Synthesis and optical properties of light-emitting π-conjugated polymers containing biphenyl and dithienosilole

Date

2007-05-15

Author

LIAO, Liang
Çırpan, Ali
CHU, Qinghui
KARASZ, Frank E.
PANG, YI

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Copolymers containing oligo(phenylene vinylene) (2.5), fluorene, and 4,4-dihexyldithienosilole (DTS) units were synthesized and characterized. The pi-conjugated monomers were joined with the palladium(0)-catalyzed Suzuki-Miyaura coupling reaction, thus forming either biphenyl- or phenyl-thiophene linkages. These polymers were photoluminescent, with the fluorescent quantum efficiency between 54 and 63% and with),lambda(max) for fluorescence at similar to 448 nm in tetrahydrofuran. The presence of 5% DTS in the copolymers had little influence on the optical absorption and emission wavelengths. Double-layer light-emitting-diode devices using these polymers as emissive layers had low turn-on voltages (3.5-4 V) and moderate external quantum efficiencies (0.14-0.30%). The results show that DTS plays a positive role in improving the charge-injection characteristics of poly(phenylene vinylene) materials.

Subject Keywords

Organic Chemistry, Materials Chemistry, Polymers and Plastics

URI

https://hdl.handle.net/11511/37749

Collections

Department of Chemistry, Article