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Non‐linear fluorescence quenching in molecular crystals II. Recombination of free excitons
Author(s) -
Benderskii V. A.,
Brikenshtein V. Kh.,
Burshtein A. G.,
Lavrushko A. G.,
Prikhozhenko A. G.,
Filippov P. G.
Publication year - 1979
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.2220950105
Subject(s) - anthracene , exciton , quenching (fluorescence) , quantum yield , diffusion , fluorescence , absorption (acoustics) , atmospheric temperature range , chemistry , naphthalene , analytical chemistry (journal) , range (aeronautics) , molecular physics , materials science , photochemistry , atomic physics , thermodynamics , condensed matter physics , optics , physics , organic chemistry , chromatography , composite material
The decrease of quantum yield and the fluorescence decay time of naphthalene and anthracene crystals with increasing exciton concentration (non‐linear quenching) in the range from 10 to 80 K is measured. Rate constants of bimolecular recombination, γ, found from these data with regard to diffusional escape of excitons from the light absorption layer, are increased by the factor of 1.5 to 2.0 with the increase in temperature from 10 to 30 K. In the same temperature interval the diffusion coefficient of excitons is decreased. Free‐pass model explaining an increase of γ with temperature (by the increase in the mean thermal velocity of free excitons) is suggested. From the measurements of non‐linear quenching for different light absorption coefficients of pumping the diffusion coefficients of excitons along the c′‐axis at 10 K are found to be equal to (1.3 ± 0.5) and (3 ± 1.5) × 10 −3 cm 2 s −1 in anthracene and naphthalene crystals, respectively.