The near-IR luminescence of preliminarily undeformed SrS phosphors is investigated. It is shown that it belongs to the luminescence of $F^+$ centers and near-anionic vacancies. The ignition and extinction times of this luminescence are measured. The dependence of the change in luminescence intensity of $F^+$ centers and near-anionic vacancies under the action of the exciting light is established, and an explanation for the interrelationship between these centers is offered.
Department of Quantum Theory, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119991, Russia
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