Molecular size and luminescence decay influenced by energy transfer by the exchange mechanism

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Abstract
The decay law has been investigated theoretically when electronic excitation energy transfer is efficient. The concept of a nonvanishing closest donor–acceptor distance has been introduced into the theory of Inokuti and Hirayama for energy transfer by exchange interaction. A previous report of Hara and Gondo on the same subject based on Inokuti–Hirayama’s theory has been examined and some mistakes have been found in the theory and experiment. Careful treatment of equations yields a decay law different from that of Hara and Gondo. The inclusion of the closest donor–acceptor distance modifies the decay form significantly.