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

2007-05-15
LIAO, Liang
Çırpan, Ali
CHU, Qinghui
KARASZ, Frank E.
PANG, YI
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.
Journal of Polymer Science, Part A: Polymer Chemistry

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Citation Formats
L. LIAO, A. Çırpan, Q. CHU, F. E. KARASZ, and Y. PANG, “Synthesis and optical properties of light-emitting π-conjugated polymers containing biphenyl and dithienosilole,” Journal of Polymer Science, Part A: Polymer Chemistry, pp. 2048–2058, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37749.