ANISOTROPY OF EXCITON RELAXATION IN BeO CRYSTALS

This work presents the results of experimental complex study of electronic excitation dynamics for single BeO crystals. The decay kinetics (1–500 ns) of the photoluminescence, reflectivity (8–35 eV), time-resolved emission (2.5–10.4 eV) and luminescence excitation (6–35 eV) spectra were measured at 10 K for the oriented BeO crystals. The diversity among the channels of the radiative relaxation of the electronic excitations as well as the various multiplicity of the excited states of self-trapped excitons, depending on the crystal orientation and exciting photon energy, are discussed.