Relaxation of electron excitations in beryllium oxide. Auto localized excitons

Combined luminescent-optical investigations within 80-600 K temperature range and 5-36 eV energy range is conducted for BeO nominally pure crystals. Analysis of selective excitation spectra of luminescence, kinetic parameters and temperature dependences of the selected luminosity, as well as, of spectra of transit optical absorption induced by electron beam, is presented. Models of auto localized excitons differing in configuration of hole component are suggested and fact of coexistence of high and low radii excitons is determined on the basis of the analysis with regard to peculiarities of BeO crystalline structure. 40 refs.; 8 figs