期刊
ADVANCED FUNCTIONAL MATERIALS
卷 19, 期 4, 页码 586-591出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200801237
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- Durham University
- Wiley InterScience
- EPSRC through the ESF Eurocores SONS Program
- CENAMPS
- Durham County Council via the Nano and Microelectronics and Photonics Single
A description of the synthesis of random (9,9-dioctylfluorene-2,7-diyl)-dibenzothiophene-S,S-dioxide-3,7-diyl) co-polymers (p(F-S)x) by palladium- catalyzed Suzuki cross-coupling polymerization where the feed ration of the latter is varied from 2 to 30 mol % (i.e., x=2-30) is given. Polymer light emitting devices are fabricated with the configuration indium tin oxide/poly(3,4-ethylenediocythiophene):poly(styrenesulfonic acid)/p(F-S)x/Ba/Al. The device external quantum efficiency increased as the ration of the S co-monomer was increased, up to a maximum of 1.3% at 100 mA cm(-2) for p(F-S)30 and a brightness of 3 770 cd m(-2) (at 10V). The S units impart improved electron injection, more balanced mobilities, and markedly improved device performance compared to poly(9,9-dioctylflouorene) under similar conditions. These co-polymers display broad emission, observed as greenish-white light, which arises from dual fluorescence, viz. both local excited states and charge transfer states. Utilizing dual emission can reduce problems associated with Forster energy transfer from high-energy to-low energy excited states.
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