Abstract
Details of photoluminescence spectra of SrS singly and doubly doped with Eu2+ and Sm3+ thin films were obtained at various temperatures between 10 and 300 K. From band broadening and shifting a strong electron-lattice interaction was observed for the Eu2+ ionic transition. The temperature dependence of the emission intensity for different excitation energies in the range 2.84–5 eV leads to the identification of different transition mehanisms, namely, ionic transition and photostimulated ionization. An anomalous emission center was observed at 1.88 eV, which is proposed to be an exciton trapped at the Eu2+-VSr center.
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