JP6604543B2 - 発光装置 - Google Patents
発光装置 Download PDFInfo
- Publication number
- JP6604543B2 JP6604543B2 JP2015530984A JP2015530984A JP6604543B2 JP 6604543 B2 JP6604543 B2 JP 6604543B2 JP 2015530984 A JP2015530984 A JP 2015530984A JP 2015530984 A JP2015530984 A JP 2015530984A JP 6604543 B2 JP6604543 B2 JP 6604543B2
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- Prior art keywords
- layer
- light emitting
- phosphor
- emitting device
- light
- Prior art date
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Description
[15]前記金属膜は、Au、Ag、Pd、Pt、Sn、Ni、Cr、Fe、又はそれらを含有する合金からなる、前記[1]〜[14]のいずれか1項に記載の発光装置。
(発光装置の構成)
図1Aは、第1の実施の形態に係る発光装置の上面図である。図1Bは、図1Aの線分A−Aで切断した発光装置の垂直断面図である。発光装置10は、リモート蛍光体を利用した発光装置である。ここで、リモート蛍光体とは、発光装置内において蛍光体層と発光素子とを離して設置する技術である。
第2の実施の形態は、側壁の構成において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略又は簡略化する。
図2は、第2の実施の形態に係る発光装置の垂直断面図である。発光装置20は、金属パッド11と、金属パッド11上に搭載されたLED素子12と、LED素子12を囲む側壁23と、接着層14を介して側壁23に固定され、LED素子12の上方に位置する蛍光体層15と、を有する。
第3の実施の形態は、蛍光体層の構成において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略又は簡略化する。
図5は、第3の実施の形態に係る発光装置の部分的に拡大された垂直断面図である。発光装置30は、金属パッド11と、金属パッド11上に搭載されたLED素子12と、LED素子12を囲む、LED素子12側の側面に金属層13aを有する側壁13と、接着層14を介して側壁13の金属層13aに固定され、表面の接着層14と接触する部分に金属膜35aを有し、LED素子12の上方に位置する蛍光体層35と、を有する。蛍光体層を除いて、発光装置30の構成は第1の実施の形態の発光装置10と同様である。
第4の実施の形態は、蛍光体層の構成において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略又は簡略化する。
図6Aは、第4の実施の形態に係る発光装置の部分的に拡大された垂直断面図である。発光装置40は、金属パッド11と、金属パッド11上に搭載されたLED素子12と、LED素子12を囲む、LED素子12側の側面に金属層13aを有する側壁13と、接着層14を介して側壁13の金属層13aに固定され、LED素子12側の面上の接着層14と接触する部分に凹凸部45aを有し、LED素子12の上方に位置する蛍光体層45と、を有する。蛍光体層を除いて、発光装置40の構成は第1の実施の形態の発光装置10と同様である。
第5の実施の形態は、蛍光体層の構成において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略又は簡略化する。
図7は、第5の実施の形態に係る発光装置の垂直断面図である。発光装置50は、金属パッド11と、金属パッド11上に搭載されたLED素子12と、LED素子12を囲む側壁13と、接着層14を介して側壁13に固定され、LED素子12の上方に位置する蛍光体層51と、を有する。
第6の実施の形態は、蛍光体層が放熱部材に直接接続される点において、第2の実施の形態と異なる。なお、第2の実施の形態と同様の点については、説明を省略又は簡略化する。
図8A、図8B及び図9は、第6の実施の形態に係る発光装置の垂直断面図である。発光装置60a、60b、60cは、それぞれ、金属板21と、金属板21上に設置された絶縁基板22と、絶縁基板22上に設置されたLED素子12と、ヒートシンク等の放熱部材27と、LED素子12の上方及び側方を覆い、前記放熱部材27に直接接続される蛍光体層65と、を有する。
上記の第1〜6の実施の形態によれば、放熱経路を設けて蛍光体層の熱を効率的に放出することにより、蛍光体の温度消光に起因する発光装置の発光強度の低下や発光色の変化を抑制することができる。また、蛍光体層が単結晶蛍光体、セラミック蛍光体、又は蛍光体粒子を含むガラスからなり、蛍光体層自体の熱伝導率が高い場合には、より効率よく放熱することができる。
Claims (15)
- 480nm以下のピーク波長を有する光を発する発光素子と、
前記発光素子と離れて設置された、前記発光素子の発する光の波長を変換可能な蛍光体層と、
前記蛍光体層で発生した熱を排出する放熱部材と、
を有し、
前記蛍光体層は、単結晶蛍光体、セラミック蛍光体、蛍光体粒子を含むガラスからなる層、又は1W/(m・K)以上の熱伝導率を有する透明基板とその表面上に形成された蛍光体粒子を含む樹脂層とを含む層であり、
前記蛍光体層と前記放熱部材との間に、前記蛍光体層に接する金属膜と、前記金属膜と前記放熱部材を接着する接着層とが介在し、
前記接着層は、粒子を含有する樹脂からなり、前記粒子の熱伝導率が前記樹脂の熱伝導率よりも高い樹脂層、又は半田からなる層である、
発光装置。 - 480nm以下のピーク波長を有する光を発する発光素子と、
前記発光素子の発する光の波長を変換可能な蛍光体層と、
前記蛍光体層で発生した熱を排出する放熱部材としての、前記発光素子が搭載された金属パッドと、
前記発光素子を囲む側壁と、
を有し、
前記蛍光体層は、単結晶蛍光体、セラミック蛍光体、蛍光体粒子を含むガラスからなる層、又は透明基板とその表面上に形成された蛍光体粒子を含む樹脂層とを含む層であり、
前記蛍光体層は、前記発光素子の上方を覆う、前記側壁に接着層を介して接続される層であり、表面の前記接着層と接触する部分に金属膜を有し、
前記側壁は、前記発光素子を囲む絶縁性の基体と、前記基体の前記発光素子側の側面に形成された金属層を有し、前記金属層は前記金属パッド及び前記接着層に接触し、
前記接着層は、粒子を含有する樹脂からなり、前記粒子の熱伝導率が前記樹脂の熱伝導率よりも高い樹脂層、又は半田からなる層であり、
前記金属パッドは、電気的に分離された2つの領域を有し、
前記発光素子は、前記金属パッドの前記2つの領域に電気的に接続され、
前記金属層は、少なくとも2つの電気的に分離された領域を有し、前記電気的に分離された領域の各領域は、前記金属パッドの前記2つの領域のいずれか一方にのみ接触する、
発光装置。 - 前記放熱部材は、前記発光素子の下方に位置するヒートシンクを含む、
請求項1に記載の発光装置。 - 前記透明基板の母材は、ガラス、酸化ガリウム、酸化亜鉛、サファイア、シリコンカーバイド、又はダイヤモンドである、
請求項1〜3のいずれか1項に記載の発光装置。 - 前記透明基板は、熱伝導率が1W/(m・K)以上であり、前記発光素子の発光波長、及び蛍光波長に対する透過率が80%以上である、
請求項1〜4のいずれか1項に記載の発光装置。 - 前記蛍光体粒子は、単結晶蛍光体の粒子である、
請求項1〜5のいずれか1項に記載の発光装置。 - 前記接着層は半田からなる、
請求項1〜6のいずれか1項に記載の発光装置。 - 前記蛍光体層は、前記発光素子側の面上の前記接着層と接触する部分に前記蛍光体層の厚さの10%以上の深さの凹凸を有する、
請求項1〜7のいずれか1項に記載の発光装置。 - 前記接着層の熱伝導率は3W/(m・K)以上である、
請求項1〜8のいずれか1項に記載の発光装置。 - 前記発光素子から発せられて前記蛍光体層に入射する光の放射束密度が1.8W/cm2以上である、
請求項1〜9のいずれか1項に記載の発光装置。 - 前記蛍光体層の下面の前記接着層に接触している面積の波長変換に寄与する領域の面積に対する割合は35%以上である、
請求項1〜10のいずれか1項に記載の発光装置。 - 前記割合は70%以上である、
請求項11に記載の発光装置。 - 前記蛍光体層は、透明基板とその表面上に形成された蛍光体粒子を含む樹脂層とを含む層であり、
前記樹脂層中の前記蛍光体粒子の質量パーセント濃度が50質量%以上である、
請求項1〜12のいずれか1項に記載の発光装置。 - 前記質量パーセント濃度が57質量%以上である、請求項13に記載の発光装置。
- 前記金属膜は、Au、Ag、Pd、Pt、Sn、Ni、Cr、Fe、又はそれらを含有する合金からなる、
請求項1〜14のいずれか1項に記載の発光装置。
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2014
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- 2014-08-08 EP EP14834996.2A patent/EP3032594A4/en not_active Withdrawn
- 2014-08-08 CN CN201480042506.7A patent/CN105684170B/zh active Active
- 2014-08-08 US US14/911,162 patent/US9634216B2/en active Active
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KR102374060B1 (ko) * | 2021-06-25 | 2022-03-14 | 이효찬 | 광로 유도형 발광 다이오드 조명 모듈 |
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JP2020010063A (ja) | 2020-01-16 |
US20170186923A1 (en) | 2017-06-29 |
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US20160190418A1 (en) | 2016-06-30 |
EP3032594A1 (en) | 2016-06-15 |
WO2015020205A1 (ja) | 2015-02-12 |
US10340429B2 (en) | 2019-07-02 |
CN105684170A (zh) | 2016-06-15 |
CN105684170B (zh) | 2019-09-03 |
EP3032594A4 (en) | 2017-01-25 |
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