Abstract: A PbWO4 (PWO) single crystal has been grown by the advanced Bridgman method. The as-grown PWO crystal exhibits a weak band at 350 nm. This band was fitted into two overlapping bands peaking at 330 nm and 360 nm respectively. The absorption spectra of the as-grown crystal sample on un-polarized light and polarized light are measured respectively. The formation mechanism of colour centres in the as-grown PWO crystal is discussed and the 330 nm and 360 nm bands are ascribed to V-F and V+K centres respectively. The structure models of V-F and V+K centres are illustrated. The configuration terms, absorption transitions between the energy terms, the absorption spectral features on polarized light and the distributions of V-F and V+K centres in PWO are systematically studied.
(Effects of crystal defects, doping and substitution)
引用本文:
ZHANG Qi-Ren;LIU Ting-Yu;YAN Fei-Nan. V-F and V+K Aggregate Colour Centres: Origin of the Room-Temperature 350 nm Absorption Band in PbWO4[J]. 中国物理快报, 2004, 21(6): 1131-1134.
ZHANG Qi-Ren, LIU Ting-Yu, YAN Fei-Nan. V-F and V+K Aggregate Colour Centres: Origin of the Room-Temperature 350 nm Absorption Band in PbWO4. Chin. Phys. Lett., 2004, 21(6): 1131-1134.