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Thermoluminescence and Optical Absorption Studies of Z 1 Centers in KCI Crystals Doped with Praseodymium
Author(s) -
Balraj K.,
Veeresham P.
Publication year - 1992
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170270622
Subject(s) - thermoluminescence , praseodymium , doping , absorption (acoustics) , wavelength , analytical chemistry (journal) , luminescence , materials science , chemistry , optoelectronics , inorganic chemistry , chromatography , composite material
Thermoluminescence (TL) of Pr‐doped KCI is studied. The influence of pre‐heat treatment and optical bleaching of the glow curves and the production of Z 1 centers are discussed. The glow curves of KCI containing 1062 ppm of praseodymium (Pr) shows one shoulder at 365 K (T 1 ) and two peaks around 408 K (T 2 ) and 443 K (T 3 ), respectively. Bleaching of X‐irradiated crystals shows that the peak T 2 is enhanced whereas other two (T 1 , T 3 ) get suppressed. Optical absorption studies of the crystals before and after F‐bleaching shows that the F‐band decreases and shifts towards longer wavelengths. The decrease is accompanied by broadening towards the longer wavelength. The T 2 peak is attributed to Z 1 centres. It is shown that T 1 corresponds to shallow centers and T 3 peak is attributed to F‐centers.