Luminescence of CaS:Bi

Chang Hong Kim, Chong Hong Pyun, Han Choi, Sung Jin Kim

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Luminescence of bismuth activated CaS, CaS:Bi, prepared in sodium polysulfide is studied. Excitation spectrum of CaS:Bi shows a band at 350 nm due to the recombination process between holes in Na+(Ca)2+ and electrons in conduction bands, in addition to bands at 260 nm from band gap of CaS, and at 320 nm (1S01P1) and at 420 nm (1S03P1) from electronic energy transitions of Bi. Emission band at 450 nm is from 3P11S0 transition of Bi3+, bands at 500 nm and 580 nm correspond to recombinations of electron donors (Bi3+(Ca)2+ and V(s)2-) with acceptors (V(Ca)2+ and Na+(Ca)2+). Emission band of 3P11S0 transition is shifted to longer wavelength from CaS:Bi to BaS:Bi, due to the increase of the Stokes shift by the decrease of the crystal field parameter from CaS:Bi to BaS:Bi.

Original languageEnglish
Pages (from-to)337-340
Number of pages4
JournalBulletin of the Korean Chemical Society
Issue number3
StatePublished - 20 Mar 1999


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