JP2003529889A5 - - Google Patents

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JP2003529889A5
JP2003529889A5 JP2000572951A JP2000572951A JP2003529889A5 JP 2003529889 A5 JP2003529889 A5 JP 2003529889A5 JP 2000572951 A JP2000572951 A JP 2000572951A JP 2000572951 A JP2000572951 A JP 2000572951A JP 2003529889 A5 JP2003529889 A5 JP 2003529889A5
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light
light emitting
lighting device
emitting diode
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【特許請求の範囲】
【請求項1】 2つの原色光源を形成する、少なくとも2個の光放出ダイオードを具え、各光放出ダイオードが動作中予め選択した波長域の可視光を放出する照明装置において、
当該照明装置が、二次光源を形成する、前記光放出ダイオードから放出された可視光の一部を別の波長域の可視光に変換する変換手段を具え、2つの原色光源に基づく照明装置に比較して改善された演色性を得るように構成したことを特徴とする照明装置。
【請求項2】 前記変換手段が発光材料を有することを特徴とする請求項1に記載の照明装置。
【請求項3】 前記発光材料が400〜500nmの波長域の光により励起されることを特徴とする請求項2に記載の照明装置。
【請求項4】 前記発光材料が、(Sr,Ca)2 SiO4 :Eu2+、BaSiO4 :Eu2+、SrCa24 、ZnS:Cu+ 、ZnS:Au + 、ZnS:Al3+、(Zn,Cd)S:Ag+ 、及びCaS:Ce3+により構成されるグループから選択したことを特徴とする請求項2に記載の照明装置。
【請求項5】 前記少なくとも2個の光放出ダイオードが、少なくとも1個の青の光放出ダイオードと、少なくとも1個の赤の光放出ダイオードとを有し、前記変換手段が、青の光放出ダイオードから放出された光の一部を緑の光に変換する発光材料を含むことを特徴とする請求項1に記載の照明装置。
【請求項6】 前記青の光放出ダイオードの最大スペクトラル放出波長が460〜490nmの波長域にあり、前記赤の光放出ダイオードの最大スペクトラル放出波長が610〜630nmの波長域にあり、前記緑の光の発光材料の最大スペクトラル放出波長が510〜530nmの波長域にあることを特徴とする請求項5に記載の照明装置。
【請求項7】 前記発光材料が、500〜560nmの波長域の光により励起されることを特徴とする請求項2に記載の照明装置。
【請求項8】 前記発光材料が、CaS:Eu,Mn;CaS:Eu;SrS:Eu;(Zn,Cd)S:Ag;SrO:Eu;Sr326 :Eu;Sr2Mg(BO32 ;CaS:Eu,Mn;CaS:Eu;又はSrS:Euにより構成されるグループから選択したことを特徴とする請求項7に記載の照明装置。
【請求項9】 前記少なくとも2個の光放出ダイオードが、少なくとも1個の青の光放出ダイオードと、少なくとも1個の緑の光放出ダイオードとを有し、前記変換手段が、青の光放出ダイオード及び/又は緑の光放出ダイオードから放出された光の一部を赤の光に変換する発光材料を含むことを特徴とする請求項1に記載の照明装置。
【請求項10】 前記青の光放出ダイオードの最大スペクトラル放出波長が460〜490nmの波長域にあり、前記緑の光放出ダイオードの最大スペクトラル放出波長が510〜530nmの波長域にあり、前記赤の光の発光材料の最大スペクトラル放出波長が610〜630nmの波長域にあることを特徴とする請求項9に記載の照明装置。
【請求項11】 前記照明装置の演色評価数を少なくとも80に等しいか又はそれよりも大きくしたことを特徴とする請求項1又は2に記載の照明装置。
【請求項12】 動作中、前記光放出ダイオードの光束が少なくとも5lmに等しいことを特徴とする請求項1又は2に記載の照明装置。
【請求項13】 照明装置に反射手段が設けられていることを特徴とする請求項1又は2に記載の照明装置。
【請求項14】 前記反射手段を、BaSO4 、ZnS、ZnO及びTiO2 から形成されるグループから選択した材料を含むことを特徴とする請求項13に記載の照明装置。
【請求項15】 前記変換手段が、前記反射手段の内部又は前記反射手段上に設けられていることを特徴とする請求項13又は14に記載の照明装置。
【請求項16】 照明装置の色温度が、前記光放出ダイオードを個別に駆動することにより調整できることを特徴とする請求項1又は2に記載の照明装置。
適当な発光材料は、(Sr,Ca)2 SiO4 :Eu2+、BaSiO4 :Eu2+、SrCa24 、ZnS:Cu+ 、ZnS:Au + 、ZnS:Al3+、(Zn,Cd)S:Ag+ 、及びCaS:Ce3+である。これらの材料比較的高い量子効率温度450nmおける光吸収性を有する。これらの材料は、青の光が所望の緑の光に変換されるとき、極めて高い等価輝度を呈する。
本発明の第1の概念による照明装置の極めて優れた実施例は、少なくとも2個の光放出ダイオードが、1個の青の光放出ダイオードと、少なくとも1個の赤の光放出ダイオードとを有し、前記変換手段が、青の光放出ダイオードから放出された光の一部を緑の光に変換する発光材料を含むことを特徴とする。このように、青及び赤の二色の原色光源が使用され、青の光の一部を変換することによって緑の光が得られ、三原色(赤、青及び緑)に基づいて高い演色性を有する白色光を放出する本発明の第1の概念による照明装置が得られる。好ましくは、青の光放出ダイオードの最大スペクトラル放出波長が460〜490nmの波長域にあり、赤の光放出ダイオードの最大スペクトラル放出波長が610〜630nmの波長域にあり、(緑の光放出)発光材料の最大スペクトラル放出波長が510〜530nmの波長域にある。
本発明の第2の概念では、発光物質は、500〜560nmの波長域の光により励起される。この感度のために、発光材料は、特に緑の光の吸収に極めて相応しく使用することができる。この吸収された光は、発光物質によって、例えば赤の光の、更なる波長域の可視光に極めて効率的に変換される。
適当な発光材料は、CaS:Eu,Mn;CaS:Eu;SrS:Eu;(Zn,Cd)S:Ag;SrO:Eu;Sr 3 2 6 :Eu;Sr 2 Mg(BO 3 2 ;CaS:Eu,Mn;CaS:Eu;又はSrS:Euである。前記材料は、比較的高い量子効率及び光吸収を有する。これらの材料は、更に、青の光又は緑の光が所望の赤の光に変換されたときに、比較的極めて高い等価輝度を示す。
本発明の第2の概念による照明装置の極めて優れた実施例は、少なくとも2個の光放出ダイオードが、1個の青の光放出ダイオードと、少なくとも1個の緑の光放出ダイオードとを有し、前記変換手段が、青及び/又は緑の光放出ダイオードから放出された光の一部を緑の光に変換する発光材料を含むことを特徴とする。青及び緑のLEDを原色光源として用いることの重要な利点は、両方のダイオードチィップを既知のGaN技術により製造できることである。赤のGaPダイオードチィップとは異なり、これら青及び緑のGaNダイオードは温度依存性がないので、これらダイオードチィップの温度依存性を補償するための比較的高価な電子回路を用いることを省略することができる。別の利点は、青及び緑のGaNダイオードはは同一の側に配置することができるので、これらのダイオードは容易に直列に配置することができることである。緑の光により励起され赤の光を放出する発光材料を用いることは、青の光により励起し赤の光を放出する発光材料に比べて量子欠損が小さい別の利点がある。好ましくは、青の光放出ダイオードの最大スペクトラル放出波長は460〜490nmの波長域に存在し、緑の光放出ダイオードの最大スペクトラル放出波長は510〜550nmの波長域に存在し、赤の光発光材料の最大スペクトラル放出波長は610〜630nmの波長域に存在する。
本発明の第1及び第2の概念による照明装置の演色評価数(Ra )は、好ましくは80に等しいか又はそれよりも大きくする(Ra ≧80)。少なくとも2個のLEDにより形成される2個の原色光源のスペクトラル放出波長と、変換手段により変換された後別の波長域の可視光を放出する1個の二次光源のスペクトラル放出波長とを適切に組み合わせることにより、高い演色性を有する照明装置が得られる。
本発明の照明装置の特別に注目すべき点は、LEDからの光と変換手段からの光を混合するに際し、LED(原色光源)から発生した光の方向依存性が変換手段(二次光源)からの光の方向依存性と相違することである。一般的に、LEDは高い方向性の光を放出し、変換手段(本例の場合発光材料)はランバートの放射器による(拡散)光を放出する。
この本発明の第1の概念による4個の光放出ダイオードと変換手段との組合せを有する照明装置は、表IIに列記した種々の色温度に対して2個のLEDの組合せの場合よりも少なくとも10ポイント高い(Ra ≧90)演色評価数を有する。この照明装置は20lm/Wを超える視感度効率を有する。比較として、典型的な100Wの白熱電球は14lm/Wの視感度効率(色温度2800K,演色評価数100)を有し、500Wのハロゲン白熱電球は19lm/Wの視感度効率(色温度3000K,演色評価数100)を有し、これに対して36W k蛍光灯は90lm/Wの視感度効率(色温度4000K,演色評価数85)を有している。本照明装置の演色性の別の改良は、620〜670nmの波長域のスペクトル最大放出を有する深い赤のLEDを用いることにより達成される。
図3Aは本発明の第1の概念による照明装置の変形例を示す。図3Bは図3Aに示す実施例の側面の断面図である。照明装置101は、ハウジング102及びスクリーン103を具える。本例の照明装置は光が照明装置101から111方向に出射する際の開口角αを有し、この角度は調整スクリュー113,113’により変えることができる。このため、スクリーンに伸長上又は溝状の開口115,115’を有する調整プレート114,114’を設ける。図3Aに示す実施例において、開口角αは40°に等しい。この照明装置101は、多数のLED106,106’,....;107,107’,....;108,108’,....が設けるられているホルダ105を具える。LED106,106’,....;107,107’,....は、青のLED106,106’,....(スペクトラル放出430≦λ≦490nm)と赤のLED107,107’,....(スペクトラル放出590≦λ≦630nm)との交互集合を含み、これらLED106,106’,....;107,107’,....は、これらLEDから放出された光がスクリーン103に向けて入射するように位置する(光の方向は図3Aの破線の水平方向の光線により線図的に図示する)。本例では、スクリーン103の部分103’は、例えばBaSO4 のような白色顔料の層のような反射手段で覆われ又は覆われていないアルミニウムの反射器を有することができる。このスクリーン103には、LED106,106’,....;107,107’,....と対向する側に反射手段109(BaSO4 )と変換手段110との混合体を設け、この変換手段は、好ましくは青の光(400〜480nm)を緑の光(530〜565nm)に変換する性能を有する発光材料を含む。適切な発光材料の集合を表Iにリストする。LED106,106’,....;107,107’,....から放出されその後反射した光線の一部は図3Aにおいて破線により示す。図3A,3Bに示す例は、多数の別の青のLED108,108’を含み、これらのLEDは照明装置101から放出された光の方向111で極めて良好に拡散放出する。
JP2000572951A 1998-09-28 1999-09-17 照明装置 Expired - Lifetime JP4366016B2 (ja)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP98203247 1998-09-28
EP98203247.6 1998-09-28
EP99200723.7 1999-03-10
EP99200723 1999-03-10
PCT/EP1999/007015 WO2000019546A1 (en) 1998-09-28 1999-09-17 Lighting system

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JP2003529889A JP2003529889A (ja) 2003-10-07
JP2003529889A5 true JP2003529889A5 (ja) 2009-09-10
JP4366016B2 JP4366016B2 (ja) 2009-11-18

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US (1) US6234648B1 (ja)
EP (1) EP1046196B9 (ja)
JP (1) JP4366016B2 (ja)
KR (1) KR100702273B1 (ja)
CN (1) CN1227749C (ja)
DE (1) DE69937993C5 (ja)
ES (1) ES2299260T5 (ja)
WO (1) WO2000019546A1 (ja)

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