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Mutual Annihilation of Triplet Excitons in 4,4′‐Dichlorobenzophenone Single Crystals at Low Temperatures
Author(s) -
Avdeenko A. A.,
Dobrovolskaya T. L.,
Kultchitskii V. A.,
Naboikin Yu. V.
Publication year - 1980
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.2220990144
Subject(s) - phosphorescence , exciton , annihilation , excited state , kinetics , atomic physics , spin (aerodynamics) , chemistry , atmospheric temperature range , materials science , molecular physics , condensed matter physics , physics , fluorescence , optics , quantum mechanics , meteorology , thermodynamics
Relative quantum yields and decay kinetics of exciton phosphorescence (O–O band at 412.46 nm) and those of X 1 ‐traps (O–O band at 413.54 nm) are measured versus the exciting light intensity in 4,4′‐dichlorobenzophenone single crystals at 1.5 and 4.2 K. The phenomena observed are treated from the point of view of mutual annihilation of triplet excitons, whose rate constant, equal to (4.2 ± 2.0) < 10 −13 cm 3 s −1 , is unchangeable in the temperature range studied. Equivalent free excitons are shown to be responsible for mutual annihilation. The decay kinetics of X 1 ‐trap phosphorescence is explained by optical spin alignment in the excited triplet state.