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Optical Absorption and Luminescence of I‐Centers in KBr
Author(s) -
Takahashi M.,
Saidoh M.,
Itoh N.
Publication year - 1973
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.2220570233
Subject(s) - luminescence , excited state , absorption (acoustics) , atomic physics , chemistry , ion , relaxation (psychology) , absorption band , singlet state , recombination , materials science , physics , optoelectronics , optics , psychology , social psychology , organic chemistry , biochemistry , composite material , gene
Optical absorption and luminescence of interstitial ion centers, the I‐, I A (Na), and I A (Li) centers in KBr are studied. Two optical absorption bands associated with each center are identified around 230 nm and the separations of the two bands for the I‐, I A (Na), and I A (Li) centers are 0.31, 0.39, and 0.35 eV, respectively. These two bands are ascribed to the transition to the spin‐orbit doublet, E 5/2 and 6 3/2 , and the increase in the width of the lower energy band in the order of the I‐, I A (Na), and I A (Li) centers is ascribed to the removal of the degeneracy of G 3/2 in the C 3 v symmetry. On the basis of the similarity of the I‐center luminescence and recombination luminescence, it is suggested that the I‐center luminescence is essentially caused by the recombination of (Br 2 −+ e)*. The relaxation processes from the excited Br − at the interstitial site to the (Br 2 −+ e)* at either the singlet or triplet states are discussed.