Light emission device
First Claim
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1. A light emitting apparatus comprising:
- a semiconductor light emitting element; and
a transparent ceramic phosphor for converting a wavelength of a light emitted from the semiconductor light emitting element, whereinsaid ceramic phosphor has a relative density of 99.50 to 99.98% and has at least a part of the surface of which average surface roughness is 0.5 to 150 μ
m in terms of arithmetical average surface roughness Ra,the semiconductor light emitting element emits an ultraviolet light, andthe ceramic phosphor corresponding to the semiconductor light emitting element has;
a minimum transmission of 0.1 to 40% under a wavelength of 350-420 nm; and
a transmission of 10 to 90% under an emission peak wavelength of the ceramic phosphor; and
wherein the ceramic phosphor is composed of at least one compound selected from the group consisting of silicate, aluminate, phosphate, halo-phosphate, borate, oxide, tungstate, salt of vanadic acid, oxysulfide, sulfide, nitride and oxynitride.
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Abstract
The present invention relates to a light emitting apparatus including a semiconductor light emitting element and a transparent ceramic phosphor for converting a wavelength of a light emitted from the semiconductor light emitting element, wherein the semiconductor light emitting element emits an ultraviolet light, and the ceramic phosphor corresponding to the semiconductor light emitting element has (i) a minimum transmission of 0.1 to 40% under a wavelength of 350-420 nm and (ii) a transmission of 10 to 90% under an emission peak wavelength of the ceramic phosphor.
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Citations
20 Claims
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1. A light emitting apparatus comprising:
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a semiconductor light emitting element; and a transparent ceramic phosphor for converting a wavelength of a light emitted from the semiconductor light emitting element, wherein said ceramic phosphor has a relative density of 99.50 to 99.98% and has at least a part of the surface of which average surface roughness is 0.5 to 150 μ
m in terms of arithmetical average surface roughness Ra,the semiconductor light emitting element emits an ultraviolet light, and the ceramic phosphor corresponding to the semiconductor light emitting element has; a minimum transmission of 0.1 to 40% under a wavelength of 350-420 nm; and a transmission of 10 to 90% under an emission peak wavelength of the ceramic phosphor; and wherein the ceramic phosphor is composed of at least one compound selected from the group consisting of silicate, aluminate, phosphate, halo-phosphate, borate, oxide, tungstate, salt of vanadic acid, oxysulfide, sulfide, nitride and oxynitride. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light emitting apparatus comprising:
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a semiconductor light emitting element; and a transparent ceramic phosphor for converting a wavelength of a light emitted from the semiconductor light emitting element, wherein said ceramic phosphor has a relative density of 99.50 to 99.98% and has at least a part of the surface of which average surface roughness is 0.5 to 150 μ
m in terms of arithmetical average surface roughness Ra,the semiconductor light emitting element emits a blue light, and the ceramic phosphor corresponding to the semiconductor light emitting element has; a minimum transmission of 20 to 80% under a wavelength of 420-500 nm; and a transmission of 10 to 90% under an emission peak wavelength of the ceramic phosphor; and wherein the ceramic phosphor is composed of at least one compound selected from the group consisting of silicate, aluminate, phosphate, halo-phosphate, borate, oxide, tungstate, salt of vanadic acid, oxysulfide, sulfide, nitride and oxynitride. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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Current AssigneeSeoul Semiconductor Co., Ltd.
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Original AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Materials Company Limited (Toshiba Corporation)
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InventorsTamatani, Masaaki, Ootsuka, Kazuaki, Okamura, Masami, Fukuta, Yukihiro, Shida, Naomi
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Primary Examiner(s)Landau; Matthew C
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Assistant Examiner(s)Hall; Jessica
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Application NumberUS11/817,504Publication NumberTime in Patent Office1,874 DaysField of Search257/98, 257/E33.067, 257/E33.074, 257/E33.061, 438/27, 438/29, 313502-504US Class Current257/98CPC Class CodesH01L 2224/48091 ArchedH01L 2224/73265 Layer and wire connectorsH01L 2924/00014 the subject-matter covered ...H01L 33/502 Wavelength conversion mater...
