Characteristics of Thermally Stimulated Luminescence and Conductivity of Insulating Crystal
A. Opanowicz
Institute of Physics, Technical University of Łodź, Wólczańska 219, 93-005 Łodź, Poland
Received: June 23, 1995; revised version: October 26, 1995; in final form: February 13, 1996
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Different characteristics of thermally stimulated luminescence and conductivity in insulator are numerically calculated without the quasi-equilibrium approximation. The results are compared with corresponding results calculated using the quasi-equilibrium approximation. This comparison suggests that the quasi-equilibrium approximation is correct in the low temperature range of the thermally stimulated luminescence and conductivity curves for crystals which have the density of recombination centres higher than 1013 cm-3 and the recombination coefficient larger than 10-12 cm3 s-1, or equivalently, for those with the initial free electron lifetime shorter than 10-1 s. For the high temperature range of the thermally stimulated luminescence and conductivity curves the quasi-equilibrium approximation gives correct results if the recombination centres density is higher than 1014 cm-3 and the recombination coefficient is larger than 10-12 cm3 s-1 or if the initial free electron lifetime is shorter than 10-2 s. The results of this paper show also that the so-called "first-order" shape of the thermally stimulated luminescence and conductivity curves is typical not of the weak retrapping only, but it can be obtained also for the strong retrapping.
DOI: 10.12693/APhysPolA.89.635
PACS numbers: 78.60.Kn, 77.22.Ej