JP2014015597A - 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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- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】実施形態の蛍光体は、250〜500nmの波長範囲内に発光ピークを有する光で励起した際に、490〜580nmの波長範囲内に発光ピークを示し、下記一般式(1)で表わされる組成を有する。Cu−Kα線を用いたBragg−Brendano法によるX線回折において、2θ=30.1°〜31.1°に生ずる最大ピークの回折ピーク強度(I31)が2θ=25.0°〜26.0°に生ずる回折ピーク強度(I26)より高いことを特徴とする。
(M1-xEux)3-yAl3+zSi13-zO2+uN21-w (1)
(ここで、MはSrであり、Srの一部はBa,Ca,Mg及びNaから選ばれる少なくとも一種で置換されていてもよい。x,y,z,u及びwは、それぞれ以下を満たす。 0<x≦1; −0.1≦y≦0.3; −3≦z≦−0.52
−1.5≦u≦−0.3; −3<u−w≦1)
【選択図】なし
Description
(ここで、MはSrであり、Srの一部はBa,Ca,MgおよびNaから選ばれる少なくとも一種で置換されていてもよい。x,y,z,uおよびwは、それぞれ以下を満たす。
−1.5≦u≦−0.3; −3<u−w≦1)
(ここで、MはSrであり、Srの一部はBa,Ca,MgおよびNaから選ばれる少なくとも一種で置換されていてもよい。x,y,z,uおよびwは、それぞれ以下を満たす。
−1.5≦u≦−0.3; −3<u−w≦1)
上記一般式(1)に示されるように、発光中心元素EuはMの少なくとも一部を置換する。MはSrであり、Srの一部は、Ba、Ca、MgおよびNaから選ばれる少なくとも一種で置換されていてもよい。M全体の15at.%以下、より望ましくは10at.%以下であれば、Ba,Ca、MgおよびNaから選ばれる少なくとも一種が含有されていても、異相の生成が促進されることはない。
本実施形態にかかる蛍光体は、温度が上昇しても発光強度の低下が少ない緑色発光蛍光体である。したがって、図1に示す発光装置は、温度が上昇しても強度の高い緑色発光を発することができる。
まず、Sr原料、Eu原料、Si原料、およびAl原料として、Sr3N2、EuN、Si3N4、Al2O3およびAlNを用意し、バキュームグローブボックス中でそれぞれ秤量した。Sr3N2、EuN、Si3N4、Al2O3およびAlNの配合量は、それぞれ2.830g、0.087g、6.548g、0.340g、および0.547gとした。秤量された原料粉体は、めのう乳鉢内で乾式混合した。
Sr3N2およびEuNの配合量を、それぞれ2.837gおよび0.075gに変更し、めのう乳鉢での解砕工程をはさんだ焼成を7回に変更した以外は実施例1と同様にして実施例2の蛍光体を得た。本実施例の蛍光体の設計組成は(Sr0.985Eu0.015)3Si14Al2ON22である。
Sr3N2およびEuNの配合量を、それぞれ2.823gおよび0.100gに変更し、めのう乳鉢での解砕工程をはさんだ焼成を3回に変更した以外は実施例1と同様にして実施例3の蛍光体を得た。本実施例の蛍光体の設計組成は(Sr0.98Eu0.02)3Si14Al2ON22である。
Sr3N2、EuN、Si3N4、Al2O3およびAlNの配合量を、それぞれ2.852g、0.050g、6.782g、0.170gおよび0.478gに変更し、めのう乳鉢での解砕工程をはさんだ焼成を3回に変更した以外は実施例1と同様にして実施例4の蛍光体を得た。本実施例の蛍光体の設計組成は(Sr0.99Eu0.01)3Si14.5Al1.5O0.5N22.5である。
Sr3N2、EuN、Si3N4、Al2O3およびAlNの配合量を、それぞれ2.866g、0.025g、7.016g、0.000gおよび0.410gに変更した外は実施例1と同様にして実施例5の蛍光体を得た。本実施例の蛍光体の設計組成は(Sr0.995Eu0.005)3Si15AlN23である。
Sr3N2およびEuNの配合量を、それぞれ2.878gおよび0.005gに変更した以外は実施例5と同様にして実施例6の蛍光体を得た。本実施例の蛍光体の設計組成は(Sr0.999Eu0.001)3Si15AlN23である。
Si3N4、Al2O3およびAlNの配合量を、それぞれ6.665g、0.255gおよび0.512gに変更し、めのう乳鉢での解砕工程をはさんだ焼成を6回に変更した以外は実施例1と同様にして実施例7の蛍光体を得た。本実施例の蛍光体の設計組成は(Sr0.985Eu0.015)3Si14.25Al1.75O0.75N22.25である。
Sr3N2およびEuNの配合量を、それぞれ2.837gおよび0.075gに変更した以外は実施例7と同様にして実施例8の蛍光体を得た。本実施例の蛍光体の設計組成は(Sr0.9825Eu0.0175)3Si14.25Al1.75O0.75N22.25である。
Sr3N2およびEuNの配合量を、それぞれ2.837gおよび0.075gに変更し、めのう乳鉢での解砕工程をはさんだ焼成を7回に変更した以外は実施例4と同様にして実施例9の蛍光体を得た。本実施例の蛍光体の設計組成は(Sr0.985Eu0.015)3Si14.25Al1.75O0.5N22.5である。
Si3N4、Al2O3およびAlNの配合量を、それぞれ6.080g、0.680g、0.683gに変更した以外は実施例1と同様にして比較例1の蛍光体を得た。本比較例の蛍光体の設計組成は(Sr0.9825Eu0.0175)3Si13Al3O2N21である。
原料粉体の混合に遊星ボールミルを用いた以外は比較例1と同様にして、比較例2の蛍光体を得た。本比較例の蛍光体の設計組成は(Sr0.9825Eu0.0175)3Si13Al3O2N21である。
Sr3N2およびEuNの配合量を、それぞれ2.837gおよび0.075gに変更した以外は比較例1と同様にして比較例3の蛍光体を得た。本比較例の蛍光体の設計組成は(Sr0.985Eu0.015)3Si13Al3O2N21である。
Sr3N2、EuN、Si3N4およびAlNの配合量を、それぞれ2.878g、0.005g、6.080gおよび0.865gに変更し、めのう乳鉢での解砕工程をはさんだ焼成を3回に変更した以外は比較例1と同様にして比較例4の蛍光体を得た。本比較例の蛍光体の設計組成は(Sr0.999Eu0.001)3Si13Al3N23である。
b:Si/Al=14.25/1.75
c:Si/Al=14.5/1.5
d:Si/Al=15/1
いずれの場合においても、ピーク波長が長くなると強度維持率は低下する傾向にある。しかしながら、Si/Al比が大きくなると、強度維持率はより高い値となり、より優れた温度特性が得られることがわかる。
103…パッケージカップ; 104…反射面; 105…凹部; 106…発光素子
107…ボンディングワイヤー; 108…ボンディングワイヤー; 109…発光層
110…蛍光体; 111…樹脂層; 401…絶縁基板 402…発光素子
403…ボンディングワイヤー: 404…透明樹脂層; 405…第一の蛍光層
406…第二の蛍光層; 407…第三の蛍光層。
Claims (9)
- 250〜500nmの波長範囲内に発光ピークを有する光で励起した際に、490〜580nmの波長範囲内に発光ピークを示し、下記一般式(1)で表わされる組成を有し、Cu−Kα線を用いたBragg−Brendano法によるX線回折において、2θ=30.1°〜31.1°に生ずる最大ピークの回折ピーク強度(I31)が2θ=25.0°〜26.0°に生ずる回折ピーク強度(I26)より高いことを特徴とする蛍光体。
(M1-xEux)3-yAl3+zSi13-zO2+uN21-w (1)
(ここで、MはSrであり、Srの一部はBa,Ca,MgおよびNaから選ばれる少なくとも一種で置換されていてもよい。x,y,z,uおよびwは、それぞれ以下を満たす。
0<x≦1; −0.1≦y≦0.3; −3≦z≦−0.52
−1.5≦u≦−0.3; −3<u−w≦1) - 前記一般式(1)におけるxは、0.001≦x≦0.5であることを特徴とする請求項1に記載の蛍光体。
- 前記一般式(1)におけるyは、0≦y≦0.25であることを特徴とする請求項1に記載の蛍光体。
- 前記一般式(1)におけるzは、−2≦z≦−0.52であることを特徴とする請求項1に記載の蛍光体。
- 前記一般式(1)におけるuは、−1≦u≦−0.3であることを特徴とする請求項1に記載の蛍光体。
- 前記一般式(1)におけるu−wは、−2≦u−w≦0であることを特徴とする請求項1に記載の蛍光体。
- 前記蛍光体は、5μm以上61μm以下の粒径を有する粒子であることを特徴とする請求項1に記載の蛍光体。
- 前記蛍光体は、1以上7.5以下のアスペクト比を有する粒子であることを特徴とする請求項1に記載の蛍光体。
- 250nm〜500nmの波長範囲内に発光ピークを有する光を発する発光素子と、 前記発光素子からの光を受けて発光する蛍光体を含有する発光層とを具備し、
前記蛍光体は、請求項1に記載の蛍光体を含むことを特徴とする発光装置。
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