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標題: Carbazole/fluorene copolymers with dimesitylboron pendants for blue light-emitting diodes
作者: Chen, Ying-Hsiao
Lin, Yu-Ying
Chen, Yung-Chung
Jiann, T.Lin
Lee, Rong-Ho
Kuo, Wen-Jang
Jeng, Ru-Jong
關鍵字: Light-emitting polymer;Carbazole derivative;Dimesitylboron group
出版社: Elsevier Ltd.
Project: Polymer, Volume 52, Issue 4, Page(s) 976-986.
A series of random and alternating carbazole/fluorene copolymers with various dimesitylboron-containing carbazole derivative contents were synthesized by Suzuki polymerization for use as a light-emitting layer in blue light-emitting diodes. Two carbazole derivatives, CzPhB and CzPhThB consisted of a carbazoyl group as the donor and a dimesitylboron group as the acceptor group, separated by phenyl and phenyl-thiophene groups π-conjugated systems, respectively. The copolymers exhibited good thermal stability and blue emission in both solution and the solid state. Moreover, the CzPhB/fluorene and CzPhThB/fluorene copolymers exhibited a higher PL quantum efficiency than the fluorene-based homopolymer (POF). Higher brightness and larger current efficiency were observed for the CzPhB/fluorene and CzPhThB/fluorene copolymer-based devices compared to the POF-based device. Additionally, the CzPhThB/fluorene copolymer-based devices had better EL performances than the CzPhB/fluorene copolymer-based devices. The turn-on voltage, maximal brightness, and highest luminescence efficiency of the carbazole/fluorene copolymer-based devices were found to be 4.5-8.5 V, 436 cd/m2, and 0.51 cd/A, respectively.
ISSN: 0032-3861
DOI: 10.1016/j.polymer.2010.12.060
Appears in Collections:化學工程學系所

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