Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Preparation, Characterization and Photoluminescence Properties of Ca1-xSrxS:Eu Red-emitting Phosphors for a White LED

  • Sung, Hye-Jin (Department of Chemistry, Institute of Nanosensor and Biotechnology, Dankook University) ;
  • Cho, Young-Sik (Department of Chemistry, Institute of Nanosensor and Biotechnology, Dankook University) ;
  • Huh, Young-Duk (Department of Chemistry, Institute of Nanosensor and Biotechnology, Dankook University) ;
  • Do, Young-Rag (Department of Chemistry, Kookmin University)
  • Published : 2007.08.20
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Abstract

A series of Ca1-xSrxS:Eu (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) phosphors were synthesized by solid-state reactions. The Ca1-xSrxS:Eu phosphors have a strong absorption at 455 nm, which corresponds to the emission wavelength of a blue LED. The emission peak of Ca1-xSrxS:Eu is blue shifted from 655 to 618 nm with increasing Sr content. The characteristics of Ca1-xSrxS:Eu phosphors make them suitable for use as wavelengthtunable red-emitting phosphors for three-band white LEDs pumped by a blue LED. In support of this, we fabricated a three-band white LED by coating SrGa2S4:Eu and Ca0.6Sr0.4S:Eu phosphors onto a blue LED chip, and characterized its optical properties.

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