Thermostimulated processes in statically and dynamically disordered luminescent solids

Trap spectra depending on the concentration of defects in crystalline KBr-T1, LiF-Mg,Ti, Al2O3 and glassy Na2O·SiO2 are investigated. The nature of inhomogeneous broadening and continuous distribution of traps over activation energies at sufficiently high defect concentrations is considered. Impurity hopping controlled recombination of electronic excitations is observed. The presence of enlarged values of process activation energies and frequency factors is discussed in terms of the concept of dynamic disorder, taking into account the fluctuational changes in both the perfect part and the structure of defects in the solid at high temperatures. (Author)