JP2020515025A - 発光スペクトルを制御した超高演色白色発光素子及びこれを用いた照明装置 - Google Patents
発光スペクトルを制御した超高演色白色発光素子及びこれを用いた照明装置 Download PDFInfo
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Abstract
Description
(式1)
Tc(K)=3700(B/R)+1800
(式1)
Tc(K)=3700(B/R)+1800
半導体LEDチップとしては、ピーク波長は405nm、半値幅は30nmのInGaN/GaN多重量子井戸構造を発光層とするものを使用した。外形は520μm×390μmの長方形であった。
シリコーン樹脂と、更に沈降防止剤としてシリカパウダー(SiO2)を使用した。
蛍光体として、下記の蛍光体材料を使用した。
青色蛍光体:(Sr,Br)10(PO4)6Cl2:Eu
緑色蛍光体:SiAlON:EU
黄色蛍光体:(Ba,Sr)Si2(O,Cl)2N2:Eu
赤色蛍光体:CaAlSi(ON)2:Eu
深赤色蛍光体:CaAlSiN2:Eu
発光スペクトルの測定は、20〜65mAの順方向電流印加条件の下、室温で行った。測定装置は、光電子精密(株)(WITHLIGHT、韓国)製OPI−100を使用した。
[式1]
Tc=3700(B/R)+1800
図1〜6に示した様に、色温度が増加することに伴い、相対的に405nmの励起光である紫光の成分が強まり、赤の発光強度は弱まった。一方、緑の発光に於いては、赤の発光強度よりは強まらないように、また、ピークが現れないように緑色蛍光体の配合を調整することが重要である。そして、455nmの青の発光強度と、405nmの紫の発光強度比は3を超えないように青色蛍光体の重量を調整した。図7に示した様に、455nmの青の発光強度(B)と630nmの赤の発光(R)の強度比は、色温度(Tc)について比例関係にあることが分かった。この事実は、超高演色白色LED素子を得るために非常に重要な関係であり、この方程式(Tc=3700(B/R)+1800)は、適切な色温度の調整のために、それぞれの蛍光体の比率を設定することの基準となる。
図1〜6の特性を有する白色LEDの発光スペクトルに於いて、その形状を分析してみると、殆どの色温度で、約450nmより長波長領域に於いて滑らかなスペクトル形状が現れる。注目すべきことは、480〜500nmにかけてスペクトルが滑らかに繋がっているので、故意に青緑色蛍光体を添加する必要はないということが解る。
上述の実施例の様に、5種類の蛍光体を混合するため、カスケード(Cascade)励起による励起エネルギーの損失が予測されたにも関わらず、発光効率は、65mAの時に、最大110lm/Wを得ることができた。これは、重なる実験を通し、複数の蛍光体間の相関関係による最適比率と最適の蛍光体の組み合わせの設計が可能になったからである。
Claims (8)
- 380nm以上430nm以下に発光のピークを有する、紫波長領域の光を出す半導体LEDチップ及び前記紫LEDチップの励起波長により励起され、発光する透明樹脂層に分布している蛍光体層を含む超高演色白色発光素子であって、
前記蛍光体層は、
450〜470nmに発光のピークを有する第1蛍光体、
510〜550nmに発光のピークを有する第2蛍光体、
550〜590nmに発光のピークを有する第3蛍光体、
630〜660nmに発光のピークを有する第4蛍光体、及び
660〜730nmに発光のピークを有する第5蛍光体を含み、
前記超高演色白色発光素子は、平均演色評価数(Ra)が98以上100未満、特殊演色評価数(Ri)のR9(赤)とR12(青)は、それぞれ、94以上100未満であり、発光効率は80lm/W以上であることを特徴とする、前記超高演色白色発光素子。 - 前記第1蛍光体、前記第2蛍光体、前記第3蛍光体、前記第4蛍光体及び前記第5蛍光体の重量比は7.3〜24.0:1.0:0.4〜10:4.6〜14.0:0.2〜0.6であることを特徴とする、請求項1に記載の超高演色白色発光素子。
- 前記超高演色白色発光素子は、2700K〜6500Kの各相関色温度の発光スペクトルにおいて、630nmの赤の発光強度(R)と455nmの青の発光強度(B)の強度比に関する相関色温度(Tc)は、下記の(式1)を満足することを特徴とする、請求項1に記載の超高演色白色発光素子。
(式1)
Tc(K)=3700(B/R)+1800 - 前記超高演色白色発光素子の発光スペクトルは、可視光波長領域の430nm〜630nmにおいて連続的に繋がり、直線又は滑らかなスペクトル分布を持つことを特徴とする、請求項1に記載の超高演色白色発光素子。
- 前記超高演色白色発光素子は、4500K以上の相関色温度領域において、発光スペクトルは可視光波長領域の430nm〜630nmの間で連続的に繋がり、波長の増加によるスペクトルの減少比率は10%未満であり、平均演色評価数(Ra)は98〜100であることを特徴とする、請求項1に記載の超高演色白色発光素子。
- 前記超高演色白色発光素子は、4500K未満の相関色温度領域において、発光スペクトルは可視光波長領域の430nm〜630nmの間で連続的に繋がり、波長の増加によるスペクトルの増加比率は50%未満であり、平均演色評価数(Ra)は98〜100であることを特徴とする、請求項1に記載の超高演色白色発光素子。
- 請求項1〜請求項6のいずれか1項に記載の超高演色白色発光素子を含む白色発光モジュール。
- 前記白色発光モジュールは、それぞれ違う色温度を持つ2種類以上の超高演色白色発光素子を含むことを特徴とする、請求項7に記載の白色発光モジュール。
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PCT/KR2018/006296 WO2019182194A1 (ko) | 2018-03-21 | 2018-06-01 | 발광 스펙트럼을 제어한 초고연색 백색 발광 소자 및 이를 포함하는 조명 장치 |
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US11942577B2 (en) * | 2019-08-22 | 2024-03-26 | Grirem Advanced Materials Co., Ltd. | Optical device |
CN113054083A (zh) * | 2019-12-27 | 2021-06-29 | 英特美光电(苏州)有限公司 | 一种5000k超高显光谱荧光粉 |
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CN102405538A (zh) * | 2009-08-26 | 2012-04-04 | 三菱化学株式会社 | 白色半导体发光装置 |
JP2011054365A (ja) | 2009-08-31 | 2011-03-17 | Kokuyo Co Ltd | 照明器具 |
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JP5672985B2 (ja) * | 2010-11-04 | 2015-02-18 | 三菱化学株式会社 | 半導体白色発光装置 |
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- 2018-06-01 US US16/098,224 patent/US11127888B2/en active Active
- 2018-06-01 WO PCT/KR2018/006296 patent/WO2019182194A1/ko unknown
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Also Published As
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US11127888B2 (en) | 2021-09-21 |
EP3567644A1 (en) | 2019-11-13 |
KR101990475B1 (ko) | 2019-06-19 |
EP3567644A4 (en) | 2020-12-23 |
JP6854831B2 (ja) | 2021-04-07 |
US20200357962A1 (en) | 2020-11-12 |
WO2019182194A1 (ko) | 2019-09-26 |
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