Mixed Crystals
نویسنده
چکیده
Optical absorption spectra of KBr:Tl + (0.01mol%) single crystals shows A, B and C bands around 258, 220 and 210nm respectively. An additional absorption bands are observed in KBr-KI: Eu 2+ , Tl + (0.05, 0.01mol %) mixed crystals. These additional absorption spectra are attributed to the presence of Eu 2+ aggregates and complex centers involving both Eu 2+ and Tl + ions. Inclusion of Tl + ions in KBr-KI: Eu 2+ crystal is found to enhance the intensity of Eu 2+ absorption band due to an energy transfer from Tl + Eu 2+ ions.
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