JP4905009B2 - 発光装置の製造方法 - Google Patents
発光装置の製造方法 Download PDFInfo
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- JP4905009B2 JP4905009B2 JP2006247285A JP2006247285A JP4905009B2 JP 4905009 B2 JP4905009 B2 JP 4905009B2 JP 2006247285 A JP2006247285 A JP 2006247285A JP 2006247285 A JP2006247285 A JP 2006247285A JP 4905009 B2 JP4905009 B2 JP 4905009B2
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Description
また、特許文献2に記載のもので、発光素子が透明樹脂やガラスなどによって封止されていない場合、屈折率の高い材料からなる発光素子内で発した光が外部放射されず発光効率が低下する。さらに、特許文献2に記載のものでは、円盤状の変換部材をLED素子が搭載されたケース開口に設けるにしろ、円筒キャップ状の変換部材によりLED素子を包囲するにしろ、LED素子と変換部材とが離隔されて配置されるため、LED素子から出射される光の光路差にって色むらが生じることは回避できない。
搭載部準備工程によって準備された、搭載部上に発光素子が搭載された発光装置を製造するにあたり、
粉末状のガラスと粉末状の蛍光体とを混合し、該蛍光体が該ガラス内に分散された混合粉末を生成する混合工程と、
前記混合粉末を溶融した後に、該混合粉末を固化して蛍光体分散ガラスを生成するガラス生成工程と、
前記蛍光体分散ガラスをホットプレス加工により前記発光素子が搭載された前記搭載部に融着し、前記発光素子を前記搭載部上で前記蛍光体分散ガラスにより封止するガラス封止部を形成するガラス封止工程と、を含み、
前記ガラス生成工程において生成された前記蛍光体分散ガラスを前記ガラス封止部の厚さに対応するようにスライスして板状に加工する板状加工工程をさらに含み、
前記ガラス封止工程において前記板状に加工された前記蛍光体分散ガラスを略平坦な前記搭載部に融着することを特徴とする発光装置の製造方法が提供される。
前記ガラス生成工程にて生成された前記蛍光体分散ガラスを板状に加工する板状加工工程をさらに含み、
前記ガラス封止工程にて、板状に加工された前記蛍光体分散ガラスを略平坦な前記搭載部に融着することが好ましい。
まず、ZnO−B2O3−SiO2−Nb2O5−Na2O−Li2O系の熱融着ガラスを粉砕して、平均粒径が30μmのガラスの粉末体を生成する。これに、平均粒径が10μmのYAGからなる蛍光体7を混合し、蛍光体7がガラスの粉末内に均一に分散された混合粉末10を生成する(混合工程)。
素子搭載基板3は、アルミナ(Al2O3)の多結晶のため透光性があり、Al2O3へ進入すると図10の下方向へ抜ける光や、裏面パターン42のW層4aで吸収される光となるのに対し、LED素子202がマウントされる箇所に全体的に形成された表面パターン41のAu層4cによりAl2O3への光の侵入を防ぐことができる。さらに、LED素子202の底面から素子搭載基板3側へ放射され、蛍光体層209で反射した光の大半は再度LED素子202を通過した後に外部放射されるが、LED素子202内の吸収率は青色光より黄色光の方が低いため、主にLED素子202と素子搭載基板3との間にある蛍光体で青色光を黄色光に変換することにより、光損失を減らすことができる。さらにまた、ガラス封止部6の蛍光体7の濃度を減じて所定の色とできるため、蛍光体7による光閉込損失を低減することができる。これらにより、発光装置201の光取り出し効率を向上させることができる。
また、p側コンタクト電極に透明電極を用いたとしても、透過した光を表面パターン41で的確に反射させることができ、p側コンタクト電極の選択の自由度が増す。
ここで、ガラス封止部506と蛍光体層509の蛍光体の成分を必ずしも同一とする必要はなく、例えば、ガラス封止部506には青色光と緑色光を発する蛍光体507を用い、蛍光体層509には赤色光を発する蛍光体を用いた構成としてもよい。要は、蛍光体層509に、LED素子502が発する光よりLED素子502での吸収損失が小さい光を発する蛍光体を配置することで、発光効率の向上を図ることができる。LED素子502の電極や素子搭載基板403の表面パターン541に金が用いられている場合には、金の反射率が80%を超える550nm以上の光を発する蛍光体を配置することが望ましい。
2 LED素子
3 素子搭載基板
3a ビアホール
4 回路パターン
4a W層
4b Ni層
4c Au層
4d Ag層
41 表面パターン
42 裏面パターン
43 ビアパターン
44 外部接続端子
5 中空部
6 ガラス封止部
6a 側面
6b 上面
7 蛍光体
20 成長基板
21 バッファ層
22 n型層
23 MQW層
24 p型層
25 p側Rh電極
26 p側パッド電極
27 n側電極
27a Al層
27b Ni層
27c Au層
28 Auバンプ
10 混合粉末
11 蛍光体分散ガラス
12 中間体
80 下台
80a 上面
81 側面枠
82 凹部
83 荷重治具
83a 下部
91 下金型
92 上金型
101 発光装置
106 ガラス封止部
106a 側面
106b 上面
112 中間体
161 第1ガラス材
162 第2ガラス材
201 発光装置
202 LED素子
209 蛍光体層
225 p側ITO電極
227 n側電極
229 蛍光体層
301 発光装置
306 ガラス封止部
306a 側面
306b 上面
361 第1ガラス材
361a 半球部
361b 被覆部
362 第2ガラス材
401 発光装置
404 回路パターン
405 中空部
406 ガラス封止部
441 表面パターン
442 裏面パターン
443 ビアパターン
444 外部接続端子
445 放熱パターン
501 発光装置
502 LED素子
504 回路パターン
507 蛍光体
509 蛍光体層
525 p側コンタクト電極
526 p側パッド電極
527 n側電極
541 表面パターン
542 裏面パターン
601 発光装置
603 素子搭載基板
603b 壁部
606 ガラス封止部
609 蛍光体層
630 蛍光体層
646 反射パターン
646a W層
646b Ni層
646c Au層
Claims (12)
- 搭載部準備工程によって準備された、搭載部上に発光素子が搭載された発光装置を製造するにあたり、
粉末状のガラスと粉末状の蛍光体とを混合し、該蛍光体が該ガラス内に分散された混合粉末を生成する混合工程と、
前記混合粉末を溶融した後に、該混合粉末を固化して蛍光体分散ガラスを生成するガラス生成工程と、
前記蛍光体分散ガラスをホットプレス加工により前記発光素子が搭載された前記搭載部に融着し、前記発光素子を前記搭載部上で前記蛍光体分散ガラスにより封止するガラス封止部を形成するガラス封止工程と、を含み、
前記ガラス生成工程において生成された前記蛍光体分散ガラスを前記ガラス封止部の厚さに対応するようにスライスして板状に加工する板状加工工程をさらに含み、
前記ガラス封止工程において前記板状に加工された前記蛍光体分散ガラスを略平坦な前記搭載部に融着することを特徴とする発光装置の製造方法。 - 前記混合工程は、バインダーを使用しないで行うことを特徴とする請求項1に記載の発光装置の製造方法。
- 前記搭載部準備工程は、前記発光素子へ電力を供給するための回路パターン及び前記発光素子から発せられる光により励起されると波長変換光を発する蛍光体を含有する蛍光体層を前記搭載部上に形成する工程を有し、
前記ガラス封止工程は、前記蛍光体分散ガラスによる封止部と前記搭載部との接合部により前記回路パターン及び前記蛍光体層を取り囲む工程を有することを特徴とする請求項1あるいは2に記載の発光装置の製造方法。 - 前記搭載部準備工程は、前記搭載部の表面を粗面状に形成する工程を有し、
前記ガラス封止工程は、前記封止部の界面を前記搭載部の表面に沿って粗面状に形成する工程を有することを特徴とする請求項1から3のいずれか1項に記載の発光装置の製造方法。 - 前記搭載部準備工程は、前記搭載部を透光性材料によって形成する工程を有し、
前記回路パターンを形成する工程は、前記回路パターンを前記発光素子の近傍に形成し、
前記蛍光体層を形成する工程は、前記蛍光体層を前記回路パターン上に形成することを特徴とする請求項3に記載の発光装置の製造方法。 - 前記搭載部準備工程は、前記搭載部をセラミックによって形成する工程を有することを特徴とする請求項5に記載の発光装置の製造方法。
- 前記搭載部準備工程は、前記搭載部を形成する前記セラミックは多結晶アルミナであることを特徴とする請求項6に記載の発光装置の製造方法。
- 前記回路パターンを形成する工程は、前記回路パターンの表層を銀で形成することを特徴とする請求項3に記載の発光装置の製造方法。
- 前記搭載部準備工程は、前記発光素子として550nm未満の波長の光を発する発光素子を前記搭載部上に搭載する工程を有し、
前記回路パターンを形成する工程は、表層を金で形成し、
前記混合工程は、前記蛍光体として前記発光素子から発せられる光により励起されると550nm以上の波長の光を発する蛍光体を混合することを特徴とする請求項3に記載の発光装置の製造方法。 - 前記搭載部準備工程は、前記発光素子として青色光を発する発光素子を前記搭載部上に搭載する工程を有し、
前記混合工程は、前記蛍光体として前記青色光により励起されると黄色光を発する蛍光体を混合する工程を有することを特徴とする請求項9に記載の発光装置の製造方法。 - 前記搭載部準備工程は、前記発光素子として紫外光を発する発光素子を前記搭載部上に搭載する工程を有し、
前記混合工程は、前記蛍光体として前記紫外光により励起されると青色光を発する青色蛍光体と、前記紫外光により励起されると緑色光を発する緑色蛍光体と、前記紫外光により励起されると赤色光を発する赤色蛍光体と、を混合する工程を有することを特徴とする請求項1から8のいずれか1項に記載の発光装置の製造方法。 - 前記混合工程は、前記粉末状のガラスとしてZnO−SiO2−R2O系(RはI族の元素から選ばれる少なくとも1種)のガラスによって形成することを特徴とする請求項1から11のいずれか1項に記載の発光装置の製造方法。
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US20060231737A1 (en) * | 2005-04-15 | 2006-10-19 | Asahi Glass Company, Limited | Light emitting diode element |
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2006
- 2006-09-12 JP JP2006247285A patent/JP4905009B2/ja active Active
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2007
- 2007-09-11 CN CNB2007101453403A patent/CN100565951C/zh active Active
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20140031124A (ko) * | 2012-09-04 | 2014-03-12 | 세미크론 엘렉트로니크 지엠비에치 앤드 코. 케이지 | 전력반도체 모듈 및 전력반도체 모듈의 제조 방법 |
KR102020070B1 (ko) | 2012-09-04 | 2019-09-09 | 세미크론 엘렉트로니크 지엠비에치 앤드 코. 케이지 | 전력반도체 모듈 및 전력반도체 모듈의 제조 방법 |
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CN101145594A (zh) | 2008-03-19 |
US20080074029A1 (en) | 2008-03-27 |
US8523626B2 (en) | 2013-09-03 |
CN100565951C (zh) | 2009-12-02 |
JP2008071837A (ja) | 2008-03-27 |
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