Creation and optical properties of stable and metastable hole-trapped centres in beryllium oxide

Abstract The paper is devoted to study of formation mechanisms and optical absorption of the hole-trapped centers in neutron, electron-impulse and X-irradiated BeO crystals. V0 and V− centers are found out to be formed as a result of neutron irradiation creating cation Frenkel pairs. Within the transient absorption decay kinetics, we registered a component whose thermal-time properties coincide with those of the luminescence of triplet self-trapped excitons. A number of absorption bands from the VB center and exciton hole nucleus are interpreted as transitions between the O− ion p-levels splitted by the crystal field, as well as polaron transitions and transitions into the valence band.

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