Efficiency and Thermal Stability Enhancements of Sr2SiO4:Eu2+ Phosphor   via Bi3+ Codoping for Solid-State White Lighting

Park Seung Hyok; Yoon Ho Shin; Boo Hye MinJang Ho GyeomLee Kyoung HwaIm Won Bin

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Efficiency and Thermal Stability Enhancements of Sr2SiO4:Eu2+ Phosphor via Bi3+ Codoping for Solid-State White Lighting

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Bi and Eu-codoped yellow-emitting phosphors of composition Sr1.95-xEu0.05BixSiO4 were prepared, and their emission and thermal quenching characteristics were investigated. The initial PL intensity and thermal quenching behaviors of Sr1.95-xEu0.05BixSiO4 were affected by the Bi-codoping as a coactivator. When 0.01 mol of Bi was codoped to Sr1.95-xEu0.05BixSiO4, it showed an intense emission peak at 543nm under 450nm excitation. The peak intensity corresponds to a relative intensity of 112 of a commercial Sr2SiO4:Eu2+ phosphor (Force4 Corp.), which may be attributed to energy transfer between Bi3+ and Eu2+. The results suggest that phosphors deriving from Sr1.95-xEu0.05BixSiO4 will be a breakthrough for white light emitting diode (LEDs) and related applications in terms of efficiency enhancement and thermal stability. (C) 2012 The Japan Society of Applied Physics

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《Japanese journal of applied physics》 |2012年第2issue1期|22602.1-22602.5|共5页
作者
Park Seung Hyok; Yoon Ho Shin; Boo Hye MinJang Ho GyeomLee Kyoung HwaIm Won Bin;
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作者单位

Korea Univ, Dept Chem, Seoul 136706, South Korea.;

Force4 Corp, Res Inst, Kwangju 500470, South Korea.;

Chonnam Natl Univ, Sch Mat Sci & Engn, Kwangju 500757, South Korea.;

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正文语种英语
中图分类应用物理学;
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Efficiency and Thermal Stability Enhancements of Sr2SiO4:Eu2+ Phosphor via Bi3+ Codoping for Solid-State White Lighting

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