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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 2
BKCSDE 30(2)
February 20, 2009 

Synthesis and Luminescence Properties of CaS:Eu2+,Si4+,Ga3+ for a White LED
Sung Il Oh, Yong Kwang Jeong, Jun Gill Kang*
CaS:Eu2+ phosphor, Incorporation of Si4+ and Ga3+, Luminescence, LED
The luminescence intensity of calcium sulfide codoped with Eu2+, Si4+ and Ga3+ was investigated as a function of the dopant concentration. An enhancement of the red luminescence resulted from the incorporation of Si4+ and Ga3+ into CaS:Eu2+. The non-codoped CaS:Eu2+ converted only 3.0% of the absorbed blue light into luminescence. As the Si4+ and Ga3+ 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:Eu2+,Si4+,Ga3+ 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.
419 - 422
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