Crystal Research and Technology
Cryst. Res. Technol. 42, 1123 (2007) - Abstract -

UV-visible emission of (O2- - F+) centres in KBr

F. Zehani and M. Sebais*

Laboratoire d’étude des matériaux (LEM), Faculté des sciences, Université de Jijel, Wilaya de Jijel, Algeria
*Laboratoire de cristallographie, Université de Mentouri, Constantine, Algeria

Keywords KBr single crystals, color centres, photoluminescence
PACS 76.30.Mi
DOI 10.1002/crat.200710973

Single crystals of KBr containing the (O2- - F+) color centres and elaborated in atmospheric air by the Czochralski method are studied. The measure of the UV-visible emission spectra at 78 K present several emission bands situated between 340 and 800 nm. The photoluminescence excitation shows that these emissions are attributed to O2- and (O2- - F+) centres. This study show the new emission bands of (O2- - F+) centres which are situated in the UV-visible spectral domain. The comparison between the emission spectra before and after the thermal treatment of samples shows clearly the transformation of O2- centers at high temperature to (O2- - F+) centres.




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