The effects of Li codoping in ZnS:TmF3 thin-film electroluminescent devices are reported. ZnS:Tm, Li thin films are prepared at several Li concentrations and substrate temperatures. The electroluminescent characteristics of ZnS:Tm,Li devices depend on Li concentrations, substrate temperatures, the annealing, and drive voltages.
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Sohn et al. (1993) studied this question.
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