Peculiarities of core–valence luminescence of CsBr and Rb 1− x Cs x Br crystals

• Published in: physica status solidi (b) 2004-09, Vol.241 (11), p.2613-2619
• Main Authors: Voloshinovskii, A., Pashuk, I., Chornodol'skyi, Ya, Stryganyuk, G., Rodnyi, P.
• Format: Article
• Language: English
• ISSN: 0370-1972; 1521-3951
• DOI: 10.1002/pssb.200302051

The study of the emission and excitation spectra as well as the decay kinetics for the intrinsic core–valence luminescence of CsBr and the impurity core–valence luminescence of Rb 1− x Cs x Br solid solution under excitation in the 10–20 eV energy range has been carried out in the temperature range of 10–300 K. The change of coordination number for the Cs + ion from n = 8 to n = 6 at the transformation of CsBr to Rb 0.9 Cs 0.1 Br solid solution is accompanied by significant modification of the core–valence luminescence spectra shape. The temperature dependence of the excitation efficiency in the threshold region observed for Rb 0.9 Cs 0.1 Br could be caused by the decay of the 5d 3/2 excited state of the Cs + ion due to thermostimulated electron transition from this state into the conduction band, which leads to the appearance of unbounded 5p Cs + core holes. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)