A thermally stimulated luminescence (TSL) study in the temperature range 20-300 degrees C has been performed after x-ray irradiation on mixed LuxY1-xAlO3:Ce crystals (x=0.1-0.3) and on YAlO3:Ce. Several glow peaks have been detected, namely at 50 degrees C, 100-130 degrees C (composite structure), 175 degrees C and 225 degrees C, whose intensities are dependent upon the crystal composition. The spectrum of the emitted light features one band at 3.45 eV due to the 5d-->4f transition of the Ce3+ ion, in good agreement with the UV excited emission spectrum. A detailed analysis of the trap depths of the peaks has been performed in the case of Lu0.2Y0.8AlO3:Ce by partial cleaning of the glow curve. A constant energy value of approximately 1.15 eV has been found for all TSL peaks. From this result, and from the lack of a thermally stimulated current signal in the whole temperature range, it is possible to propose that TSL recombination is governed by a thermally assisted tunneling process from one trap level found at different distances from cerium emitting centers. A strong increase of TSL intensity has been observed after a prolonged annealing treatment in a vacuum atmosphere, suggesting that the electron traps are probably related to oxygen vacancies. Under this hypothesis, the relation between the frequency factors of the TSL peaks and the shortest O-Ce distances in the lattice has been investigated: an exponential dependence has been found, in accordance with what is expected for the thermally assisted tunneling recombination process.

Vedda, A., Martini, M., Meinardi, F., Chval, J., Dusek, M., Mares, J., et al. (2000). Tunneling process in thermally stimulated luminescence of mixed LuxY1-xAlO3 : Ce crystals. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 61(12), 8081-8086 [10.1103/PhysRevB.61.8081].

Tunneling process in thermally stimulated luminescence of mixed LuxY1-xAlO3 : Ce crystals

VEDDA, ANNA GRAZIELLA;MARTINI, MARCO;MEINARDI, FRANCESCO;
2000

Abstract

A thermally stimulated luminescence (TSL) study in the temperature range 20-300 degrees C has been performed after x-ray irradiation on mixed LuxY1-xAlO3:Ce crystals (x=0.1-0.3) and on YAlO3:Ce. Several glow peaks have been detected, namely at 50 degrees C, 100-130 degrees C (composite structure), 175 degrees C and 225 degrees C, whose intensities are dependent upon the crystal composition. The spectrum of the emitted light features one band at 3.45 eV due to the 5d-->4f transition of the Ce3+ ion, in good agreement with the UV excited emission spectrum. A detailed analysis of the trap depths of the peaks has been performed in the case of Lu0.2Y0.8AlO3:Ce by partial cleaning of the glow curve. A constant energy value of approximately 1.15 eV has been found for all TSL peaks. From this result, and from the lack of a thermally stimulated current signal in the whole temperature range, it is possible to propose that TSL recombination is governed by a thermally assisted tunneling process from one trap level found at different distances from cerium emitting centers. A strong increase of TSL intensity has been observed after a prolonged annealing treatment in a vacuum atmosphere, suggesting that the electron traps are probably related to oxygen vacancies. Under this hypothesis, the relation between the frequency factors of the TSL peaks and the shortest O-Ce distances in the lattice has been investigated: an exponential dependence has been found, in accordance with what is expected for the thermally assisted tunneling recombination process.
Articolo in rivista - Articolo scientifico
Photoluminescence, radioluminescence, thermoluminescence
English
15-mar-2000
61
12
8081
8086
none
Vedda, A., Martini, M., Meinardi, F., Chval, J., Dusek, M., Mares, J., et al. (2000). Tunneling process in thermally stimulated luminescence of mixed LuxY1-xAlO3 : Ce crystals. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 61(12), 8081-8086 [10.1103/PhysRevB.61.8081].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/9277
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