Gao Chao1,Wu Hongcai1, Yi Wenhui1,Li Baoming1,Dong Faxin2
(1.School of Electronics and Information Engineering,Xi'an Jiaotong University,Xi'an 710049,China;2.Department of Chemistry,Northwest University,Xi'an 710069,China)
Abstract:In order to investigate the effect of aromatic group in side-chain on the luminescence performance of polythiophene derivatives, a reactive monomer of 3-biphenylthiophene was prepared by coupling 3-bromothiophene with biphenyl bromide,then the monomer was polymerized by oxidation coupling polymerization of -biphenylthiophene using iron (III) chloride as catalyst in chloroform.The produced poly(3-biphenyl)thiophene(PBPTH) were characterized by infrared spectrum,UV-vis absorption spectrum and1H NMR.The maximum peak in UV-vis spectrum of PBPTH is at 406nm,the blue-shifte is 34 nm comparing with that of poly(3-octyl)thiophene(P3OT, the maximum peak is about 440nm).Furthermore, the photoluminescence peak of PBPTH locates at 547 nm, the blue-shift is about 32 nm related to P3OT. Research results show that the blueshifts in UV-vis spectrum and photoluminescence (PL) spectrum are formed by the steric hindrance of biphenyl group,which decreases the effective conjugating length of PBPTH. The PL intensity of PBPTH solution is decreased greatly related to P3OT, which imply that the biphenyl group cannot compensate enough for the loss of the effective conjugating length to the PL performance.
Keywords：poly(3-biphenyl)thiophene;synthesis;photoluminescence