Abstract
CsBr:Eu crystals with aggregate centers have been characterized by photoluminescence measured at the temperature range 10–550 K and thermostimulated luminescence. The aggregates have been created by annealing of the CsBr with 0.42 mol% of metallic Eu in air at temperature 430–520 K. It has been shown that crystals contain nanocrystals and precipitates of the Eu 2+ compounds probably of the phases of CsEuBr 3, Cs 4EuBr 6 and EuBr 2, that emit with the bands peaked at 516, 490 and 409 nm, respectively, and the isolated dipole centers of Eu 2+–V Cs that emit with the band peaked at 431 nm. The excitation energy transfer between isolated dipole centers Eu 2+–V Cs and aggregate centers and influence of the F-like centers on this process have been analyzed. It has been shown that deexcitation of Eu 2+ ions takes place mainly through luminescence of aggregate centers.
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