Very strong sharp lines in luminescence of Tm 3+ have been observed in Li-codoped ZnS:Tm phosphor. In particular, blue emission intensity was stronger as compared with that of infrared emission when the codoped Li concentration in ZnS:Tm was 0.1 at.%. As ZnS:Tm emits a broad band and very weak Tm 3+ lines, the role of Li is proposed as follows: Li ions fill defects in the ZnS host, and hence excitation energy transfers from the ZnS host to Tm 3+ very easily.
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Hatayama et al. (1992) studied this question.
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