JP5746505B2 - 光結晶及び発光セラミックを含む光放射デバイス - Google Patents
光結晶及び発光セラミックを含む光放射デバイス Download PDFInfo
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Description
Cext=Lout+m*(Lin*Seff)
従って、この構造の取り出し効率は、50%+1*(50%*40%)=70%である。これを再びSeff=40%を持つ光結晶での4導波モードをサポートするエピタキシャル構造と比較する。光が等しくすべてのモードに入る場合、1つの出口モードを含む各モードは20%の光を持つ。この構造は、20%+4*(20%*40%)=52%の取り出し効率を持つだけである。この議論において、光結晶は、100%効率的に光を散乱して出すわけではない。幾つかの実施例において、光結晶は十分に深くエッチングされ、適当な格子の寸法を持つので、光子的バンド・ギャップが、導波モード(Seff=100%)を阻害するLEDの面に作成される。エピタキシャル層が薄くなるほど、光子的バンドギャップを作ることが容易になる。キャビティの厚さ(すなわちエピタキシャル層70の厚み)は、エピタキシャル層が導波モードの数を低減するためにできるだけ薄いが、効率的に電流を拡散するには十分厚いように選択される。多くの実施例において、エピタキシャル層70の厚みは、約1μm未満、好ましくは約0.5μm未満である。
A2=A1sin2θ1/n2
により決定される。誘電体集光器としても知られるレンズ414は、半導体構造により放射される放射パターンに対して最適化されてもよい。例えば、狭い放射円錐へ光を放射するように光結晶を合わせることは、領域A1を低減させてもよくなり、これは領域A2内の輝度を増大させる。
Claims (8)
- n型領域とp型領域との間に配される光放射層と、半導体構造の面内又は面上に形成される屈折率の変動部とを有する前記半導体構造と、前記光放射層により放射される光の通路に配される、剛性の凝集蛍光体粒子を有する発光セラミック層と、
前記光放射層により放射される光の通路に配される誘電体集光器とを有し、前記半導体構造からの光は、前記誘電体集光器の側面により反射されて、前記誘電体集光器の下部の大きな領域から前記誘電体集光器の上部の狭い領域を通って放射され、前記大きな領域から前記狭い放射領域へ光を放射するように前記屈折率の変動部を合わせることにより当該狭い放射領域からの光の輝度を増大させ、前記発光セラミック層は前記誘電体集光器により前記半導体構造から離隔されている、デバイス。 - 前記デバイスの半導体層の全体の厚さが約1μmより小さい、請求項1に記載のデバイス。
- 前記半導体構造と前記セラミック層との間に配される光バルブを更に有する、請求項1に記載のデバイス。
- 前記光バルブが誘電体積層、配布されたブラッグリフレクタ、ダイクロイックフィルタ、2次元光結晶及び3次元光結晶のうちの一つを有する、請求項3に記載のデバイス。
- 屈折率の前記変動部が、あらかじめ決められた角度放射プロフィール内の光を放射し、前記光バルブが、前記あらかじめ決められた角度放射プロフィール内で放射されて前記光バルブに入射する主要な部分の光を透過する、請求項3に記載のデバイス。
- 前記半導体構造から出る光の60%より多い光が前記半導体構造の主表面に対する法線から円錐45°内で放射され、前記円錐45°内で放射される光の90%より多い光が前記光バルブにより透過される、請求項5に記載のデバイス。
- 前記セラミック層により放射される光の10%より少ない光が前記光バルブにより透過される、請求項6に記載のデバイス。
- 前記誘電体集光器がガラスレンズである、請求項1に記載のデバイス。
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US11/829,799 US20070267646A1 (en) | 2004-06-03 | 2007-07-27 | Light Emitting Device Including a Photonic Crystal and a Luminescent Ceramic |
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CN (1) | CN101821862B (ja) |
BR (1) | BRPI0814324A2 (ja) |
RU (1) | RU2479072C2 (ja) |
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- 2008-07-03 EP EP08776564.0A patent/EP2176892B1/en active Active
- 2008-07-03 BR BRPI0814324-2A2A patent/BRPI0814324A2/pt not_active Application Discontinuation
- 2008-07-03 RU RU2010107241/28A patent/RU2479072C2/ru active
- 2008-07-03 KR KR1020107004607A patent/KR20100052504A/ko not_active Application Discontinuation
- 2008-07-03 WO PCT/IB2008/052687 patent/WO2009016529A1/en active Application Filing
- 2008-07-24 TW TW097128199A patent/TWI481066B/zh active
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2011
- 2011-12-02 US US13/309,887 patent/US20120074448A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US20120074448A1 (en) | 2012-03-29 |
EP2176892A1 (en) | 2010-04-21 |
CN101821862B (zh) | 2013-07-03 |
EP2176892B1 (en) | 2017-09-27 |
TWI481066B (zh) | 2015-04-11 |
CN101821862A (zh) | 2010-09-01 |
BRPI0814324A2 (pt) | 2015-01-20 |
RU2010107241A (ru) | 2011-09-10 |
US20070267646A1 (en) | 2007-11-22 |
TW200913328A (en) | 2009-03-16 |
JP2010534931A (ja) | 2010-11-11 |
WO2009016529A1 (en) | 2009-02-05 |
RU2479072C2 (ru) | 2013-04-10 |
KR20100052504A (ko) | 2010-05-19 |
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