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Temperature Dependence of the Exciton-Exciton Annihilation Rate Constant in Poly (Di-N-Hexylsilane)

Published online by Cambridge University Press:  16 February 2011

R. G. Kepler  and
Z. G. Soos
R. G. Kepler
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
Z. G. Soos
Affiliation:
Department of Chemistry, Princeton University, Princeton, NJ 08544
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Abstract

Fluorescence depolarization studies of polysilane chains in solution have shown that energy transfer along the polymer chains occurs for only a very short time relative to the excited state lifetime and only over short distances before the excited states become trapped in long, low-energy segments. However, in solid films we have shown in previous work that excitons are highly Mobile throughout their 600 ps lifetime at room temperature, presumably because energy transfer among neighboring, parallel chain segments becomes possible. In this paper we report that the exciton-exciton annihilation rate constant decreases by only a factor of five between room temperature and 12 K, showing that the excitons do not become trapped even at low temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 328: Symposium Q – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1993 , 679
Copyright
Copyright © Materials Research Society 1994

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References

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