Temperature dependent photoluminescence of organic semiconductors with varying backbone conformation

Details Temperature dependent photoluminescence of organic semiconductors with varying backbone conformation Temperature dependent photoluminescence of organic semiconductors with varying backbone conformation

2002-06-18

arxiv.org/abs/cond-mat/0206357v1

Physics

Condensed Matter

Materials Science

8 pages, 9 figures

Scientific paper

10.1103/PhysRevB.67.125204

We present photoluminescence studies as a function of temperature from a series of conjugated polymers and a conjugated molecule with distinctly different backbone conformations. The organic materials investigated here are: planar methylated ladder type poly para-phenylene, semi-planar polyfluorene, and non-planar para hexaphenyl. In the longer-chain polymers the photoluminescence transition energies blue shift with increasing temperatures. The conjugated molecules, on the other hand, red shift their transition energies with increasing temperatures. Empirical models that explain the temperature dependence of the band gap energies in inorganic semiconductors can be extended to explain the temperature dependence of the transition energies in conjugated molecules.

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