Synthesis and Characterization of 1,2,4-Oxadiazole-Based Deep-Blue and Blue Color Emitting Polymers
作者:Rajalingam Agneeswari、Vellaiappillai Tamilavan、Myung Ho Hyun
DOI:10.5012/bkcs.2014.35.2.513
日期:2014.2.20
Two donor-acceptor-donor monomers such as 3,5-bis(4-bromophenyl)-1,2,4-oxadiazole (BOB) and 3,5-bis(5-bromothiophen-2-yl)-1,2,4-oxadiazole (TOT) incorporating electron transporting and hole blocking 1,2,4-oxadiazloe moiety were copolymerized with light emitting fluorene derivative via Suzuki polycondensation to afford two new polymers, PFBOB and PFTOT, respectively. The optical studies for polymers PFBOB and PFTOT revealed that the band gaps are 3.10 eV and 2.72 eV, respectively, and polymer PFBOB exhibited a deep-blue emission while polymer PFTOT showed blue emission in chloroform and as thin film. The photoluminescence quantum efficiencies ($\Phi}_f$) of polymers PFBOB and PFTOT in chloroform calculated against highly blue emitting 9,10-diphenylanthracene (DPA, $\Phi}_f=0.90$) were 1.00 and 0.44, respectively.
两种供体-受体-供体单体,例如3,5-双(4-溴苯基)-1,2,4-恶二唑(BOB)和3,5-双(5-溴噻吩-2-基)-1,2,结合电子传输和空穴阻挡1,2,4-恶二唑部分的4-恶二唑(TOT)与发光芴衍生物通过Suzuki缩聚反应共聚,分别得到两种新聚合物:PFBOB和PFTOT。聚合物PFBOB和PFTOT的光学研究表明,其带隙分别为3.10 eV和2.72 eV,并且聚合物PFOBB表现出深蓝色发射,而聚合物PFTOT在氯仿和薄膜中表现出蓝色发射。聚合物 PFBOB 和 PFTOT 在氯仿中的光致发光量子效率 ($\Phi}_f$) 根据高蓝光发射的 9,10-二苯基蒽 (DPA, $\Phi}_f= 0.90$) 分别为 1.00 和 0.44。