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Issue 35, 2013
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The exciton dynamics in tetracene thin films

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Abstract

Tetracene thin films are investigated by time-resolved photoluminescence on picosecond to nanosecond time-scales. The picosecond luminescence decay dynamics is confirmed to be independent of temperature, but the nanosecond timescale luminescence dynamics is highly temperature dependent. This is interpretted in terms of motion along an intermolecular coordinate which couples the S1 state to the multiexciton (ME) state, arising from frustrated photodimerization, and giving rise to exciton dimming through adiabatic coupling. Dull excitons persist at low temperatures, but can thermally access separated triplet states at higher temperatures, quenching the delayed fluorescence. The effects of exciton density on both the picosecond and nanosecond luminescence dynamics are investigated, and a rate constant of (1.70 ± 0.08) × 10−8 cm3 s−1 is determined for singlet–singlet annihilation.

Graphical abstract: The exciton dynamics in tetracene thin films

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Publication details

The article was received on 24 Jun 2013, accepted on 18 Jul 2013 and first published on 19 Jul 2013


Article type: Paper
DOI: 10.1039/C3CP52609G
Citation: Phys. Chem. Chem. Phys., 2013,15, 14797-14805
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    The exciton dynamics in tetracene thin films

    M. J. Y. Tayebjee, R. G. C. R. Clady and T. W. Schmidt, Phys. Chem. Chem. Phys., 2013, 15, 14797
    DOI: 10.1039/C3CP52609G

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