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Novel fluorene-based light-emitting copolymers containing cyanophenyl pendants and carbazole-triphenylamines: Synthesis, characterization and their PLED application |
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| Authors: | Ying Lin Zhi-Kuan Chen Teng-Ling Ye Dong-Ge Ma Qin-De Liu |
| Affiliation: | a Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore b Department of Chemistry, Lab for Advanced Materials, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China c State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Changchun 130022, People's Republic of China |
| Abstract: | A series of novel blue light-emitting copolymers PCC-1, PCC-2, and PCC-3, composed of different ratios of electron-withdrawing segments (spirobifluorene substituted with cyanophenyl groups) and electron-donating segments (carbazole-triphenylamines), has been synthesized and characterized. In order to investigate the effect of hole/electron charge transporting segments, two reference polymers PSF and PCF, containing only one charge transporting moiety in the polymer backbone, were also synthesized. Incorporation of the rigid spirobifluorene units substituted with cyanophenyl groups into the polymer backbone improved not only the thermal stabilities but also the photoluminescence efficiencies. The polymers except PSF possess similar hole injection barriers but different hole transporting abilities. With the device configuration of ITO/PEDOT:PSS/polymers:PBD/CsF/Ca/Al, PCC-2 showed the best performance with the lowest turn-on voltage of 3.1 V, the highest luminance of 6369 cd/m2, the highest current efficiency of 1.97 cd/A, and the best power efficiency of 1.40 lm/w. |
| Keywords: | Cyanophenyl groups Carbazole-triphenylamines Blue light-emitting Electron-withdrawing Electron-donating |
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