Optical properties of BaY2F8:Ce3+

Year: 2005

Authors: Fabeni P., Di Martino D., Nikl M., Pazzi G. B., Sani E., Toncelli A., Tonelli M., Vedda A.

Autors Affiliation: IFAC (ex IROE)-CNR, Via Panciatichi 64, Florence, Italy;
INFM-CNR and Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via Cozzi 53,20125 Milano, Italy;
Institute of Physics AS CR, Cukrovarnicka 10, 162 53 Prague, Czech Republic;
NEST-INFM, Dip. di Fisica dell’Università di Pisa, Via Buonarroti 2, 56127 Pisa, Italy

Abstract: The optical properties of Ce3+-doped BaY2F8 crystals were investigated under selective laser excitation and X-ray irradiation. In both cases, the emission spectrum is dominated by the characteristic doublet transition from the lowest energy level of the 5d configuration to the spin-orbit split 2F ground state of Ce3+. Excitation bands at 4.1, 5.0, 5.9 and 6.2 eV, due to transitions between 4f and split 5d levels were observed. The emission time decay was satisfactorily analyzed by a single exponential component, characterized by
a decay time of approximately 28 ns at 10 K and slightly increasing with temperature. A monotonic temperature quenching of the photo-luminescence intensity was observed; on the other hand, the temperature dependence of radio-luminescence intensity is modulated by the presence of shallow traps competing with Ce3+ ions in carrier trapping during irradiation.

Journal/Review:

Volume: 2 (1)      Pages from: 244  to: 247

KeyWords: Cerium; Doping (additives); Electronic structure; Irradiation; Lasers; Luminescence, Lowest energy level; Selective laser excitation; X-ray irradiation, Optical properties

Citations: 2
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