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Photoluminescence (PL) spectra (excitation by UV (320 nm) at R.T. of BaS phosphors, activated by rare earth (RE) impurities like Ce and Sm, are presented in this paper. The emission bands, in general, are broad in nature. While characteristic Ce emission bands around 2.40 and 2.08 eV are observed in the case of BaS:Ce phosphors, BaS:Sm and BaS:Ce, Sm Phosphors have exhibited entirely different features in the luminescence spectra. The results are discussed considering the role of impurities, flux and native defects of this system of phosphors.
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Ajay et al. (1984) studied this question.
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