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Carbazole/fluorene copolymers with dimesitylboron pendants for blue light-emitting diodes |
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| Authors: | Ying-Hsiao Chen Yung-Chung Chen Rong-Ho Lee Wen-Jang Kuo |
| Affiliation: | a Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan b Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan c Department of Applied Chemistry, National University of Kaohsiung, Kaohsiung 811, Taiwan |
| Abstract: | 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. |
| Keywords: | Light-emitting polymer Carbazole derivative Dimesitylboron group |
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