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⁺-V_Sr center.

© 1993 Optical Society of America

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