JP2015188035A - 発光装置の製造方法、発光装置およびプロジェクター - Google Patents
発光装置の製造方法、発光装置およびプロジェクター Download PDFInfo
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- JP2015188035A JP2015188035A JP2014065274A JP2014065274A JP2015188035A JP 2015188035 A JP2015188035 A JP 2015188035A JP 2014065274 A JP2014065274 A JP 2014065274A JP 2014065274 A JP2014065274 A JP 2014065274A JP 2015188035 A JP2015188035 A JP 2015188035A
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- bonding layer
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- H10H20/857—Interconnections, e.g. lead-frames, bond wires or solder balls
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- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
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Abstract
Description
本発明の発光装置の製造方法は、基板に第1導電性ペーストを配置し、前記第1導電性ペーストを焼結して第1接合層を形成する第1接合層形成工程と、
半導体発光素子に第2導電性ペーストを配置し、前記第2導電性ペーストを焼結して第2接合層を形成する第2接合層形成工程と、
前記第1接合層および前記第2の接合層の表面を研磨する研磨工程と、
前記第1接合層と前記第2接合層との間に第3導電性ペーストを介在させ、前記第3導電性ペーストを焼結して前記第1接合層と前記第2接合層とを接合する第3接合層を形成する第3接合層形成工程と、を有することを特徴とする。
これにより、第1、第2接合層の表面を簡単に研磨することができる。
これにより、信頼性の高い発光装置が得られる。
前記発光装置から出射された光を、画像情報に応じて変調する光変調装置と、
前記光変調装置によって形成された画像を投射する投射装置と、を含むことを特徴とする。
これにより、信頼性の高いプロジェクターが得られる。
<第1実施形態>
まず、第1実施形態に係る発光装置およびその製造方法について説明する。
図1に示す発光装置100は、半導体発光素子10と、基板20と、これらを接合する接合層30と、を有している。以下、半導体発光素子10、基板20および接合層30について順次説明する。
半導体発光素子10は、SLD(スーパールミネッセントダイオード)である。SLDは、例えば、半導体レーザーに比べてスペックルノイズを低減することができ、かつLEDに比べて高出力化を図ることができるため、例えば、発光装置100をプロジェクター等の光源に用いる場合に好適である。ただし、半導体発光素子10としては、SLDに限定されず、例えば、半導体レーザー、LEDであってもよい。
基板20は、主に、半導体発光素子10を支持する機能と、半導体発光素子10の熱を放熱する機能と、を有している。このような基板20は、例えば、シリコン基板やアルミナ等で構成されている。また、基板20の上面(半導体発光素子10側の面)には配線パターン40が形成されている。
接合層30は、基板20の上面に配置されている第1接合層31と、半導体発光素子10の下面に設けられている第2接合層32と、第1接合層31と第2接合層32の間に設けられている(介在している)第3接合層33と、を有し、これらの積層体で構成されている。これら第1、第2、第3接合層31、32、33は200W/K・m以上であることが好ましい。これにより、接合層30に十分に高い熱伝導性を付与することができ、半導体発光素子10の熱をより効率的に基板20へ伝達することができる。
次に、発光装置100の製造方法について、図面を参照しながら説明する。
まず、図4(a)に示すように、上面に配線パターン40が形成されている基板20を用意する。基板20としては、シリコン基板やアルミナ等を用いることができる。次に、図4(b)に示すように、基板20の上面に第1導電性ペースト310を供給・配置する。第1導電性ペースト310の供給・配置は、例えば、スクリーン印刷法で行うことができる。ただし、第1導電性ペースト310の基板20への供給・配置は、スクリーン印刷法に限定されず、例えば、ディスペンサーを用いたディスペンス法で行ってもよい。
次に、図5(a)に示すように、半導体発光素子10を用意する。次に、図5(b)に示すように、半導体発光素子10の第2電極114の表面に第2導電性ペースト320を供給・配置する。第2導電性ペースト320の供給・配置は、例えば、スクリーン印刷法で行うことができる。ただし、第2導電性ペースト320の半導体発光素子10への供給・配置は、スクリーン印刷法に限定されず、例えば、ディスペンサーを用いたディスペンス法で行ってもよい。また、第2導電性ペースト320としては、特に限定されず、例えば、第1導電性ペースト310と同じものを用いることができる。
次に、図6(a)に示すように、第1、第2接合層31、32の表面を研磨することで、第1、第2接合層32の表面を平坦化する。これにより、後の第3接合層形成工程において、第1接合層31と第3接合層33および第2接合層32と第3接合層33との間でのボイドの発生を抑制することができる。また、第1、第2接合層31、32の表面を研磨することで、表面に形成されている酸化膜等の不要膜を除去することができるので、第1、第2接合層31、32と第3接合層33とをより強固に接合することができる。なお、研磨方法としては、特に限定されず、例えば、ラッピング研磨、CMP(化学機械研磨)、プラズマ処理等で行うことができるが、これらの中でも、ラッピング研磨を用いることが好ましい。ラッピング研磨は、CMPのようにスラリーを用いず、プラズマ処理のような特殊な装置も必要でないため、他の方法に比べて作業性に優れている。
次に、図6(b)に示すように、第1接合層31と第2接合層32との間に第3導電性ペースト330を介在させて、基板20と半導体発光素子10とを重ね合わせる。第3導電性ペースト330としては、特に限定されず、例えば、溶媒331に金属粒子332を分散させたものを用いることができる。金属粒子332としては、特に限定されず、銀粒子、銅粒子等を用いることができる。また、金属粒子332の粒径(直径)としては、特に限定されないが、例えば、1nm以上、100nm以下程度のものを含むことが好ましい。すなわち、金属粒子332は、いわゆる「金属ナノ粒子」を含むことが好ましい。このように、金属粒子332が微小な粒径のものを含むことで、融点を低くすることができ、金属粒子332が低温で融着する。すなわち、第3導電性ペースト330の焼成温度を低くすることができ、半導体発光素子10や基板20への熱ダメージを低減することができる。一方、溶媒331としては、例えば、n−ヘキサン、n−ヘプタン、n−ウンデカン、トルエン等の炭化水素系溶媒、n−ノナノール、n−ウンデカノール等の高級アルコール、オクタノール、テルピネオール等のアルコール類、水系溶媒を用いることができる。なお、第3導電性ペースト330としては、金属粒子とバインダー(樹脂の接着剤等)によって構成されるものを用いても良い。
以上によって、発光装置100が得られる。
図9は、本発明の第2実施形態に係る発光装置の断面図である。図10は、図9に示す発光装置の製造過程を示す断面図である。
次に、本発明のプロジェクターについて説明する。ただし、以下に示す構成は、一例であって、本発明のプロジェクターの構成は、以下の構成に限定されない。
以上、プロジェクター500について説明した。
Claims (8)
- 基板に第1導電性ペーストを配置し、前記第1導電性ペーストを焼結して第1接合層を形成する第1接合層形成工程と、
半導体発光素子に第2導電性ペーストを配置し、前記第2導電性ペーストを焼結して第2接合層を形成する第2接合層形成工程と、
前記第1接合層および前記第2の接合層の表面を研磨する研磨工程と、
前記第1接合層と前記第2接合層との間に第3導電性ペーストを介在させ、前記第3導電性ペーストを焼結して前記第1接合層と前記第2接合層とを接合する第3接合層を形成する第3接合層形成工程と、を有することを特徴とする発光装置の製造方法。 - 前記第1導電性ペースト、前記第2導電性ペースト、および前記第3導電性ペーストは、粒径が1nm以上、100nm以下の金属粒子を含んでいる請求項1に記載の発光装置の製造方法。
- 前記第2接合層は、前記第1接合層よりも厚い請求項1または2に記載の発光装置の製造方法。
- 前記第1接合層および前記第2接合層の表面粗さRaは、10μm以下である請求項1ないし3のいずれか1項に記載の発光装置の製造方法。
- 前記研磨工程では、ラッピング研磨によって前記第1接合層および前記第2の接合層の表面を研磨する請求項1ないし4のいずれか1項に記載の発光装置の製造方法。
- 前記第3接合層は、その全域が前記第1接合層と前記第2接合層との間の領域内に位置している請求項1ないし5のいずれか1項に記載の発光装置の製造方法。
- 請求項1ないし6のいずれか1項に記載の発光装置の製造方法によって製造されることを特徴とする発光装置。
- 請求項7に記載の発光装置と、
前記発光装置から出射された光を、画像情報に応じて変調する光変調装置と、
前記光変調装置によって形成された画像を投射する投射装置と、を含むことを特徴とするプロジェクター。
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US14/668,039 US9450161B2 (en) | 2014-03-27 | 2015-03-25 | Method of manufacturing a light-emitting device by sintering conductive pastes |
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JP2012178507A (ja) * | 2011-02-28 | 2012-09-13 | Mitsubishi Materials Corp | 接合用積層体および接合体 |
JP2013197445A (ja) * | 2012-03-22 | 2013-09-30 | Seiko Epson Corp | 半導体光源、投影表示装置及び半導体光源の製造方法 |
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US9450161B2 (en) | 2016-09-20 |
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CN104953019A (zh) | 2015-09-30 |
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