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

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概要

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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 543 nm under 450 nm 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.

• 2012-02-25

著者

• Lee Kyoung

  School Of Civil And Environmental Engineering Yonsei University

• JANG Ho

  Department of Chemistry and Molecular Engineering, Korea University

• Boo Hye

  Research Institute, Force4 Corporation, Gwangju 500-470, Republic of Korea

• Yoon Ho

  Research Institute, Force4 Corporation, Gwangju 500-470, Republic of Korea

• Park Seung

  Research Institute, Force4 Corporation, Gwangju 500-470, Republic of Korea

• Im Won

  School of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea

• Lee Kyoung

  School of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea

• Jang Ho

  Department of Chemistry, Korea University, Seoul 136-706, Republic of Korea

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