Creation and optical properties of stable and metastable hole-trapped centres in beryllium oxide |
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| Authors: | S V Gorbunov V J Ivanov I N Antsigin A V Kruzhalov B V Shulgin |
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| Institution: | Ural Politechnical Institute , Sverdlovsk, USSR |
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| Abstract: | 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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