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Optical Properties of the F‐Centre in Beryllium Oxide
Author(s) -
Gorbunov S. V.,
Kruzhalov A. V.,
Springis M. J.
Publication year - 1987
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221410129
Subject(s) - luminescence , anisotropy , excited state , singlet state , absorption (acoustics) , beryllium oxide , atomic physics , materials science , beryllium , chemistry , condensed matter physics , physics , optics , optoelectronics , organic chemistry , composite material
Optical 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 1 P type into the components 1 A 1 and 1 E in the crystalline field of C 3v symmetry. It is shown that the anisotropic band of F‐centre luminescence at 4.9 eV is determined by singlet‐singlet transitions 1 A 1 → 1 A 1 . 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 3 E → 1 A 1 . The characteristics of non‐radiative transitions in the F‐centre and the reasons for the absence of photoconversion of F → F + centres are discussed.