Abstract
AbstractOptical anisotropy of absorption and luminescence of F‐centres in BeO crystals are investigated. It is established that the anisotropy of the absorption band of F‐centres in the 6.5 eV region is due to the splitting of the singlet excited state of the 1P type into the components 1A1 and 1E in the crystalline field of C3v symmetry. It is shown that the anisotropic band of F‐centre luminescence at 4.9 eV is determined by singlet‐singlet transitions 1A1 → 1A1. The more intense luminescence band of F‐centres at 3.4 eV with the lifetime 700 ms at 80 K and the insignificant anisotropy are due to the spin forbidden triplet‐singlet transitions 3E → 1A1. The characteristics of non‐radiative transitions in the F‐centre and the reasons for the absence of photoconversion of F → F+ centres are discussed.
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