JP2011089117A - 波長変換粒子およびそれを用いた波長変換部材ならびに発光装置 - Google Patents
波長変換粒子およびそれを用いた波長変換部材ならびに発光装置 Download PDFInfo
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Abstract
【解決手段】波長変換部材70の波長変換粒子7は、蛍光体粒子71の表面側に微細凹凸構造を有するモスアイ状構造部74を備え、当該微細凹凸構造が蛍光体粒子71自体に形成されている。波長変換部材70は、波長変換粒子7が当該波長変換粒子7の蛍光体粒子71よりも屈折率が小さな透光性媒体73に分散されてなり、蛍光体粒子71の表面側に、モスアイ状構造部74とモスアイ状構造部74の先細り状の微細突起75間に入り込んだ透光性媒体73とで構成される反射防止部76を備えている。発光装置1は、LEDチップ10から放射される光の一部を当該光よりも長波長の光に変換して放射する色変換部材として波長変換部材70を用いている。
【選択図】図1
Description
本実施形態では、図1(a)および図2に示すようにLEDチップ10と波長変換部材70とを備えた発光装置1について説明した後で、蛍光体粒子71を用いて形成された波長変換粒子7およびそれを用いた波長変換部材70について説明する。
本実施例では、実施形態1の発光装置1において、LEDチップ10として発光ピーク波長が460nmの青色LEDチップを採用し、波長変換部材70に関して、透光性媒体73として、屈折率が1.4のシリコーン樹脂を採用し、蛍光体粒子71に関して、緑色蛍光体粒子として組成がCaSc2O4:Ce3+で屈折率が1.9、中心粒径d50が8μmの蛍光体粒子を採用し、赤色蛍光体粒子として組成がCaAlSiN3:Eu2+で屈折率が2.0、中心粒径d50が10μmの蛍光体粒子を採用している。
ところで、実施例1で説明した発光装置1では、光出力の高出力化を図れるが、信頼性加速試験の試験開始から1000時間が経過した後の光束が試験開始前から低下しているが、これは、波長変換部材70における波長変換粒子7の蛍光体粒子71が外部からの水分を吸収して蛍光体粒子7の特性が低下したためであると考えられる。
本実施例では実施形態2の発光装置1において、LEDチップ10として発光ピーク波長が460nmの青色LEDチップを採用し、波長変換部材70に関して、透光性媒体73として、屈折率が1.4のシリコーン樹脂を採用し、蛍光体粒子71に関して、緑色蛍光体粒子として組成がCaSc2O4:Ce3+で屈折率が1.9、中心粒径d50が8μmの蛍光体粒子を採用し、赤色蛍光体粒子として組成がCaAlSiN3:Eu2+で屈折率が2.0、中心粒径d50が10μmの蛍光体粒子を採用している。
7 波長変換粒子
10 LEDチップ
70 波長変換部材(色変換部材)
71 蛍光体粒子
73 透光性媒体
74 モスアイ状構造部
75 微細突起
76 反射防止部
77 金属酸化物層
Claims (6)
- 蛍光体粒子を用いて形成され入射した励起光を吸収して励起光よりも長波長の光を放射する波長変換粒子であって、蛍光体粒子の表面側に微細凹凸構造を有するモスアイ状構造部を備え、当該微細凹凸構造が蛍光体粒子自体に形成されてなることを特徴とする波長変換粒子。
- 前記蛍光体粒子の前記表面側に、透光性の金属酸化物層が形成されてなることを特徴とする請求項1記載の波長変換粒子。
- 請求項1記載の前記波長変換粒子が前記蛍光体粒子よりも屈折率が小さな透光性媒体に分散されてなり、前記蛍光体粒子の前記表面側に、前記モスアイ状構造部と前記モスアイ状構造部の先細り状の微細突起間に入り込んだ前記透光性媒体とで構成される反射防止部を備えてなることを特徴とする波長変換部材。
- 請求項2記載の前記波長変換粒子が前記蛍光体粒子よりも屈折率が小さく且つ前記金属酸化物層と略同一の屈折率を有する透光性媒体に分散されてなり、前記蛍光体粒子の表面側に、前記モスアイ状構造部と前記モスアイ状構造部の先細り状の微細突起間に入り込んだ前記金属酸化物層とで構成される反射防止部を備えることを特徴とする波長変換部材。
- 前記透光性媒体は、シリコーン樹脂もしくはガラスであることを特徴とする請求項3または請求項4記載の波長変換部材。
- LEDチップと、LEDチップから放射される光の一部を当該光よりも長波長の光に変換して放射する色変換部材とを備え、当該色変換部材として請求項3ないし請求項5のいずれか1項に記載の波長変換部材を用いてなることを特徴とする発光装置。
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TW201132740A (en) | 2011-10-01 |
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