CHARACTERISTICS OF THERMALLY STIMULATED LUMINESCENCE AND CONDUCTIVITYOF INSULATING CRYSTAL

Different characteristics of thermally stimulated luminescence and con ductivity in insulator are numerically calculated without the quasi-eq uilibrium approximation. The results are compared with corresponding r esults calculated using the quasi-equilibrium approximation. This comp arison suggests that tile quasi-equilibrium approximation is correct i n the low temperature range of the thermally stimulated luminescence a nd conductivity curves for crystals which have the density of recombin ation centres higher than 10(13) cm(-3) and the recombination coeffici ent larger than 10(-12) cm(3) s(-1) or equivalently, for those with th e initial free electron lifetime shorter than 10(-1) s. For the high t emperature range of the thermally stimulated luminescence and conducti vity curves tile 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 i f the initial free electron lifetime is shorter than 10(-2) s. The res ults of this paper show also that the so-called ''first-order'' shape of the thermally stimulated luminescence and conductivity curves is ty pical not of the weak retrapping only, but it can be obtained also for the strong retrapping.