Radiation and thermally induced effects in YAlO3:Mn crystals
2004; Elsevier BV; Volume: 109; Issue: 1 Linguagem: Inglês
10.1016/j.jlumin.2004.01.018
ISSN1872-7883
AutoresYa. Zhydachevskii, Andriy Durygin, A. Suchocki, A. Matkovskii, D. Sugak, G. B. Loutts, M. A. Noginov,
Tópico(s)Photorefractive and Nonlinear Optics
ResumoWe have studied effects induced by γ-radiation and temperature in Mn-doped YAlO3 crystals. The studies have been performed by means of optical spectroscopy that include measuring of optical absorption changes induced by γ-radiation and elevated temperature as well as thermally stimulated luminescence (TSL). It has been shown that under γ-irradiation of YAlO3:Mn crystals, along with the ionization of MnAl4+ ions (MnAl4+→MnAl5++e−), some additional coloration processes take place. This additional coloration is characterized by a wide intense band centered at 26,000–25,000cm−1 that is ascribed to color centers intrinsic to YAlO3 lattice. This coloration is removed by the way of crystal warming at T⩾350K, while the coloration caused by MnAl5+ ions is removed at higher temperature (T⩾500K). The observed TSL glow of irradiated crystals reveals three peaks near 360, 400 and 500K that correspond to three types of traps. Parameters of the traps have been determined. The TSL emission corresponds to intra-center luminescence of MnAl4+ and MnY2+ ions. The possible ionization and trapping mechanisms in YAlO3:Mn crystals are discussed.
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