Excitation of triplet excitons in aromatic single crystals by guest-host energy 
transfer

Zimmermann, Herbert; Stehlik, D.; Hausser, Karl H.

doi:10.1016/0009-2614(71)80393-7

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Excitation of triplet excitons in aromatic single crystals by guest-host energy transfer

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Zimmermann, Herbert
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Stehlik, D.
Max Planck Institute for Medical Research, Max Planck Society;

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Hausser, Karl H.
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Zimmermann, H., Stehlik, D., & Hausser, K. H. (1971). Excitation of triplet excitons in aromatic single crystals by guest-host energy transfer. Chemical Physics Letters, 11(4), 496-500. doi:10.1016/0009-2614(71)80393-7.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-8325-1

Abstract

Selective excitation of singlet states of one guest molecule (phenazine or acridine as donor) in a host single crystal (fluorene or diphenyl) populates the lowest triplet state of a second guest molecule (naphthalene-d8 or pyrene-d10 as acceptor). Phosphorescence as well as ESR were used to detect the population of the triplet states of the acceptor. The results can be interpreted only as energy transfer from the donor singlet to the acceptor triplet state either via intermolecular intersystem crossing from a donor singlet state to the lowest triplet state of the host or via intramolecular intersystem crossing and triplet-triplet energy transfer to the host from a higher triplet state or from a highly excited vibrational level of the triplet ground state of the donor, followed both by triplet exciton diffusion and exciton-trapping in the acceptor triplet state. High quantum yields up to 5% can be estimated for the observed energy transfer process.