Characteristics of thermally stimulated luminescence and conductivity of insulating crystal

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 10(13) cm(-3) and the recombination coefficient larger than 10(-12) cm(3) 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 10(14) cm(-3) and the recombination coefficient is larger than 10(-12) cm(3) 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.