JP2014090220A - 励起蛍光体を有する可視光出力発生用の高効率固体発光装置 - Google Patents
励起蛍光体を有する可視光出力発生用の高効率固体発光装置 Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
- H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 bodies
- H01L33/10—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 bodies with a light reflecting structure, e.g. semiconductor Bragg reflector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 coatings, e.g. passivation layer or anti-reflective coating
- H01L33/46—Reflective coating, e.g. dielectric Bragg reflector
Abstract
【解決手段】例えば反射体を蛍光体層に隣接して設けて蛍光体を通過する放射の少なくとも一部を反射させ、蛍光体に戻すことによって効率が向上される。反射体は蛍光体が発する可視光の少なくとも一部を反射して指定された光出力の方向に向わせる。他にまたは付加的に、放射源の能動領域の側方縁を可視光発生蛍光体と反射体とで少なくとも部分的に取り囲み得る。これは放射を更に相互作用させ、蛍光体材料を励起して、装置の効率を更に向上する。反射体はまた隣接する発光装置間の光学的、放射漏出を減じ得る。
【選択図】図1
Description
本発明は発光装置、特に一種以上の蛍光又は燐光体(以下、便宜上、総称して蛍光体と称す)を励起して光出力を発生するディスプレー用等の発光装置に関する。また、以下の説明においては、蛍光又は燐光物質を便宜上、総称して蛍光物質と称す。
本発明は蛍光体を励起して可視光出力を発生する更に効率の良い固体発光装置を提供して従来技術の多くの不利点を克服する。これを達成するために本発明は蛍光体層に隣接して反射体を設け蛍光体を通過するUV放射の少なくとも一部を反射させて蛍光体内に戻すことを企図する。反射体はまた蛍光体が発生した可視光の少なくとも一部を所望の可視光出力に向けて反射させる。他の実施形態では反射源を少なくとも部分的に可視光発生蛍光体によって包囲する。この形態は活性領域から発した更なる放射が蛍光体材料に到達してこれと相互作用する。
図1は1以上の励起可能で可視光線を発光する蛍光物質を有する固体UV光発光ダイオード(LED)(UV・LED)の一部を切り開いて示す斜視図である。UV・LEDはP−AlGaN層20、N−AlGaN層22及びその間に配設される活性領域24とで構成される。活性領域24は以下に詳述するが、GaN・AalGaNダブルヘテロ構造体あるいは複数の量子井戸を含む。UV・LEDは好ましくはサファイア等から作られた透明な基板26上に成長される。好ましい実施形態においてN−AlGaN層22、活性領域24、ビアP−AlGaN層20の一部はエッチングされて除去され、側壁34A、34Bが形成される。
Claims (12)
- 発光装置であって、
第1の接触領域(20)と、第2の接触領域(22)と、前記第1の接触領域(20)と第2の接触領域(22)との間にあり、前記第1の接触領域(20)と第2の接触領域(22)との間に電圧が印加されることにより放射を提供する活性領域(24)とを有する放射源であって、前記放射源は、上面と、底面と、上面及び底面に隣接する1又は複数の側壁とを有し、前記第1の接触領域(20)、前記第2の接触領域(22)及び前記活性領域(24)は、前記上面と前記底面との間に配置される前記放射源と、
前記放射源の上面又は底面上に設けられ、かつ、前記放射源の1又は複数の側壁の少なくとも一部を取り囲む蛍光体材料であって、放射によって励起された時に可視光を生成可能な前記蛍光体材料と、
前記放射源の上面に設けられるとともに、前記第1の接触領域(20)に電気的に接続された第1の接触層(36)であって、前記放射源からの放射及び前記可視光を反射する反射器として機能するように構成された面を有し、該面は、前記放射の少なくとも一部及び前記可視光の少なくとも一部を、前記放射源の底面に向けるように構成されている前記第1の接触層(36)と、を備え、
前記可視光の出力が前記放射源の底面から取り出されることを特徴とする、発光装置。 - 請求項1に記載の発光装置において、前記活性領域(24)は、GaN|AlGaN多重量子井戸、GaN|AlGaNダブルへテロ構造およびGaN量子井戸層からなるグループから選択される構造を有する、発光装置。
- 請求項1に記載の発光装置において、前記第1の接触層はアルミニウムを含む、発光装置。
- 請求項1に記載の発光装置において、前記第1の接触層(36)と前記第1の接触領域(20)とを電気的に連結する第1のオーミックコンタクト(38)を更に備える、発光装置。
- 請求項1に記載の発光装置において、前記第2の接触領域(22)に電気的に接続される第2の接触層(40)を更に備える、発光装置。
- 請求項1に記載の発光装置において、前記活性領域(24)に隣接して設けられたミラー(46)を更に備え、該ミラーは、前記蛍光体材料からの可視光を通過させると共に、前記活性領域(24)により放出される放射を反射する、発光装置。
- 請求項6に記載の発光装置において、前記ミラー(46)は、交互するGaN層及びAlGaN層のスタックから形成された分布型ブラッグ反射器であり、各層が、UV・LED放射のピーク波長の4分の1の光学長を有し、また、P−N接合の形成前に成長される層である、発光装置。
- 請求項1に記載の発光装置において、前記放射源を成長させる基板を更に有する、発光装置。
- 請求項8に記載の発光装置において、前記基板はサファイアを含む、発光装置。
- 請求項1に記載の発光装置において、前記蛍光体材料は、前記放射源の前記上面に設けられる、発光装置。
- 請求項1に記載の発光装置において、前記蛍光体材料は蛍光体層を形成する、発光装置。
- 請求項1に記載の発光装置において、前記第1の接触層(36)の前記面は、前記蛍光体材料からの可視光を、所望の可視光出力に向けて反射する、発光装置。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/218,816 | 1998-12-22 | ||
US09/218,816 US6373188B1 (en) | 1998-12-22 | 1998-12-22 | Efficient solid-state light emitting device with excited phosphors for producing a visible light output |
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JP2000590229A Division JP2002533938A (ja) | 1998-12-22 | 1999-11-30 | 励起蛍光体を有する可視光出力発生用の高効率固体発光装置 |
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JP2014090220A true JP2014090220A (ja) | 2014-05-15 |
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JP2000590229A Pending JP2002533938A (ja) | 1998-12-22 | 1999-11-30 | 励起蛍光体を有する可視光出力発生用の高効率固体発光装置 |
JP2014032122A Pending JP2014090220A (ja) | 1998-12-22 | 2014-02-21 | 励起蛍光体を有する可視光出力発生用の高効率固体発光装置 |
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JP2000590229A Pending JP2002533938A (ja) | 1998-12-22 | 1999-11-30 | 励起蛍光体を有する可視光出力発生用の高効率固体発光装置 |
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US (1) | US6373188B1 (ja) |
EP (1) | EP1145332A1 (ja) |
JP (2) | JP2002533938A (ja) |
CA (1) | CA2356530A1 (ja) |
WO (1) | WO2000038250A1 (ja) |
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Also Published As
Publication number | Publication date |
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CA2356530A1 (en) | 2000-06-29 |
JP2002533938A (ja) | 2002-10-08 |
EP1145332A1 (en) | 2001-10-17 |
US6373188B1 (en) | 2002-04-16 |
WO2000038250A1 (en) | 2000-06-29 |
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