JP5511114B2 - 光抽出を向上させた微小発光ダイオードアレイ - Google Patents
光抽出を向上させた微小発光ダイオードアレイ Download PDFInfo
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- JP5511114B2 JP5511114B2 JP2001542391A JP2001542391A JP5511114B2 JP 5511114 B2 JP5511114 B2 JP 5511114B2 JP 2001542391 A JP2001542391 A JP 2001542391A JP 2001542391 A JP2001542391 A JP 2001542391A JP 5511114 B2 JP5511114 B2 JP 5511114B2
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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
- H01L33/08—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 plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body
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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
- H01L33/36—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 electrodes
- H01L33/38—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 electrodes with a particular shape
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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
- H01L33/20—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 particular shape, e.g. curved or truncated substrate
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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
- H01L33/20—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 particular shape, e.g. curved or truncated substrate
- H01L33/22—Roughened surfaces, e.g. at the interface between epitaxial layers
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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
- H01L33/36—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 electrodes
- H01L33/40—Materials therefor
- H01L33/42—Transparent materials
Description
[発明の分野]
本発明は発光ダイオードに関し、さらに詳細には、発光ダイオードの光抽出を向上するための新しい構造に関する。
発光ダイオード(LED)は電気エネルギを光に変換する重要な部類の固体デバイスで、一般に、逆極性にドープされた(oppositely doped)2つの層間に挟まれた半導体材料の活性層を備える。これらのドープされた層間にバイアスが印加されると、正孔および電子が活性層に注入され、そこで正孔および電子が再結合して光を発する。活性領域で発生した光はあらゆる方向に放出され、光はすべての露出面を通ってこのデバイスから流出する。この流出する光を誘導して所望の出力放射プロフィールにするために、LEDのパッケージング(packaging)化が一般に用いられる。
本発明は、光抽出の改良をもたらす微小発光ダイオードを相互に接続したアレイを有する新規な発光ダイオード(LED)を提供する。微小LEDは、より小さな、1から2500平方μmの範囲の活性層を有するが、本発明にとって大きさは重大なことではない。微小LEDのアレイとは、電気的に相互接続した微小LEDをなんらかの形で配置したものである。このアレイは各微小LEDから流出する光に大きな表面積を与え、これによって使用できるLEDからの光を増加させる。この新しいLEDは多くの異なった形状にすることができ、また、標準の加工方法で形成されるので非常に生産性が高い。
図1および2は、本発明によって構成される新しいLED10の1つの実施形態を示す。これは、各微小LED12が絶縁され、逆極性にドープされた2つの層16と18の間に挟まれたそれ自体の半導体材料の活性層14を有する微小LED12のアレイを備えている。好ましい微小LEDにおいては、最上層16がp型であり底層18はn型であるが、この層16、18においてドーピングを逆極性にしても作動する。
Claims (14)
- 光抽出を向上させた発光ダイオード(LED)であって、
導電性の第1のスプレッダ層(20)と、
前記第1のスプレッダ層(20)の表面上に分離して配置され、それぞれが
p型層(16)、
n型層(18)、
前記p型層とn型層(16、18)との間に挟まれた活性層(14)を含み、前記p型層またはn型層の何れか一方が最上層で他の前記層が底層であり、前記第1のスプレッダ層(20)からの電流が前記底層に広がるようにした、複数の微小発光ダイオード(微小LED)(12)と、
前記微小LED(12)の上の相互接続された第2のスプレッダ層(24)とを備え、前記第2のスプレッダ層(24)からの電流が前記最上層に広がり、前記第1および前記第2のスプレッダ層(20、24)の間に印加されたバイアスによって前記微小LED(12)が発光するようにしたことを特徴とする発光ダイオード(LED)。
- 前記第1のスプレッダ層(20)の前記微小LED(12)と反対側の表面に隣接する基板(28)をさらに備えたことを特徴とする請求項1に記載のLED。
- 前記微小LED(12)と前記微小LED(12)間の前記第1のスプレッダ層(20)の表面とを覆い、前記第2のスプレッダ層(24)と前記微小LED(12)との間に配置された前記絶縁層(23)をさらに備えたことを特徴とする請求項1に記載のLED。
- 前記絶縁層(23)が前記微小LED(12)の各々の上に孔を有し、前記第2のスプレッダ層(24)が前記孔を通じて前記微小LED(12)の各々と接触することを特徴とする請求項3に記載のLED。
- 前記第2のスプレッダ層(24)が、複数の相互に接続された導電性経路を有する相互接続電流広がりグリッドであり、前記微小LED(12)の各々が、その上にありかつ前記孔を通じて前記最上層と接触している1つまたは複数の導電性経路を有することを特徴とする請求項4に記載のLED。
- 前記微小LED(12)と一体化され、前記微小LED(12)から射出する光と相互作用して、前記LEDからの光抽出をさらに向上させるようにした光抽出素子(LEE)(82、84、86、88、90、92、94)をさらに備えることを特徴とする請求項1に記載のLED。
- 前記LEE(101、102、103)が前記微小LED(108)の間の前記第1のスプレッダ層(106)の表面に配置されたことを特徴とする請求項6に記載のLED。
- 前記第2のスプレッダ層(42)が前記微小LED(32)の上に堆積された反射性の金属層であり、前記LEDが前記第1のスプレッダ(34)の前記微小LED(32)と反対側の表面に隣接する基板(36)と前記金属層(42)に取り付けられたサブマウント層(46)とをさらに備え、前記LEDの前記基板(36)が主要発光面になることを特徴とする請求項4に記載のLED。
- 前記サブマウント層(46)と前記第1のスプレッダ層(34)との間の導電性フィンガ(49)と、前記導電性フィンガ(49)に接続された前記サブマウント層(46)の上の第1のコンタクト(50)と、前記金属層(48)に接続された前記サブマウント層(46)の上の第2のコンタクト(44)とをさらに備え、バイアスが前記電気的コンタクト(44、50)の間に印加されると前記微小LED(32)が発光することを特徴とする請求項8に記載のLED。
- 第1のスプレッダ層(56)と、
前記第1のスプレッダ層(56)上に配置され、前記第1のスプレッダ層(56)に注入された電流が広がっていく微小LED(52)のアレイと、
前記微小LED(52)の上に配置され、前記微小LED(52)の間に導電性経路(53)を有し、注入された電流が前記微小LED(52)に広がっていく相互接続された電流広がりグリッド(54)と、
前記導電性経路(53)の下の微小LED(52)の間にあって、前記第1のスプレッダ層(56)を前記導電性経路(53)と電気的に絶縁している半導体材料と、
コンタクト(60、62)にわたって印加されたバイアスが前記微小LED(52)のアレイの発光を引き起こす、前記第1および第2のスプレッダ層(56、54)のそれぞれの上にある第1および第2のコンタクト(60、62)とを備えることを特徴とする発光ダイオード(LED)。
- 前記複数の微小発光ダイオード(微小LED)(12)は、前記第1のスプレッダ層(20)の表面上に直接配置される請求項1に記載のLED。
- 前記第2のスプレッダ層(24)は、共に相互接続される複数の導電性経路を備えている請求項1に記載のLED。
- 前記微小LED(52)のアレイは、前記第1のスプレッダ層(56)の表面上に直接配置される請求項10に記載のLED。
- 複数の前記導電性経路(53)が共に相互接続される請求項10に記載のLED。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16881799P | 1999-12-03 | 1999-12-03 | |
US60/168,817 | 1999-12-03 | ||
US09/713,576 | 2000-11-14 | ||
US09/713,576 US6410942B1 (en) | 1999-12-03 | 2000-11-14 | Enhanced light extraction through the use of micro-LED arrays |
PCT/US2000/032084 WO2001041219A1 (en) | 1999-12-03 | 2000-11-20 | Micro-led arrays with enhanced light extraction |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2004505434A JP2004505434A (ja) | 2004-02-19 |
JP2004505434A5 JP2004505434A5 (ja) | 2007-08-16 |
JP5511114B2 true JP5511114B2 (ja) | 2014-06-04 |
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2001542391A Expired - Lifetime JP5511114B2 (ja) | 1999-12-03 | 2000-11-20 | 光抽出を向上させた微小発光ダイオードアレイ |
Country Status (9)
Country | Link |
---|---|
US (1) | US6410942B1 (ja) |
EP (3) | EP1234334B1 (ja) |
JP (1) | JP5511114B2 (ja) |
KR (1) | KR100731673B1 (ja) |
CN (1) | CN1229871C (ja) |
AU (1) | AU1790501A (ja) |
CA (1) | CA2393007C (ja) |
HK (1) | HK1048707A1 (ja) |
WO (1) | WO2001041219A1 (ja) |
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-
2000
- 2000-11-14 US US09/713,576 patent/US6410942B1/en not_active Expired - Lifetime
- 2000-11-20 WO PCT/US2000/032084 patent/WO2001041219A1/en active Application Filing
- 2000-11-20 EP EP00980675.3A patent/EP1234334B1/en not_active Expired - Lifetime
- 2000-11-20 JP JP2001542391A patent/JP5511114B2/ja not_active Expired - Lifetime
- 2000-11-20 CA CA2393007A patent/CA2393007C/en not_active Expired - Lifetime
- 2000-11-20 AU AU17905/01A patent/AU1790501A/en not_active Abandoned
- 2000-11-20 EP EP10189721.3A patent/EP2325904B1/en not_active Expired - Lifetime
- 2000-11-20 EP EP10189711.4A patent/EP2325903B1/en not_active Expired - Lifetime
- 2000-11-20 CN CNB008166013A patent/CN1229871C/zh not_active Expired - Lifetime
- 2000-11-20 KR KR1020027007122A patent/KR100731673B1/ko not_active IP Right Cessation
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2003
- 2003-01-28 HK HK03100708.0A patent/HK1048707A1/zh unknown
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CN1229871C (zh) | 2005-11-30 |
CA2393007A1 (en) | 2001-06-07 |
WO2001041219A1 (en) | 2001-06-07 |
EP1234334B1 (en) | 2019-11-13 |
CN1402880A (zh) | 2003-03-12 |
JP2004505434A (ja) | 2004-02-19 |
EP2325903B1 (en) | 2020-01-08 |
EP2325904A3 (en) | 2011-06-01 |
KR100731673B1 (ko) | 2007-06-25 |
KR20020069357A (ko) | 2002-08-30 |
US6410942B1 (en) | 2002-06-25 |
EP2325903A1 (en) | 2011-05-25 |
EP2325904B1 (en) | 2018-08-01 |
EP2325904A2 (en) | 2011-05-25 |
AU1790501A (en) | 2001-06-12 |
HK1048707A1 (zh) | 2003-04-11 |
CA2393007C (en) | 2012-05-29 |
EP1234334A1 (en) | 2002-08-28 |
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