Exploiting a Dual-Fluorescence Process in Fluorene-Dibenzothiophene-S,S-dioxide Co-Polymers to Give Efficient Single Polymer LEDs with Broadened Emission.

King, S.M.; Perepichka, II; Perepichka, I.F.; Dias, F.B.; Bryce, M.R.; Monkman, A.P.

Abstract

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.

Citation

King, S., Perepichka, I., Perepichka, I., Dias, F., Bryce, M., & Monkman, A. (2009). Exploiting a Dual-Fluorescence Process in Fluorene-Dibenzothiophene-S,S-dioxide Co-Polymers to Give Efficient Single Polymer LEDs with Broadened Emission. Advanced Functional Materials, 19(4), 586-591. https://doi.org/10.1002/adfm.200801237

• Journal Article Type: Article
• Publication Date: 2009
• Deposit Date: Feb 16, 2012
• Journal: Advanced Functional Materials
• Print ISSN: 1616-301X
• Electronic ISSN: 1616-3028
• Publisher: Wiley
• Volume: 19
• Issue: 4
• Pages: 586-591
• DOI: https://doi.org/10.1002/adfm.200801237
• Public URL: https://durham-repository.worktribe.com/output/1504403