Title :
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
fDate :
8/1/1994 12:00:00 AM
Abstract :
Photostimulated luminescence (PSL) and thermoluminescence (TL) from five Lu2(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; Lu2(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;
Journal_Title :
Nuclear Science, IEEE Transactions on
