Abstract
Abstract— Ce emission in SrS thin films has been investigated in the temperature range of 6–300 K. Films codoped with Cl show a strong thermal quenching around 50 K with a thermal activation energy of 0.3–0.4 eV. The low activation energy indicates the presence of shallow quenching centers. These centers are probably created out of various possible complex centers formed due to pairing of strontium and sulfur vacancies with co‐activators and are associated with Ce emission centers. Ce in the presence of Cl has a greater tendency of forming Sr vacancies as compared to that in the presence of excess S. Zn codoping along with K has been found to reduce these vacancies and significantly improve the thermal stability of the luminescent characteristics of SrS:Ce thin films.
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