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V-F and V+K Aggregate Colour Centres: Origin of the Room-Temperature 350 nm Absorption Band in PbWO4 |
| ZHANG Qi-Ren;LIU Ting-Yu;YAN Fei-Nan |
| College of Science, University of Shanghai for Science and Technology, Shanghai 200093 |
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| Cite this article: |
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ZHANG Qi-Ren, LIU Ting-Yu, YAN Fei-Nan 2004 Chin. Phys. Lett. 21 1131-1134 |
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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.
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| Keywords:
76.30.Mi
74.62.Dh
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Published: 01 June 2004
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| PACS: |
76.30.Mi
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(Color centers and other defects)
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74.62.Dh
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(Effects of crystal defects, doping and substitution)
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