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Theory of Energy Migration in Doped Molecular Crystals
Author(s) -
Golubov S. I.,
Konobeev Yu. V.
Publication year - 1975
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.2220700140
Subject(s) - luminescence , acceptor , doping , excitation , dipole , crystal (programming language) , molecule , diffusion , radius , chemistry , förster resonance energy transfer , atomic physics , impurity , physics , condensed matter physics , fluorescence , thermodynamics , optics , quantum mechanics , computer security , computer science , programming language , organic chemistry
Abstract The kinetics of diffusion‐controlled sensitized luminescence is analyzed in molecular crystals in which a small concentration of acceptor molecules is embedded. It is shown that if the probability of the excitation energy transfer is determined by the dipole‐dipole interaction between donor and acceptor molecules the host luminescence decay law n ( t ) changes from Förster's law ( n ( t ) ∼ exp (−α \documentclass{article}\pagestyle{empty}\begin{document}$ \sqrt t $\end{document} ))to an exponential one ( n ( t ) ∼ exp (−β t )) with the electronic excitation diffusion length increasing from 0 to l ≧ 5 R 0 , where R 0 , is the effective radius of the energy transfer by resonance. In addition the host luminescence decay law n ( t ) is found with account for the electronic excitation migration over donor molecules in molecular crystal doped by donor and acceptor impurities of small concentrations. It is shown that for such a system the function n ( t ) cannot be derived from any appropriate diffusion equation.