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Optical Absorption on Cubic β-PbF2 Crystals |
| REN Guo-Hao;SHEN Ding-Zhong;WANG Shao-Hua;YIN Zhi-Wen |
| Shanghai Institute of Ceramics, Chinese Academy of Sciences,
Shanghai 200050 |
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| Cite this article: |
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REN Guo-Hao, SHEN Ding-Zhong, WANG Shao-Hua et al 2001 Chin. Phys. Lett. 18 976-978 |
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Abstract The transmission spectra of cubic β-PbF2 crystals grown by non-vacuum Bridgman method were measured with a spectrophotometer. It was found that there are several optical absorption bands peaking at 300 nm, 390-400 nm, as well as 460 nm. According to composition analysis, doping and annealing experiments, It is suggested that the absorption at 300 nm originate from the electron transition of Ce ions from 4f → 5d. The absorption at 390-400 nm may result from the color centers related to oxygen impurities. In addition, the sample recrystallized from the colored β-PbF2 crystal exhibits a new absorption band at 460 nm, which might be caused by trace lead vacancies.
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| Keywords:
78.40.-q
61.72.-y
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Published: 01 July 2001
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| PACS: |
78.40.-q
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(Absorption and reflection spectra: visible and ultraviolet)
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61.72.-y
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(Defects and impurities in crystals; microstructure)
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