A new triphenylamine-based hyperbranched polyfluorene with oxadiazole units on its side chains |
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| Authors: | Guanglong Wu Yi Yang Chang He Xiaomin Chen |
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| Affiliation: | a Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
b Graduate University of Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | A new triphenylamine-based hyperbranched polymer with electron deficient units of oxadiazole on its side chains was successfully prepared by a modified Suzuki polycondensation with Pd(PPh3)4 as a catalyst, K2CO3 as a base, and a mixture of THF/toluene (1:1) as the solvent. The electron deficient units of oxadiazole were used to improve the electron injection and transport of the polymer. The results of the cyclic voltammetry (CV) of the polymer indicate that the HOMO and LUMO energy levels match well with the work function of the ITO/PEDOT anode and the metal cathode, respectively. Moreover, the hyperbranched polymer shows blue-emission and the hyperbranched structure effectively suppressed the formation of the aggregates/excimers in the polymer film. |
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| Keywords: | Hyperbranched polymer Suzuki polycondensation Triphenylamine Oxadiazole |
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