JP4413955B2 - 蛍光体および発光装置 - Google Patents
蛍光体および発光装置 Download PDFInfo
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- JP4413955B2 JP4413955B2 JP2007188398A JP2007188398A JP4413955B2 JP 4413955 B2 JP4413955 B2 JP 4413955B2 JP 2007188398 A JP2007188398 A JP 2007188398A JP 2007188398 A JP2007188398 A JP 2007188398A JP 4413955 B2 JP4413955 B2 JP 4413955B2
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- phosphor
- light
- light emitting
- emission
- emitting device
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- C09K11/7734—Aluminates
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- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
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- C09K11/77342—Silicates
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- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/77347—Silicon Nitrides or Silicon Oxynitrides
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
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- C09K11/7738—Phosphates with alkaline earth metals
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- H01L2224/161—Disposition
- H01L2224/16135—Disposition the bump connector connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip
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Description
(Y 1-x1-y1 ,Tb x1 ,Ce y1 ) a Si b O c N d (A1)
ここで、0<x1≦0.6、0<y1≦0.2であり、a,b,c,およびdは、以下に示す範囲内である。
1.9≦a≦2.1 (3); 2.8≦b≦3.1 (4)
2.7≦c≦3.1 (5); 3.8≦d≦4.2 (6)
ここで、MはLa,Gd,およびLuからなる群から選択される少なくとも1種であり、0.01≦w2≦0.3; 0<x2≦0.6; 0<y2≦0.2であり、a,b,c,およびdは、以下に示す範囲内である。
1.9≦a≦2.1 (3); 2.8≦b≦3.1 (4)
2.7≦c≦3.1 (5); 3.8≦d≦4.2 (6)
前記発光素子上に設けられ、蛍光体を含む発光層とを具備し、
前記蛍光体の少なくとも一部は、前述の蛍光体であることを特徴とする。
a,b,cおよびdは、以下に示す範囲内であれば実質的に化学両論組成比とみなすことができるので、発光効率が大きく損なわれることはない。なお、正確な化学両論組成比は、a=2、b=3、c=3、d=4である。
2.7≦c≦3.1 (5); 3.8≦d≦4.2 (6)
本発明の一実施形態にかかる蛍光体は、イットリウムシリコン酸窒化物を結晶相とし、テルビウムおよびセリウムを付活剤として含有する。テルビウムとともにセリウムを含有するので、本発明の一実施形態にかかるイットリウムシリコン酸窒化物蛍光体は、360nm以上460nm以下の領域に発光ピークを有する光で励起した際、Tb3+の狭帯域発光スペクトルを特定の波長領域に示す。これは、本発明者らによって初めて見出された知見である。
上記一般式(A1)中、x1およびy1は、いずれも0より大きい。Tbが含有されない場合(x1=0)には、360〜460nmに発光ピークを有する光で励起したところで、得られるのはCe3+の広帯域発光のみである。Tb3+に起因する狭帯域発光は、得ることができない。一方、Ceが含有されない場合(y1=0)には、360〜460nmに発光ピークを有する光で励起した際、Tb3+に起因する540nm以上550nm以下、570nm以上590nm以下、610nm以上630nm以下の狭帯域発光が非常に小さくなってしまう。360〜460nmに発光ピークを有する光で励起した際、Tb3+に起因する狭帯域発光を得るために、TbおよびCeは、いずれも必須の付活剤として、本発明の一実施形態にかかる蛍光体に含有される。
MはLa、Gd、およびLuから選択され、w2、x2、およびy2は、いずれも0より大きい。YとM(MはLa、Gd、Luのいずれか1種類以上の元素であるとは、完全に固溶した状態で存在する。テルビウムの狭帯域発光が著しく増大することから、Mとしてはランタンが好ましい。
(Y0.875,Tb0.1,Ce0.025)2Si3O3N4蛍光体を調製した。原料粉末としては、Y2O3粉末19.2g、Si3N4粉末12.9g、Tb4O7粉末1.7gおよびCeO2粉末0.8gを用意し、ボールミルで均一に混合した。
比較例3の蛍光体は、発光強度が弱い。しかも、得られるのがCe3+の青色発光のため(Sr,Ca,Ba,Mg)5(PO4)3Cl:Eu蛍光体および赤色蛍光体(La,Y)2O2S:Eu蛍光体を混合しても、白色に調整することができなかった。
204…反射面; 205…凹部; 206…発光チップ
207…ボンディングワイヤ; 208…ボンディングワイヤ; 209…蛍光層
210…蛍光体; 211…樹脂層; 100…樹脂ステム; 101…リード
102…リード; 103…樹脂部; 104…反射面; 105…開口部
106E…ツェナー・ダイオード; 106F…半導体発光素子; 107…接着剤
109…ボンディングワイヤ; 110…蛍光体; 111…封止体
122…バッファ層; 123…n型コンタクト層; 124…活性層
125…p型クラッド層; 126…p型コンタクト層; 127…n側電極
128…p側電極; 132…n型クラッド層; 138…透光性基板
142…バンプ; 144…バンプ; 150…n型シリコン基板
152…p型領域; 154…p側電極; 156…n側電極; 158…n側電極
160…配線層; 162…高反射膜; 50、50’…リード
51…半導体発光素子; 52…マウント材; 53…ボンディングワイヤ
54…プレディップ材; 55…キャスティング材。
Claims (8)
- 下記一般式(A1)で表わされる組成を有することを特徴とするイッリウムシリコン酸窒化物蛍光体。
(Y 1-x1-y1 ,Tb x1 ,Ce y1 ) a Si b O c N d (A1)
ここで、0<x1≦0.6、0<y1≦0.2であり、a,b,c,およびdは、以下に示す範囲内である。
1.9≦a≦2.1 (3); 2.8≦b≦3.1 (4)
2.7≦c≦3.1 (5); 3.8≦d≦4.2 (6) - 上記一般式(A1)においてa=2、b=3、c=3、d=4であることを特徴とする請求項1に記載のイッリウムシリコン酸窒化物蛍光体。
- 下記一般式(A2)で表わされる組成を有することを特徴とするイッリウムシリコン酸窒化物蛍光体。
(Y 1-w2-x2-y2 ,M w2 ,Tb x2 ,Ce y2 )aSibOcNd (A2)
ここで、MはLa,Gd,およびLuからなる群から選択される少なくとも1種であり、0.01≦w2≦0.3; 0<x2≦0.6; 0<y2≦0.2であり、a,b,c,およびdは、以下に示す範囲内である。
1.9≦a≦2.1 (3); 2.8≦b≦3.1 (4)
2.7≦c≦3.1 (5); 3.8≦d≦4.2 (6) - 上記一般式(A2)においてa=2、b=3、c=3、d=4であることを特徴とする請求項3に記載のイッリウムシリコン酸窒化物蛍光体。
- M=Laであることを特徴とする請求項3または4に記載のイッリウムシリコン酸窒化物蛍光体。
- 360nm以上460nm以下の波長領域に発光ピークを有する光を発する発光素子と、
蛍光体を含む発光層とを具備し、
前記蛍光体の少なくとも一部は、請求項1乃至5のいずれか1項に記載の蛍光体であることを特徴とする発光装置。 - 前記発光層は、580nm以上680nm以下の領域に主発光ピークを有する第2の蛍光体を含むことを特徴とする請求項6に記載の発光装置。
- 前記発光層は、430nm以上510nm以下の領域に主発光ピークを有する第3の蛍光体を含むことを特徴とする請求項6または7に記載の発光装置。
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US12/021,759 US8043528B2 (en) | 2007-07-19 | 2008-01-29 | Luminescent material |
EP08004973A EP2017322A1 (en) | 2007-07-19 | 2008-03-17 | Luminescent material |
CN2008101358920A CN101348715B (zh) | 2007-07-19 | 2008-07-21 | 荧光体和发光装置 |
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US20100247893A1 (en) * | 2009-03-25 | 2010-09-30 | Goldeneye, Inc. | High quality luminescent materials for solid state lighting applications |
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WO2015045260A1 (ja) | 2013-09-30 | 2015-04-02 | パナソニックIpマネジメント株式会社 | 蛍光体及びこれを用いた発光装置、照明光源、照明装置 |
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