に中間層5を形成した。なお、中間層5の形成後に、シリコーンにて封止を行い150℃で1時間加熱を行い、これをサンプルとした。
2 メタル部
3 LED素子
4 突起電極
5 中間層
100 発光装置
Claims (12)
- 発光素子がシリコーン層で覆われた発光装置であって、
前記発光素子と前記シリコーン層との間に介在する中間層を有し、
前記中間層は、
3官能ポリシロキサンと4官能ポリシロキサンとの混合物で形成されることを特徴とする発光装置。 - 前記混合物に対する前記3官能ポリシロキサンの含有率が10重量%~90重量%であることを特徴とする請求項1に記載の発光装置。
- 前記混合物に対する前記3官能ポリシロキサンの含有率が35重量%~70重量%であることを特徴とする請求項2に記載の発光装置。
- 前記中間層が、無機微粒子を含むことを特徴とする請求項1乃至請求項3のいずれか一つに記載の発光装置。
- 前記無機微粒子が、ZrO2、SiO2、ZnO、Al2O3またはTiO2であることを特徴とする請求項4に記載の発光装置。
- 前記中間層が、蛍光体を含むことを特徴とする請求項1乃至請求項5のいずれか一つに記載の発光装置。
- 発光素子がシリコーン層で覆われた発光装置において、前記発光素子と前記シリコーン層との間に介在させる中間層を形成するための塗布液であって、
前記塗布液は、
3官能ポリシロキサンと4官能ポリシロキサンとの混合物を含むことを特徴とする塗布液。 - 前記混合物に対する前記3官能ポリシロキサンの含有率が10重量%~90重量%であることを特徴とする請求項7に記載の塗布液。
- 前記混合物に対する前記3官能ポリシロキサンの含有率が35重量%~70重量%であることを特徴とする請求項8に記載の塗布液。
- 無機微粒子を含むことを特徴とする請求項7乃至請求項9のいずれか一つに記載の塗布液。
- 前記無機微粒子が、ZrO2、SiO2、ZnO、Al2O3またはTiO2であることを特徴とする請求項10に記載の塗布液。
- 蛍光体を含有することを特徴とする請求項7乃至請求項11のいずれか一つに記載の塗布液。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/348,716 US9172009B2 (en) | 2011-09-30 | 2012-09-24 | Light-emitting device having an interlayer of a polysiloxane mixture |
| JP2013536249A JP5842922B2 (ja) | 2011-09-30 | 2012-09-24 | 発光装置及び塗布液 |
| KR1020147011136A KR101585814B1 (ko) | 2011-09-30 | 2012-09-24 | 발광 장치 및 도포액 |
| EP12836596.2A EP2763198A4 (en) | 2011-09-30 | 2012-09-24 | LIGHT-EMITTING DEVICE AND COATING LIQUID |
| CN201280047413.4A CN103858245A (zh) | 2011-09-30 | 2012-09-24 | 发光装置及涂布液 |
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| JP2011-216285 | 2011-09-30 | ||
| JP2011216285 | 2011-09-30 |
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| PCT/JP2012/074337 Ceased WO2013047407A1 (ja) | 2011-09-30 | 2012-09-24 | 発光装置及び塗布液 |
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| Country | Link |
|---|---|
| US (1) | US9172009B2 (ja) |
| EP (1) | EP2763198A4 (ja) |
| JP (1) | JP5842922B2 (ja) |
| KR (1) | KR101585814B1 (ja) |
| CN (1) | CN103858245A (ja) |
| WO (1) | WO2013047407A1 (ja) |
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| ES2072351T3 (es) | 1990-01-09 | 1995-07-16 | Rxs Schrumpftech Garnituren | Procedimiento para la fabricacion de un forro de control del campo para guarniciones de cable para tension media. |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20140070626A (ko) | 2014-06-10 |
| JPWO2013047407A1 (ja) | 2015-03-26 |
| KR101585814B1 (ko) | 2016-01-14 |
| CN103858245A (zh) | 2014-06-11 |
| EP2763198A4 (en) | 2015-07-08 |
| JP5842922B2 (ja) | 2016-01-13 |
| US20140239335A1 (en) | 2014-08-28 |
| US9172009B2 (en) | 2015-10-27 |
| EP2763198A1 (en) | 2014-08-06 |
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