Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Luminescence Properties of CaS:Eu2+,Si4+,Ga3+ for a White LED

  • Oh, Sung-Il (Department of Chemistry, Chungnam National University) ;
  • Jeong, Yong-Kwang (Department of Chemistry, Chungnam National University) ;
  • Kang, Jun-Gill (Department of Chemistry, Chungnam National University)
  • Published : 2009.02.20
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Abstract

The luminescence intensity of calcium sulfide codoped with $Eu^{2+},\;Si^{4+}\;and\;Ga^{3+}$ was investigated as a function of the dopant concentration. An enhancement of the red luminescence resulted from the incorporation of $Si^{4+}\;and\;Ga^{3+}\;into\;CaS:Eu^{2+}.\;The\;non-codoped\;CaS:Eu^{2+}$ converted only 3.0% of the absorbed blue light into luminescence. As the $Si^{4+}\;and\;Ga^{3+}$ were embedded into the host lattice, the luminescence intensity increased and reached a maximum of Q = 10.0% at optimized concentrations of the codopants in CaS. Optimized CaS:$Eu^{2+},Si^{4+},Ga^{3+}$ phosphors were fabricated with blue GaN LED and the chromaticity index of the phosphor-formulated GaN LED was investigated as a function of the wt% of the optimized phosphor.

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