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Solvatochromic Effects on the Photoinduced Charge-Transfer States in Donor–Acceptor Substituted Polydioctylfluorenes

✍ Scribed by Dr. Caryl E. Richards; Prof. Richard T. Phillips

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
260 KB
Volume
12
Category
Article
ISSN
1439-4235

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✦ Synopsis

Abstract

Polymer morphology affects quantum efficiency. The influence of polymer morphology on the emission from charge transfer states within donor–acceptor (D–A) polydioctylfluorene derivatives is investigated. Two D–A copolymers, comprising one‐ and two‐electron‐donating triphenylamines substituted into the electron‐accepting dioctylfluorene repeat unit were studied. Time‐resolved emission spectra (with a resolution of 330 fs) in both liquid and glass phase isolate nuclear relaxation to the large‐amplitude motion of the triphenylamine moiety about the single bond, analogous to the twisted intramolecular charge‐transfer (TICT) model. The charge separation in the polymers′ emitting states is therefore increased, suggesting a potential approach to enhance quantum efficiency in devices otherwise limited by exciton recombination.

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## Abstract We estimate, at a full quantum‐chemical level, the various molecular parameters governing the rate of photoinduced charge generation and charge recombination in model organic structures containing a donor and an acceptor unit in view of the possible use of such systems in organic solar