JP7356311B2 - 発光装置、波長変換ユニット、及びヘッドライト又は表示装置 - Google Patents
発光装置、波長変換ユニット、及びヘッドライト又は表示装置 Download PDFInfo
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- JP7356311B2 JP7356311B2 JP2019177695A JP2019177695A JP7356311B2 JP 7356311 B2 JP7356311 B2 JP 7356311B2 JP 2019177695 A JP2019177695 A JP 2019177695A JP 2019177695 A JP2019177695 A JP 2019177695A JP 7356311 B2 JP7356311 B2 JP 7356311B2
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Description
[2]前記光散乱層の厚さが、50μm以上、200μm以下の範囲内にある、上記[1]に記載の発光装置。
[3]前記蛍光体層の厚さが、50μm以上、100μm以下の範囲内にある、上記[1]又は[2]に記載の発光装置。
[4]前記光散乱層が、前記蛍光体層の材料から、前記蛍光体層に含まれる蛍光体の賦活剤を抜いた材料からなる、上記[1]~[3]のいずれか1項に記載の発光装置。
[5]前記パッケージが、前記光透過性放熱部材及び前記高熱伝導部材と接合された、上記[1]~[4]のいずれか1項に記載の発光装置。
[6]前記パッケージの内部の前記発光素子が収容される空間が、前記パッケージと前記波長変換ユニットにより気密封止された、上記[1]~[5]のいずれか1項に記載の発光装置。
[7]前記波長変換部材の側面の前記光透過性放熱部材側の一部又は全体が、前記光透過性放熱部材側に向かって前記波長変換部材の幅が狭くなるような傾斜面を有する、上記[1]~[6]のいずれか1項に記載の発光装置。
[8]前記傾斜面と前記光透過性放熱部材の上面が光反射性接着材により接着された、上記[1]~[7]のいずれか1項に記載の発光装置。
[9]前記側方放熱部材が、前記光透過性放熱部材の上面及び前記高熱伝導部材の下面に接し、かつ波長変換部材の側面に直接又は光反射材を介して接する板状の放熱部材を含み、前記高熱伝導部材の熱伝導率が前記放熱部材の熱伝導率よりも高く、前記放熱部材の熱伝導率が、前記光透過性放熱部材の熱伝導率よりも高い、上記[1]~[8]のいずれか1項に記載の発光装置。
[10]前記放熱部材が、前記波長変換部材の側面との間に空隙を設けるための凹部を前記波長変換部材側の側部に有する、上記[9]に記載の発光装置。
[11]前記空隙内に光反射部材が設けられた、上記[10]に記載の発光装置。
[12]前記高熱伝導部材と前記パッケージに挟まれたシール部材により前記パッケージの内部が気密封止された、上記[1]~[11]のいずれか1項に記載の発光装置。
[13]ヘッドライト又は表示装置に用いられる、上記[1]~[12]のいずれか1項に記載の発光装置。
[14]蛍光体を含む蛍光体層と、前記蛍光体の励起光を散乱するための光散乱層とが積層された波長変換部材と、前記波長変換部材の前記光散乱層の表面に接する、前記励起光を透過する板状の光透過性放熱部材と、前記波長変換部材の側面に光反射部材を介して接する高熱伝導部材を含み、前記光透過性放熱部材の上面に接する板状の側方放熱部材と、を備え、前記光透過性放熱部材の熱伝導率が前記波長変換部材の熱伝導率よりも高く、前記高熱伝導部材の熱伝導率が前記光透過性放熱部材の熱伝導率よりも高い、波長変換ユニット。
[15]前記光散乱層の厚さが、50μm以上、200μm以下の範囲内にある、上記[14]に記載の波長変換ユニット。
[16]前記蛍光体層の厚さが、50μm以上、100μm以下の範囲内にある、上記[14]又は[15]に記載の波長変換ユニット。
[17]前記光散乱層が、前記蛍光体層の材料から、前記蛍光体層に含まれる蛍光体の賦活剤を抜いた材料からなる、上記[14]~[16]のいずれか1項に記載の波長変換ユニット。
[18]ヘッドライト又は表示装置に用いられる、上記[14]~[17]のいずれか1項に記載の波長変換ユニット。
[19]上記[1]~[12]のいずれか1項に記載の発光装置を有する、ヘッドライト又は表示装置。
[20]上記[14]~[17]のいずれか1項に記載の波長変換ユニットを有する、ヘッドライト又は表示装置。
(発光装置の構成)
図1は、第1の実施の形態に係る発光装置1の垂直断面図である。発光装置1は、発光素子20と、発光素子20から発せられる光を透過する板状の光透過性放熱部材11と、積層された光散乱層12aと蛍光体層12bを有し、発光素子20から発せられて光透過性放熱部材11を透過する光を光散乱層12a側から取り込んで、蛍光体層12bにおいて波長を変換する、波長変換部材12と、波長変換部材12の側面に光反射部材14を介して接する高熱伝導部材13と、発光素子20を収容するパッケージ21と、を備える。
第2の実施の形態に係る発光装置2は、主に、後述する放熱部材17をさらに備える点において、第1の実施の形態に係る発光装置1と異なる。なお、第1の実施の形態と同様の部材については、同じ符号を付し、その説明を省略又は簡略化する。
図6は、第2の実施の形態に係る発光装置2の垂直断面図である。発光装置2は、光透過性放熱部材11と高熱伝導部材13の間に板状の放熱部材17を備える。放熱部材17の側面は波長変換部材12の側面に接し、上面は高熱伝導部材13の下面に接し、下面は光透過性放熱部材11の上面に接する。
第3の実施の形態に係る発光装置3は、高熱伝導部材とパッケージでシール部材を挟み込むことによるシール構造を有する点において、第2の実施の形態に係る発光装置2と異なる。なお、第2の実施の形態と同様の部材については、同じ符号を付し、その説明を省略又は簡略化する。
図10は、第3の実施の形態に係る発光装置3の垂直断面図である。発光装置3においては、高熱伝導部材13がパッケージ21の上方及び側方を覆うようなカップ状の形状を有し、その開口部の縁から外周側に張り出した、パッケージ21に固定するための固定部13bを有する。また、高熱伝導部材13は、例えば、SUS、Cu、Al、CMC(Cu/Mo/Cu積層体)、Cu/AlN/Cu積層体、含浸カーボンなどからなる。パッケージ21は、シール部材26を収容するための凹部21aと、底部近傍から外周側に張り出した、高熱伝導部材13を固定するための被固定部21bを有する。
上記の第1~3の実施の形態に係る発光装置1、2、3によれば、波長変換部材12に光散乱層12aを用いることにより蛍光体層12bの発熱量を抑え、かつ高熱伝導部材13などの波長変換部材12の周辺部材により蛍光体層12bの熱を効果的に逃がすことができるため、蛍光体層12bに含まれる蛍光体の温度消光を効果的に抑制することができる。発光装置1、2、3、及びこれらに含まれる波長変換ユニット100、200は、例えば、光源装置、ヘッドライト、表示装置などへ適用することができる。
11、15 光透過性放熱部材
12 波長変換部材
12a 光散乱層
12b 蛍光体層
13 高熱伝導部材
14 光反射部材
15b AR膜
15c DBR膜
17 放熱部材
17a 凹部
18 光反射部材
19 高放熱光反射材
20 発光素子
21 パッケージ
100、200 波長変換ユニット
Claims (13)
- 発光素子と、
前記発光素子から発せられる光を透過する板状の光透過性放熱部材と、
積層された光散乱層と蛍光体層を有し、前記発光素子から発せられて前記光透過性放熱部材を透過する光を前記光散乱層側から取り込んで、前記蛍光体層において波長を変換する、波長変換部材と、
前記波長変換部材の側面に光反射部材を介して接する高熱伝導部材を含み、前記波長変換部材で生じた熱が逃げる前記光透過性放熱部材の上面に接することにより、前記波長変換部材で生じた熱が前記光反射部材及び前記光透過性放熱部材を介して逃げる、板状の側方放熱部材と、
前記発光素子を収容し、前記光透過性放熱部材、前記波長変換部材、及び前記側方放熱部材を含む波長変換ユニットを支持するパッケージと、
を備え、
前記波長変換部材の側面の前記光透過性放熱部材側の一部又は全体が、前記光透過性放熱部材側に向かって前記波長変換部材の幅が狭くなるような傾斜面を有し、当該傾斜面と前記光透過性放熱部材の上面が光反射性接着材により接着された、
発光装置。 - 前記光散乱層の厚さが、50μm以上、200μm以下の範囲内にある、
請求項1に記載の発光装置。 - 前記蛍光体層の厚さが、50μm以上、100μm以下の範囲内にある、
請求項1又は2に記載の発光装置。 - 前記光散乱層が、前記蛍光体層の材料から、前記蛍光体層に含まれる蛍光体の賦活剤を抜いた材料からなる、
請求項1~3のいずれか1項に記載の発光装置。 - 前記パッケージが、前記光透過性放熱部材及び前記高熱伝導部材と接合された、
請求項1~4のいずれか1項に記載の発光装置。 - 前記パッケージの内部の前記発光素子が収容される空間が、前記パッケージと前記波長変換ユニットにより気密封止された、
請求項1~5のいずれか1項に記載の発光装置。 - 前記高熱伝導部材と前記パッケージに挟まれたシール部材により前記パッケージの内部が気密封止された、
請求項1~6のいずれか1項に記載の発光装置。 - ヘッドライト又は表示装置に用いられる、
請求項1~7のいずれか1項に記載の発光装置。 - 蛍光体を含む蛍光体層と、前記蛍光体の励起光を散乱するための光散乱層とが積層された波長変換部材と、
前記波長変換部材の前記光散乱層の表面に接する、前記励起光を透過する板状の光透過性放熱部材と、
前記波長変換部材の側面に光反射部材を介して接する高熱伝導部材を含み、前記波長変換部材で生じた熱が逃げる前記光透過性放熱部材の上面に接することにより、前記波長変換部材で生じた熱が前記光反射部材及び前記光透過性放熱部材を介して逃げる板状の側方放熱部材と、
を備え、
前記波長変換部材の側面の前記光透過性放熱部材側の一部又は全体が、前記光透過性放熱部材側に向かって前記波長変換部材の幅が狭くなるような傾斜面を有し、当該傾斜面と前記光透過性放熱部材の上面が光反射性接着材により接着され、
前記光透過性放熱部材の熱伝導率が前記波長変換部材の熱伝導率よりも高く、
前記高熱伝導部材の熱伝導率が前記光透過性放熱部材の熱伝導率よりも高い、
波長変換ユニット。 - 前記光散乱層の厚さが、50μm以上、200μm以下の範囲内にある、
請求項9に記載の波長変換ユニット。 - 前記蛍光体層の厚さが、50μm以上、100μm以下の範囲内にある、
請求項9又は10に記載の波長変換ユニット。 - 前記光散乱層が、前記蛍光体層の材料から、前記蛍光体層に含まれる蛍光体の賦活剤を抜いた材料からなる、
請求項9~11のいずれか1項に記載の波長変換ユニット。 - ヘッドライト又は表示装置に用いられる、
請求項9~12のいずれか1項に記載の波長変換ユニット。
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