JP5490997B2 - 交流駆動型の発光ダイオード - Google Patents
交流駆動型の発光ダイオード Download PDFInfo
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- JP5490997B2 JP5490997B2 JP2008070697A JP2008070697A JP5490997B2 JP 5490997 B2 JP5490997 B2 JP 5490997B2 JP 2008070697 A JP2008070697 A JP 2008070697A JP 2008070697 A JP2008070697 A JP 2008070697A JP 5490997 B2 JP5490997 B2 JP 5490997B2
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- 239000004065 semiconductor Substances 0.000 claims description 86
- 239000000758 substrate Substances 0.000 claims description 47
- 238000003491 array Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 150000001875 compounds Chemical class 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 229910002601 GaN Inorganic materials 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 5
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 229910052763 palladium Inorganic materials 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 3
- 229910052594 sapphire Inorganic materials 0.000 description 3
- 239000010980 sapphire Substances 0.000 description 3
- -1 gallium nitride compound Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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 having potential barriers, specially adapted for light emission
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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 having potential barriers, 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 having potential barriers, 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 having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
-
- 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
- H01L33/36—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 electrodes
- H01L33/38—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 electrodes with a particular shape
- H01L33/387—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 electrodes with a particular shape with a plurality of electrode regions in direct contact with the semiconductor body and being electrically interconnected by another electrode layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
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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
- H01L33/36—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 electrodes
- H01L33/38—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 electrodes with a particular shape
- H01L33/385—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 electrodes with a particular shape the electrode extending at least partially onto a side surface of the semiconductor body
-
- 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
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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- Microelectronics & Electronic Packaging (AREA)
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- Condensed Matter Physics & Semiconductors (AREA)
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- Manufacturing & Machinery (AREA)
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- Led Device Packages (AREA)
Description
前記特許文献2によると、LED(発光セル)がサファイア基板のような単一の絶縁性基板上に二次元的に直列連結され、LEDアレイを形成する。このような二つのLEDアレイが、前記サファイア基板上にて逆並列で連結される。
また、発光ダイオードの上部電極パッド及び下部電極を互いに対向するコーナー部に配置することにより、電流分散を最大化することができる。
以下の図面において、発光ダイオード1aは、本願発明の基本的な趣旨を逸脱しない範囲内で、適応的に発光セル1として示す。
前記InxGa1−xN(0<x<1)井戸層は、前記InxGa1−xN(0≦x<1)バリア層に比べてInの含量がさらに大きく形成され得る。
さらに、上部電極パッド64及び下部電極65は、基板51の互いに対向するコーナー部にそれぞれ位置するように配置されている。これにより、上部電極パッド64を通じて供給される電流が上部電極層61内に均一に分散され得る。
図3を参照すると、単一チップ50は、基板51を含む。基板51は、絶縁基板であり、または、上面に絶縁層を有する導電性基板であってもよい。基板51上に複数個の発光セル1が配置される。発光セル1は、配線により互いに直列連結され、直列アレイ52を形成する。直列アレイ52の両端部にボンディングパッド71が配置されてもよい。ボンディングパッド71は、直列アレイ52の両端部にそれぞれ電気的に連結される。
例えば、絶縁層85は、上部電極パッド64及び下部電極65を露出させる開口部を有し、配線87は、開口部を通じて、隣接した発光セルの上部電極パッド64及び下部電極65を互いに連結して発光セルを直列連結する。配線87により、単一基板51上で発光セルが直列連結された直列アレイ(図3の52)が形成される。
図5を参照すると、基板51上に発光セル1が直列連結された二つの直列アレイ52a、52cが配置される。直列アレイ52a、52cは、ボンディングパッド71a、71b間で互いに逆並列で連結される。
図6を参照すると、基板上に数個の発光セルがアレイで配置されている。各発光セルは、ステップカバー工程を通じて、連結手段により電気的に互いに連結されている。
例えば、第1の発光セル1、第2の発光セル2、第3の発光セル3が並んで配置されている。この際、第1の発光セル1には、左下部コーナーに下部電極が配置されており、右上部コーナーに上部電極パッドが配置されている。一方、第2の発光セル2には、左上部コーナーに下部電極が配置されており、右下部に上部電極パッドが配置されている。又、第3の発光セル3には、左下部コーナーに下部電極が配置されており、右上部に上部電極パッドが配置されている。
このように、各発光セル毎に互いに対向するコーナー部に上部電極パッド及び下部電極が配置されていることにより、交流発光ダイオードの製造工程を簡素化させ、信頼性を向上させることができる。
図7を参照すると、比較例による発光ダイオードに配置された各発光セルには、上部電極パッド及び下部電極が互いに対向する面の周縁に長く形成されている。図6に比べて、上部電極パッド及び下部電極が発光セルに占める比率が遥かに多いことがわかる。したがって、上部電極パッド、下部電極、及び配線が占める領域が広いことにより、相対的に発光領域が減少したことがわかる。
すなわち、図6に示す本発明の一実施例による発光ダイオードに設けられる各発光セルから出力される光パワーを示すものであり、光パワー別発光セルの個数を示している。
図8を参照すると、本発明の一実施例による発光ダイオードに設けられた各発光セルの光パワーは、平均135mWと測定された。一方、図9を参照すると、比較例による発光ダイオードに設けられた各発光セルの光パワーは、平均119mWと測定された。
このような比較結果から、本発明の一実施例による発光ダイオードが、比較例による発光ダイオードに比べて発光効率に優れていることがわかる。
例えば、図3乃至図5では、直列連結された発光セルを含む直列アレイの様々な構造について説明した。しかし、各図面には示されていないが、各直列アレイ内に含まれている各発光セル1は、図6乃至図9と関連して詳細に説明された電極構造を有している。すなわち、各発光セル1内に形成されている上部電極パッド及び前記下部電極は、対角線位置のコーナーにそれぞれ配置され、各発光セル1は、隣接した発光セルに対して、上部電極パッド及び下部電極の配置が互いに対称構造を有して配列されている。このような電極の構造による効果は、図6乃至図9と関連して充分説明された。
1a 発光ダイオード
50 単一チップ
51 基板
52、52a、52c 直列アレイ
53 バッファ層
55 第1の導電型下部半導体層
57 活性層
59 第2の導電型上部半導体層
61 上部電極層
64 上部電極パッド
65 下部電極
71、71a、71b ボンディングパッド
85 絶縁層
87 配線
100 単一チップ
105 連結手段
Claims (5)
- 成長基板と、
前記成長基板上に形成され、第1の導電型下部半導体層と、前記第1の導電型下部半導体層上に配置された第2の導電型上部半導体層と、前記第2の導電型上部半導体層の少なくとも一部が除去されることにより露出される前記第1の導電型下部半導体層上に形成される下部電極と、前記第2の導電型上部半導体層上に配置される上部電極と、をそれぞれ備え、第1の発光セルアレイを形成し第1の方向に隣接して配置される第1の発光セル及び第2の発光セル、並びに第2の発光セルアレイを形成し前記第1の方向と垂直の方向である第2の方向に前記第2の発光セルと隣接して配置される第3の発光セルと、
前記成長基板上に形成される、前記上部電極及び前記上部電極の一部を露出させる絶縁層と、前記絶縁層を覆い前記第1の発光セル及び前記第2の発光セルを電気的に連結し、前記第1の発光セルと前記第2の発光セルを直列に接続する配線と
を備え、
前記各発光セルそれぞれにおいて、前記上部電極と前記下部電極は、対角方向に対向するコーナー部に配置され、
前記各発光セルそれぞれにおいて、前記上部電極と前記下部電極を結ぶ線分は、その発光セルと前記第1の方向又は前記第2の方向に隣接する発光セルの前記上部電極と前記下部電極を結ぶ線分と対称であり、
前記第2の発光セルの前記下部電極は、前記第2の発光セルの前記下部電極に隣接する前記第1の発光セルの上部電極に前記配線により接続され、
前記第2の発光セルの下部電極は、前記第2の発光セルの前記下部電極に隣接する前記第3の発光セルの上部電極に電気的に接続され、
前記第1の発光セルの前記上部電極と前記下部電極を結ぶ線分は、対向する前記第3の発光セルの前記上部電極と前記下部電極を結ぶ線分の延長線上にあることを特徴とする発光素子。 - 前記第2の導電型上部半導体層と前記上部電極との間に配置されている透明電極層を有することを特徴とする請求項1記載の発光素子。
- 成長基板と、
前記成長基板上に形成され、互いに隣接する直列連結された第1及び第2の発光セルそれぞれを備え、互いに逆並列に接続されて交流電源からの順方向電圧及び逆方向電圧により動作する第1及び第2の発光セルアレイと、
前記第1及び第2の発光セルそれぞれを互いに直列に接続し、前記成長基板上に形成される配線と、を備え、
前記第1及び第2の発光セルそれぞれは、第1の導電型下部半導体層と、前記第1の導電型下部半導体層上に配置された第2の導電型上部半導体層と、前記第2の導電型上部半導体層の少なくとも一部が除去されることにより露出される前記第1の導電型下部半導体層上に形成される下部電極と、前記第2の導電型上部半導体層上に前記下部電極と対角方向に対向するコーナー部に配置された上部電極と、を備え、
前記配線は、前記成長基板上に形成される、前記上部電極及び前記上部電極の一部を露出させる絶縁層を覆い前記第1の発光セルの前記上部電極及び第2の発光セルの前記下部電極を電気的に連結し前記第1の発光セルと前記第2の発光セルを直列に接続し、
前記第1の発光セルアレイにおいて、前記第1の発光セルの前記上部電極及び第2の発光セルの前記下部電極は、第1の線分上に配置され、
前記第1の発光セルアレイにおいて、前記第1の発光セルの前記上部電極は、前記第2の発光セルの前記下部電極と隣接し、
前記第2の発光セルアレイにおいて、前記第1の発光セルの前記上部電極及び第2の発光セルの前記下部電極は、前記第1の線分と平行な第2の線分上に配置され、
前記第2の発光セルアレイの前記第1の発光セルの前記上部電極及び前記第1の発光セルアレイの前記第2の発光セルの前記下部電極は隣接し、前記第2の発光セルアレイの前記第1の発光セルの前記上部電極と前記第1の発光セルアレイの前記第2の発光セルの前記下部電極を電気的に接続し、前記第1の線分と垂直な第3の線分上に配置される連結手段を更に備えることを特徴とする発光素子。 - 前記成長基板上に形成され、直列に連結された複数の第3の発光セルを備え、第2の発光セルアレイと逆並列に連結された第3の発光セルアレイを更に備え、前記順方向電圧の印加の際に、前記第1の発光セルと前記第3の発光セルが発光することを特徴とする請求項3記載の発光素子。
- 前記連結手段は、前記順方向電圧による動作時に、前記第2の発光セルアレイに逆電圧による過電圧が印加されることを防止することを特徴とする請求項3に記載の発光素子。
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KR10-2007-0026697 | 2007-03-19 | ||
KR1020070026697A KR100974923B1 (ko) | 2007-03-19 | 2007-03-19 | 발광 다이오드 |
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JP2008235894A5 JP2008235894A5 (ja) | 2010-02-18 |
JP5490997B2 true JP5490997B2 (ja) | 2014-05-14 |
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US (3) | US8896011B2 (ja) |
EP (1) | EP1973161A3 (ja) |
JP (2) | JP5490997B2 (ja) |
KR (1) | KR100974923B1 (ja) |
CN (2) | CN101958334B (ja) |
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KR20080085343A (ko) | 2008-09-24 |
KR100974923B1 (ko) | 2010-08-10 |
US20110215346A1 (en) | 2011-09-08 |
JP5799124B2 (ja) | 2015-10-21 |
EP1973161A3 (en) | 2011-03-02 |
JP2014112721A (ja) | 2014-06-19 |
US8283682B2 (en) | 2012-10-09 |
US20150076532A1 (en) | 2015-03-19 |
CN101958334A (zh) | 2011-01-26 |
CN101271915A (zh) | 2008-09-24 |
US8896011B2 (en) | 2014-11-25 |
EP1973161A2 (en) | 2008-09-24 |
CN101271915B (zh) | 2011-05-04 |
US20080230765A1 (en) | 2008-09-25 |
CN101958334B (zh) | 2014-06-04 |
US9461091B2 (en) | 2016-10-04 |
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