Journal
POLYMER
Volume 52, Issue 4, Pages 976-986Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2010.12.060
Keywords
Light-emitting polymer; Carbazole derivative; Dimesitylboron group
Categories
Funding
- National Science Council (NSC)
- Ministry of Education, Taiwan
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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 pi-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/m(2), and 0.51 cd/A, respectively. (C) 2011 Elsevier Ltd. All rights reserved.
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