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论文类型：期刊论文

发表时间：2012-10-12

发表刊物：POLYMER

收录刊物：SCIE、EI、Scopus

卷号：53

期号：22

页面范围：5116-5123

ISSN号：0032-3861

关键字：Dendrimer; Pyrene; Carbazole

摘要：Three generations of dendrimers (G1, G2 and G3) with a pyrene core and 9-phenylcarbazole derivatives dendrons have been designed and synthesized by convergent approach. Their chemical structures were well characterized by means of H-1 NMR, IR spectroscopy, MALDI-TOF MS and elemental analysis. The studies revealed interesting effects of topological variation with incremental generation number on the thermal, photophysical and electrochemical properties of the dendrimers. The results showed that they displayed excellent thermal stability with 5% weight-loss temperature up to 610 degrees C and high glass-transition temperature (260 degrees C for G3). The HOMO and energy band gaps of materials could be modulated by changing the generation of the dendrimers. Compared to G1 and G2, the higher generation G3 had significantly enhanced photoluminescent quantum yield from 86.9 to 99.5%, and exhibited good stability for hole and electron injection. (C) 2012 Elsevier Ltd. All rights reserved.