Thermally stimulated luminescence properties of BaY 2 F 8 :Ce Crystals |
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Authors: | A. Vedda M. Martini D. DI Martino E. Sani A. Toncelli M. Tonelli |
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Affiliation: | 1. INFM and Dipartimento di Scienza dei Materiali , Università di Milano-Bicocca , Via Cozzi 53, Milano , 20125 , Italy;2. Dip. di Fisica dell'Università di Pisa , NEST-INFM , Via Buonarroti 2, Pisa , 56127 , Italy |
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Abstract: | Wavelength resolved thermally stimulated luminescence (TSL) measurements were performed on BaY 2 F 8 :1.8 v mol% Ce crystals after X-ray irradiation at 10 v K and at 300 v K, in order to obtain preliminary information about both trap levels and recombination centres. After irradiation at 10 v K, the TSL glow curve shows the presence of a strong peak at 50 v K, together with additional structures at approximately 20 and 170 v K. The TSL spectrum is dominated by the characteristic doublet emission due to transitions from the lowest energy level of the 5d configuration to the spin-orbit split 2 F ground state of Ce 3+ . Above RT, the glow curve exhibits a peak at 60 v C, whose spectrum is again dominated by Ce 3+ emission. The TSL emission is in accordance with radio-luminescence (RL) spectra performed in the 10-300 v K region. Moreover, RL spectra at temperatures lower than 200 v K display an additional weak high energy band at around 4.5 v eV assigned to host lattice transitions. |
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Keywords: | Complex Fluorides Scintillators Cerium Doping Thermally Stimulated Luminescence Point Defects Radio-luminescence |
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