Photostimulated luminescence and thermoluminescence of LSO scintillators

Author

Visser, R. ; Melcher, C.L. ; Schweitzer, J.S. ; Suzuki, H. ; Tombrello, T.A.

Author_Institution

Schlumberger-Doll Res., Ridgefield, CT, USA

Volume

41

Issue

4

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

689

Lastpage

693

Abstract

Photostimulated luminescence (PSL) and thermoluminescence (TL) from five Lu_2(1-x/)Cesub 2x/(SiO₄)O (LSO) crystals with different light outputs is reported. Optical irradiation into the Ce³⁺ absorption bands causes the appearance of a broad absorption band near 280 nn which is ascribed to Ce⁴⁺. In addition, a tail is observed extending beyond 700 nm. Optical irradiation into this tail (PSL) or heating of the crystal (TL) results in Ce³⁺ emission. It is shown that both PSL and TL are due to the same traps: In addition, an anti-correlation is found between the light output under gamma-ray irradiation and the trap concentration in the crystal. The nature of the recombination centers responsible for the low light output in some crystals is not clear. Annealing experiments suggest that the traps and the recombination centers may be related to oxygen vacancies

Keywords

luminescence of inorganic solids; lutetium compounds; photoluminescence; thermoluminescence; (LuCe)₂(SiO₄)O; LSO scintillators; Lu_2(1-x/)Cesub 2x/(SiO₄)O; annealing experiments; gamma-ray irradiation; photostimulated luminescence; recombination centers; thermoluminescence; trap concentration; vacancies; Absorption; Charge carrier processes; Energy exchange; Laboratories; Luminescence; Optical mixing; Photonic crystals; Radiative recombination; Stimulated emission; Tail;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.322789

Filename

322789