Efficiency and thermal stability enhancements of Sr 2SiO 4:Eu 2+ phosphor via Bi 3+ codoping for solid-state white lighting

Seung Hyok Park, Ho Shin Yoon, Hye Min Boo, Ho Gyeom Jang, Kyoung Hwa Lee, Won Bin Im

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13 Citations (Scopus)

Abstract

Bi and Eu-codoped yellow-emitting phosphors of composition Sr 1.95-xEu 0.05Bi xSiO 4 were prepared, and their emission and thermal quenching characteristics were investigated. The initial PL intensity and thermal quenching behaviors of Sr 1.95-xEu 0.05Bi xSiO 4 were affected by the Bicodoping as a coactivator. When 0.01 mol% of Bi was codoped to Sr 1.95-xEu 0.05Bi xSiO 4, it showed an intense emission peak at 543nm under 450nm excitation. The peak intensity corresponds to a relative intensity of 112% of a commercial Sr 2SiO 4:Eu 2+ phosphor (Force4 Corp.), which may be attributed to energy transfer between Bi 3+ and Eu 2+. The results suggest that phosphors deriving from Sr 1.95-xEu 0.05Bi xSiO 4 will be a breakthrough for white light emitting diode (LEDs) and related applications in terms of efficiency enhancement and thermal stability.

Original languageEnglish
Article number022602
JournalJapanese journal of applied physics
Volume51
Issue number2 PART 1
DOIs
Publication statusPublished - 2012 Feb

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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