Apparent vibrational side-bands in pi-conjugated systems: the case of distyrylbenzene

Details Apparent vibrational side-bands in pi-conjugated systems: the case of distyrylbenzene Apparent vibrational side-bands in pi-conjugated systems: the case of distyrylbenzene

2005-12-03

arxiv.org/abs/cond-mat/0512067v1

Phy. Rev. B71 081201 (2005)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.71.081201

The photoluminescence (PL) spectra of dilute solution and single crystals of distyrylbenzene show unique temperature dependent vibronic structures. The characteristic single frequency progression at high temperatures is modulated by a low frequency progression series at low temperatures. None of the series side band modes corresponds to any of the distyrylbenzene Raman frequencies. We explain these PL properties using a time dependent model with temperature dependent damping, in which the many-mode system is effectively transformed to two- and then to a single "apparent" mode as damping increases.

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