Thermally stimulated luminescence properties of BaY2F 8:Ce crystals

Year: 2002

Authors: Vedda A., Martini M., Di Martino D., Sani E., Toncelli A., Tonelli M.

Autors Affiliation: INFM, Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via Cozzi 53, 20125 Milano, Italy; NEST-INFM, Dip. di Fisica, Università di Pisa, Via Buonarroti 2, 56127 Pisa, Italy

Abstract: Wavelength resolved thermally stimulated luminescence (TSL) measurements were performed on BaY2F8:1.8 mol% Ce crystals after X-ray irradiation at 10 K and at 300 K, in order to obtain preliminary information about both trap levels and recombination centres. After irradiation at 10 K, the TSL glow curve shows the presence of a strong peak at 50 K, together with additional structures at approximately 20 and 170 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 spinorbit split 2F ground state of Ce3+. Above RT, the glow curve exhibits a peak at 60°C, whose spectrum is again dominated by Ce3+ emission. The TSL emission is in accordance with radio-luminescence (RL) spectra performed in the 10-300 K region. Moreover, RL spectra at temperatures lower than 200 K display an additional weak high energy band at around 4.5 eV assigned to host lattice transitions.


Volume: 157 (6-12)      Pages from: 973  to: 976

KeyWords: Barium compounds; Ground state; Phosphors; Point defects; Thermoluminescence; X ray analysis, Cerium doping; Complex fluorides; Radio-luminescence; Thermally stimulated luminescence, Single crystals
DOI: 10.1080/10420150215774

Citations: 2
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