KR100549902B1 - 발광장치 - Google Patents
발광장치 Download PDFInfo
- Publication number
- KR100549902B1 KR100549902B1 KR1020027001340A KR20027001340A KR100549902B1 KR 100549902 B1 KR100549902 B1 KR 100549902B1 KR 1020027001340 A KR1020027001340 A KR 1020027001340A KR 20027001340 A KR20027001340 A KR 20027001340A KR 100549902 B1 KR100549902 B1 KR 100549902B1
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- South Korea
- Prior art keywords
- light emitting
- light
- phosphor
- emitting element
- wavelength
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 255
- 239000004065 semiconductor Substances 0.000 claims abstract description 88
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 33
- -1 gallium nitride compound Chemical class 0.000 claims abstract description 24
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims abstract description 22
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- 238000000295 emission spectrum Methods 0.000 claims description 38
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 claims description 35
- 229910052727 yttrium Inorganic materials 0.000 claims description 35
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 34
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- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 5
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7767—Chalcogenides
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7774—Aluminates
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/20—Luminescent screens characterised by the luminescent material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
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- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
- H01L2224/45001—Core members of the connector
- H01L2224/4501—Shape
- H01L2224/45012—Cross-sectional shape
- H01L2224/45015—Cross-sectional shape being circular
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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Abstract
Description
(발명의 실시형태)
발광소자(102)와 마운트 리드(105)의 컵부(105a)와의 접착은, 에폭시수지, 아크릴수지나 이미드수지 등의 열결화성 수지 등을 사용하여 접착할 수 있다. 또, 페이스 다운(face down) 발광소자{기판측에서 발광하는 타입으로서, 발광소자의 전극을 컵부(105a)에 대향시켜서 부착하도록 구성된 것}를 사용할 경우에는, 이 발광소자를 마운트 리드와 접착시킴과 아울러 전기적으로 도통시키기 위해서, Ag 페이스트, 카본 페이스트, 금속범프 등을 사용할 수 있다. 또한, 발광다이오드의 광 이용효율을 향상시키기 위해서, 발광소자가 배치되는 마운트 리드의 컵부의 표면을 경면상태로 하여, 이 표면에 반사기능을 갖게 하여도 된다. 이 경우의 표면조도는 0.1S 이상 0.8S 이하가 바람직하다. 또, 마운트 리드의 구체적인 전기저항으로서는 300μΩㆍcm 이하가 바람직하고, 보다 바람직하게는 3μΩㆍcm 이하이다. 또, 마운트 리드 상에 복수의 발광소자를 적층시킬 경우에는, 발광소자로부터의 발열량이 많아지기 때문에 열전도도가 좋은 것이 요구되며, 그 열전도도는 0.01cal/(s)(㎠)(℃/cm) 이상이 바람직하고, 보다 바람직하게는 0.5cal/(s)(㎠)(℃/cm) 이상이다. 이러한 조건을 만족하는 재료로서는 철, 구리, 철을 입힌 구리, 주석을 입힌 구리, 메탈라이드즈 세라믹(metallized ceramics) 등을 들 수 있다.
(인너 리드(106))
인너 리드(106)는 마운트 리드(105) 상에 배치된 발광소자(102)의 일측 전극에 도전성 와이어 등에 의해서 접속된다. 마운트 리드 상에 복수의 발광소자를 설치한 발광다이오드의 경우에는, 인너 리드(106)를 복수개 설치하고, 각 도전성 와이어들이 접촉하지 않도록 각 인너 리드를 배치할 필요가 있다. 예를 들면, 마운트 리드로부터 멀어짐에 따라서 각 인너 리드에 있어서의 와이어본딩되는 각 단면의 면적을 순차적으로 크게 함으로써, 도전성 와이어간에 간격을 두도록 본딩하여 도전성 와이어간의 접촉을 방지할 수 있다. 인너 리드의 도전성 와이어에 대한 접속단면의 조도는, 밀착성을 고려하여 1.6S 이상 10S 이하로 설정하는 것이 바람직하다.
<제 2 실시형태>
본 발명에 관한 제 2 실시형태의 발광다이오드는, 발광소자로서 발광층에 고에너지 밴드 갭을 가지는 질화갈륨계 반도체를 구비한 소자를 사용하고, 포토루미네선스 형광체로서 서로 조성이 다른 2종류 이상의 포토루미네선스 형광체, 바람직하게는 세륨으로 활성화된 이트륨·알루미늄·가넷계 형광체를 함유하는 형광체를 사용한다. 따라서, 제 2 실시형태의 발광다이오드는, 발광소자에 의해서 발광되는 LED광의 발광파장이, 제조시의 편차 등에 의해서 소망하는 값으로부터 벗어난 경우에도, 2종류 이상의 형광체의 함유량을 조절함으로써 소망하는 색조를 가진 발광다이오드를 제작할 수 있다. 이 경우, 발광파장이 비교적 짧은 발광소자에 대해서는 발광파장이 비교적 짧은 형광체를 사용하고, 발광파장이 비교적 긴 발광소자에는 발광파장이 비교적 긴 형광체를 사용함으로써 발광다이오드에서 출력되는 발광색을 일정하게 할 수 있다.
형광체에 대해서 설명하면, 포토루미네선스 형광체로서 일반식 (Re1-rSmr)3(Al1-sGas)5O12:Ce로 표시되는 세륨으로 활성화된 형광체를 이용할 수도 있다. 단, 0<r≤1, 0≤s≤1, Re는 Y, Gd, La에서 선택되는 적어도 일종이다. 이것에 의해서, 발광소자로부터 방출된 가시광 대역에 있어서의 고에너지를 가지는 광이 장시간 고휘도로 조사된 경우나 여러가지 외부환경의 사용하에서도 형광체의 변질을 적게 할 수 있기 때문에, 발광색의 색 편향이나 발광휘도의 저하가 매우 적고, 또한 고휘도의 소망하는 발광성분을 가지는 발광다이오드를 구성할 수 있다.
(제 2 실시형태의 포토루미네선스 형광체)
또한, 제 2 실시형태에 사용되는 이트륨ㆍ알루미늄ㆍ가넷계(YAG계) 형광체는 가넷구조를 가지기 때문에, 제 2 실시형태의 발광다이오드는 장시간 고휘도로 발광시킬 수 있다. 또, 제 1 및 제 2 실시형태의 발광다이오드는, 발광 관측면에서 볼 때 형광체를 통해서 발광소자를 설치한다. 또, 발광소자로부터의 광보다도 더 장파장측으로 발광하는 형광물질을 사용하고 있기 때문에, 효율좋게 발광시킬 수 있다. 또한, 변환된 광은 발광소자에서 방출되는 광보다도 장파장측으로 되어 있기 때문에, 발광소자의 질화물 반도체층의 밴드 갭보다도 작고, 이 질화물 반도체층의 흡수되기 어렵다. 따라서, 형광체가 등방적으로 발광하기 때문에 발광된 광은 LED 소자로도 향하지만, 형광체에 의해서 발광된 광은 LED 소자에 흡수되는 일이 없기 때문에, 발광다이오드의 발광효율을 저하시키지는 않는다.
(평면형 발광광원)
본 발명에 관한 다른 실시형태인 평면형 발광광원의 예를 도 7에 나타낸다.
도 7에 나타낸 평면형 발광광원에서는, 제 1 또는 제 2 실시형태에서 사용한 포토루미네선스 형광체가 코팅부(701)에 함유되어 있다. 이것에 의해서, 질화갈륨계 발광소자가 발생하는 청색계의 광을 코팅부에서 색변환한 후, 도광판(704) 및 산란시트(706)를 통해서 평면형태로 출력한다.
상세하게 설명하면, 도 7의 평면형 발광광원에 있어서, 발광소자(702)는 절연층 및 도전성 패턴(도시하지 않음)이 형성된 ㄷ자 형상의 금속기판(703) 내에 고정된다. 발광소자의 전극과 도전성 패턴을 도통시킨 후, 포토루미네선스 형광체를 에폭시수지와 혼합하여 발광소자(702)가 적재되어 있는 ㄷ자 형상의 금속기판(703) 내부에 충진한다. 이와 같이 하여 고정된 발광소자(702)는, 아크릴성 도광판(704)의 일측 단면에 에폭시수지 등에 의해서 고정된다. 도광판(704)의 일측 표면에 있어서의 산란시트(706)가 형성되어 있지 않은 부분에는, 점 형상으로 발광하는 형광현상방지를 위해서 백색 산란제가 함유된 필름형상의 반사부재(707)가 형성된다.
마찬가지로, 도광판(707)의 타측 표면(이면측)의 전면 및 발광소자가 배치되어 있지 않은 타측 단면에도 반사부재(705)를 형성하여 발광효율을 향상시키도록 구성한다. 이것에 의해서, 예를 들면 LCD의 백라이트용으로서 충분한 밝기를 가지는 평면형 발광의 발광다이오드를 구성할 수 있다.
상기 평면형 발광의 발광다이오드를 사용한 액정표시장치는, 예를 들면 도광판(704)의 일측 표면에, 투광성 도전성 패턴이 형성된 유리기판(도시하지 않음) 사이에 액정이 주입된 액정장치를 통해서 편광판을 배치하여 구성한다.
본 발명에 관한 다른 실시형태인 평면형 발광장치의 예를 도 8, 도 9에 나타낸다. 도 8에 나타낸 발광장치는, 발광소자(702)가 발광하는 청색계의 광을 포토루미네선스 형광체가 함유된 색변환부재(701)를 통해서 백색계의 광으로 변환한 후, 도광판(704)에 의해서 평면형태로 출력하도록 구성되어 있다.
도 9에 나타낸 발광장치는, 발광소자(702)가 발광하는 청색계의 광을 도광판(704)에 의해서 평면형태로 한 후, 도광판(704)의 일측 표면에 형성된 포토루미네선스 형광체를 가지는 산란시트(706)에 의해서 백색광으로 변환하여 평면형의 백색광을 출력하도록 구성되어 있다. 여기서, 포토루미네선스 형광체는 산란시트(706)에 함유시켜도 되고, 또는 바인더 수지와 함께 산란시트(706)에 도포하여 시트형상으로 형성하여도 된다. 또한, 도광판(704) 상에 포토루미네선스 형광체를 함유하는 바인더를 시트형상이 아닌 도트형상으로 직접 형성하여도 된다.
도 10은 본원발명에 관한 표시장치의 구성을 나타낸 블록도이다. 이 표시장치는, 도 10에 나타낸 바와 같이, LED 표시기(601)와, 드라이버회로(602), 화상데이터 기억수단(603) 및 계조제어수단(tone control means)(604)을 구비한 구동회로 (610)로 이루어진다.
이와 같이, RGB 발광다이오드에 백색 발광다이오드를 추가함으로써, 디스플레이의 휘도를 향상시킬 수 있다. 또, RGB의 조합에 의해서 백색을 표시하려고 하면, 보는 각도에 따라서 RGB 중 어느 1개 또는 2개의 색이 강조되어 순수한 백색을 표현할 수 없으나, 본 표시장치와 같이 백색계 발광다이오드를 추가하면, 이와 같은 문제를 해결할 수 있다.
이와 같은 표시장치에 있어서의 구동회로에서는, 백색계 발광다이오드를 소망하는 휘도로 점등시키기 위한 펄스신호를 연산하는 계조제어회로로서 CPU를 별도로 구비하는 것이 바람직하다. 계조제어회로에서 출력되는 펄스신호는 백색계 발광 다이오드의 드라이버에 입력되어 드라이버를 스위칭시킨다. 드라이버가 온(ON)되면 백색계 발광다이오드가 점등되고, 오프되면 소등된다.
(신호기)
본원발명의 발광다이오드를 표시장치의 1종인 신호기에 사용한 경우, 장시간 안정하게 발광시키는 것이 가능함과 아울러, 발광다이오드의 일부가 소등되어도 색얼룩 등이 생기지 않는다는 특징이 있다.
본원발명의 발광다이오드를 사용한 신호기의 개략구성으로서, 도전성 패턴이 형성된 기판 상에 백색계 발광다이오드를 소정의 배열로 배치한다. 이와 같은 발광다이오드를 직렬 또는 직병렬로 접속한 발광다이오드의 회로를 발광다이오드군으로서 취급한다. 발광다이오드군을 2개 이상 사용하여 각각 소용돌이 형상으로 발광다이오드를 배치한다. 모든 발광다이오드가 배치되면 원형상으로 전면에 배치된다. 각 발광다이오드 및 기판에서 외부전극과 접속시키는 전원코드를 각각 납땜에 의해서 접촉한 후, 철도신호용 케이싱 내에 고정한다. LED 표시기는 차광부재가 부착된 알루미늄 다이캐스트의 케이싱 내에 배치되며, 표면이 실리콘 고무의 충진재에 의해서 밀봉되어 있다. 케이싱의 표시면은 백색 렌즈를 설치하고 있다. 또, LED 표시기의 전기적 배선은, 케이싱의 이면에서 케이싱를 밀폐하기 위해서 고무패킹을 통해서 케이싱 내를 밀폐한다. 이와 같이 하여 백색계 신호기를 형성할 수 있다.
본원발명의 발광다이오드를 복수 그룹으로 나누어 중심부에서 외측을 향해서 원을 그리는 소용돌이 형상 등으로 배치하고, 병렬 접속함으로써 보다 신뢰성 높은 신호기를 구성할 수 있다. 이 경우, 중심부에서 외측을 향해서 원을 그림으로써 신뢰성 높은 신호기를 구성할 수 있다. 중심부에서 외측을 향해서 원을 그리는 것은 연속적으로 원을 그리는 것, 단속적으로 배치하는 것 모두를 포함한다. 따라서, LED 표시기의 표시면적 등을 고려하여 배치되는 발광다이오드의 개수나 발광다이오드군의 개수를 여러가지로 선택할 수 있다. 이 신호기에 의해서, 일측의 발광다이오드군이나 일부 발광다이오드가 어떠한 트러블에 의해서 소등되었다 하더라도 타측의 발광다이오드군이나 나머지 발광다이오드에 의해서 신호기를 원형상으로 균일하게 발광시키는 것이 가능하게 되며, 색얼룩이 생기는 일도 없다. 소용돌이 형상으로 배치되어 있으므로 중심부를 조밀하게 배치할 수 있고 전구 발광의 신호도 아무런 위화감 없이 구동시킬 수 있다.
<실시예>
이하, 본원발명의 실시예에 대해서 설명한다. 또한, 본원발명은 이하에 개시하는 실시예에만 국한되는 것이 아님은 물론이다.
(제 1 실시예)
제 1 실시예는, 발광소자로서, GaInN 반도체를 사용한 발광피크가 450nm, 반치 폭(half width)이 30nm인 발광소자를 사용한 예이다. 제 1 실시예의 발광소자는 세정된 사파이어기판 상에 TMG(트리메틸갈륨)가스, TMI(트리메틸인듐)가스, 질소가스 및 도펀트가스를 캐리어가스와 함께 흐르게 하고, MOCVD법에 의해서 질화갈륨계 화합물 반도체를 성막하여 제작된다. 성막시에, 도펀트가스로서 SiH4와 Cp2Mg를 전환함에 의해서 N형 도전성을 가지는 질화갈륨 반도체와 P형 도전성을 가지는 질화갈륨 반도체를 형성한다. 제 1 실시예의 LED 소자는, N형 도전성을 가지는 질화갈륨 반도체인 콘택트층과, P형 도전성을 가지는 질화갈륨 알루미늄 반도체인 클래드층과, P형 도전성을 가지는 질화갈륨 반도체층인 콘택트층을 구비하고, N형 도전성을 가지는 콘택트층과 P형 도전성을 가지는 클래드층과의 사이에 두께 약 3nm인 단일 양자 우물구조를 구성하기 위한 언도프 InGaN으로 이루어진 활성층이 형성되어 있다. 또한, 사파이어기판 상에는 버퍼층으로서 저온에서 질화갈륨 반도체층이 형성되어 있다. 또, P형 질화갈륨 반도체는 성막후 400℃ 이상의 고온에서 어닐링되어 있다.
Claims (26)
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- 발광층이 반도체인 발광소자와, 상기 발광소자에 의해서 발광된 광의 일부를 흡수하여 흡수한 광의 파장과는 다른 파장을 가지는 광을 발광하는 포토루미네선스 형광체를 구비한 발광장치에 있어서,상기 발광소자의 발광층이 In을 포함하는 질화물계 화합물 반도체로 이루어지고, 상기 In의 함유량에 의해서 발광소자의 발광 스펙트럼의 주 피크가 400㎚에서 530㎚의 범위 내에 설정되고,상기 포토루미네선스 형광체는 Y과 Al를 함유하여 이루어지는 세륨으로 활성화된 이트륨·알루미늄·가넷계 형광체를 포함하고,또 상기 이트륨·알루미늄·가넷계 형광체는 그 Al의 일부를 Ga으로 치환 및 Y의 일부를 Gd으로 치환함으로써 주 발광파장이 상기 발광소자의 주 피크 파장보다 긴 파장으로 설정되고,상기 발광소자와 상기 포토루미네선스 형광체를 사용하여 흑체 방사 궤적을 따르는 백색광을 발광하는 것을 특징으로 하는 발광장치.
- 청구항 15에 있어서,상기 이트륨·알루미늄·가넷계 형광체는, Lu, Sc, La, Gd 및 Sm으로 이루어지는 그룹에서 선택되는 적어도 하나의 원소를 더 포함하는 것을 특징으로 하는 발광장치.
- 청구항 15에 있어서,상기 이트륨·알루미늄·가넷계 형광체는 Ga 및 In으로 이루어지는 그룹에서선택되는 적어도 하나의 원소를 더 포함하는 것을 특징으로 하는 발광장치.
- 청구항 15에 있어서,상기 이트륨·알루미늄·가넷계 형광체는 Lu, Sc, La, Gd 및 Sm으로 이루어지는 그룹에서 선택되는 적어도 하나의 원소와, Ga 및 In으로 이루어지는 그룹에서 선택되는 적어도 하나의 원소를 더 포함하는 것을 특징으로 하는 발광장치.
- 청구항 18에 있어서,상기 이트륨·알루미늄·가넷계 형광체는 Gd와 Ga를 포함하고, Y와 Gd의 비율이 Y:Gd=4:1에서 2:3의 범위 내의 비율로 설정되고, Al과 Ga의 비율이 Ga:Al=1:1에서 4:6의 범위 내의 비율이 되도록 설정되는 것을 특징으로 하는 발광장치.
- 발광층이 반도체인 발광소자와, 상기 발광소자에 의해서 발광된 광의 일부를 흡수하여 흡수한 광의 파장과는 다른 파장을 가지는 광을 발광하는 포토루미네선스 형광체를 구비한 발광장치에 있어서,상기 발광소자의 발광층은 In을 포함하는 질화물계 화합물 반도체로 이루어지고, 상기 In의 함유량에 의해서 발광소자의 발광 스펙트럼의 주 피크가 400㎚에서 530㎚의 범위 내에 설정되고,상기 포토루미네선스 형광체는 일반식 (Re1-rSmr)3(Al1-sGas)5O12:Ce (단, 0≤r<1, 0≤s≤1이고, Re는 Y, Gd으로부터 선택되는 적어도 1종이다)로 표시되는 형광체를 포함하고,또 상기 (Re1-rSmr)3(Al1-sGas)5O12:Ce 형광체의 주 발광파장을 상기 발광소자의 주 피크 파장보다 긴 파장으로 설정함으로써, 흑체 방사 궤적을 따르는 백색광을 발광하는 것을 특징으로 하는 발광장치.
- 발광층이 반도체인 발광소자와, 상기 발광소자에 의해서 발광된 광의 일부를 흡수하여 흡수한 광의 파장과는 다른 파장을 가지는 광을 발광하는 포토루미네선스 형광체를 구비한 발광장치에 있어서,상기 발광소자의 발광층은 In을 포함하는 질화물계 화합물 반도체로 이루어지고, 상기 In의 함유량에 의해서 발광소자의 발광 스펙트럼의 주 피크가 400㎚에서 530㎚의 범위 내에 설정되고,상기 포토루미네선스 형광체는 일반식 (Y1-p-q-rGdpCeqSmr)3(Al1-sGas)5O12 (단, 0≤p≤0.8, 0.003≤q≤0.2, 0.0003≤r≤0.08, 0≤s<1이다)로 표시되는 형광체를 포함하고,또, 상기 (y1-p-q-rGdpCeqSmr)3(Al1-sGas)5O12 형광체의 주 발광파장을 상기 발광소자의 주 피크 파장보다 긴 파장으로 설정함으로써, 흑체 방사 궤적을 따르는 백색광을 발광하는 것을 특징으로 하는 발광장치.
- 발광층이 반도체인 발광소자와, 상기 발광소자에 의해서 발광된 광의 일부를 흡수하여 흡수한 광의 파장과는 다른 파장을 가지는 광을 발광하는 포토루미네선스 형광체를 구비한 발광장치에 있어서,상기 발광소자의 발광층이 In을 포함하는 질화물계 화합물 반도체로 이루어지고, 상기 In의 함유량에 의해서 발광소자의 발광 스펙트럼의 주 피크가 400㎚에서 530㎚의 범위 내에 설정되고,상기 포토루미네선스 형광체는 Y과 Al를 함유하여 이루어지는 세륨으로 활성화된 이트륨·알루미늄·가넷계 형광체를 포함하고,또 상기 이트륨·알루미늄·가넷계 형광체는 그 Al의 일부를 Ga으로 치환 또는 Y의 일부를 Gd으로 치환함으로써 주 발광파장이 상기 발광소자의 주 피크 파장보다 긴 파장으로 설정되고,상기 발광소자와 상기 포토루미네선스 형광체를 사용하여 흑체 방사 궤적을 따르는 백색광을 발광하는 것을 특징으로 하는 발광장치.
- 청구항 22에 있어서,상기 이트륨·알루미늄·가넷계 형광체는, Lu, Sc, La, Gd 및 Sm으로 이루어지는 그룹에서 선택되는 적어도 하나의 원소를 더 포함하는 것을 특징으로 하는 발광장치.
- 청구항 22에 있어서,상기 이트륨·알루미늄·가넷계 형광체는 Ga 및 In으로 이루어지는 그룹에서선택되는 적어도 하나의 원소를 더 포함하는 것을 특징으로 하는 발광장치.
- 청구항 22에 있어서,상기 이트륨·알루미늄·가넷계 형광체는 Lu, Sc, La, Gd 및 Sm으로 이루어지는 그룹에서 선택되는 적어도 하나의 원소와, Ga 및 In으로 이루어지는 그룹에서 선택되는 적어도 하나의 원소를 더 포함하는 것을 특징으로 하는 발광장치.
- 청구항 25에 있어서,상기 이트륨·알루미늄·가넷계 형광체는 Gd와 Ga를 포함하고, Y와 Gd의 비율이 Y:Gd=4:1에서 2:3의 범위 내의 비율로 설정되고, Al과 Ga의 비율이 Ga:Al=1:1에서 4:6의 범위 내의 비율이 되도록 설정되는 것을 특징으로 하는 발광장치.
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JPJP-P-1996-00244339 | 1996-09-17 | ||
JPJP-P-1996-00245381 | 1996-09-18 | ||
JP24538196 | 1996-09-18 | ||
JPJP-P-1996-00359004 | 1996-12-27 | ||
JP35900496 | 1996-12-27 | ||
JP8101097 | 1997-03-31 | ||
JPJP-P-1997-00081010 | 1997-03-31 | ||
KR10-1999-7000775A KR100517271B1 (ko) | 1996-07-29 | 1997-07-29 | 발광장치와 표시장치 |
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KR10-2002-7012950A KR100491481B1 (ko) | 1996-07-29 | 1997-07-29 | 발광장치와 표시장치 |
KR1020057007162A KR100549906B1 (ko) | 1996-07-29 | 1997-07-29 | 발광장치 |
KR10-2002-7001342A KR100524117B1 (ko) | 1996-07-29 | 1997-07-29 | 발광다이오드의 제조방법 |
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KR10-1999-7000775A KR100517271B1 (ko) | 1996-07-29 | 1997-07-29 | 발광장치와 표시장치 |
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KR10-2002-7012950A KR100491481B1 (ko) | 1996-07-29 | 1997-07-29 | 발광장치와 표시장치 |
KR1020057007162A KR100549906B1 (ko) | 1996-07-29 | 1997-07-29 | 발광장치 |
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