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Triplet exciton trapping in p‐terphenyl crystals studied by delayed fluorescence and phosphorescence
Author(s) -
Takase T.,
Morikawa E.,
Kotani M.
Publication year - 1983
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.2221150134
Subject(s) - phosphorescence , annihilation , exciton , fluorescence , terphenyl , trapping , photochemistry , chemistry , materials science , atomic physics , molecular physics , physics , optics , condensed matter physics , nuclear physics , ecology , organic chemistry , biology
Triplet exciton trapping in p‐terphenyl crystals is investigated by delayed fluorescence and phosphorescence. Trap depth ((2800 ± 100) cm −1 ) and concentration (10 −6 mol/mol) are deduced from the temporal behaviour of delayed fluorescence. The same trap is also found in the phosphorescence spectrum. The bimolecular annihilation rate constant between free and trapped excitons (1 × 10 −13 cm 3 s −1 ) is found to be orders of magnitude smaller than that for free—free annihilation.