含有烷基侧链的杂环芴基共聚物的光电性能  

Optoelectronic Property of Fluorene-based Copolymers with Alkyl Chain Incorporating into Heterocycles

作　　者：章勇[1,2] 杨坚[1] 彭俊彪[1] 曹镛[1] 

机构地区：[1]华南理工大学高分子光电材料与器件研究所,特种功能材料及其制备新技术教育部重点实验室,广东广州510640 [2]华南师范大学光电子材料与技术研究所

出　　处：《发光学报》2006年第4期531-536,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(90201023);国家"973"计划(2002CB613405);华南师范大学博士启动基金(843200)资助项目

摘　　要：通过对9,9-二辛基芴(DOF)与4,7-二噻吩-2,1,3-萘并噻二唑(DNT)共聚物(PFDNT)和9,9-二辛基芴(DOF)与4,7-二(3-己基噻吩)-2,1,3-萘并噻二唑(HDNT)共聚物(PFHDNT)的光电特性进行比较研究,发现烷基侧链上引入杂环窄带隙单体能有效提高芴基共聚物的分子量和光荧光的量子产率。共聚物PFHDNT的光致发光和电致发光峰相对于共聚物PFDNT发生了蓝移,可能是由于长烷基侧链的空间位阻减小了π→π*有效共轭长度导致其发射峰发生蓝移。此外共聚物PFHDNT器件的电荧光量子效率并未由于引入烷基侧链而降低。Copolymerization is one of effective approaches for preparation of high performance emitting conjugated polymers. The emission color of polyfluorene can be tuned over the entire visible region by different incorporating narrow-band-gap （NBG） comonomers into the polyfluorene backbone. So photophysical properties of fluorene-based copolymers strongly depend on NBG comonomers. Based on comparative studies for optoelectronic performance of copolymers （PFDNT） of 9,9-dioctyfluorene （DOF） and 4,7-di （ thien-2-yl ） -2,1,3-naphthothiadiazole and copolymers （PFHDNT） of 9,9-dioctyfluorene （DOF） and 4,7-di （ 4-hexylthien-2-yl ） - 2,1,3-naphthothiadiazole, it has been found that the photoluminescence efficiencies of copolymer PFHDNT are significantly enhanced due to incorporation of alkyl chain into NBG heterocycle comonomers reducing interchain interaction of copolymer PFHDNT. In comparison with copolymer PFDNT without alky substitution on both thiophene rings, copolymer PFHDNT shows blueshift photoluminescence （PL） and electroluminescence （EL） emission at the same copolymerization ratio as a result of the introduction of the long alkyl chain into the thiophene ring enhancing steric hindrance and reducing the energy of π-π＊ transition. In addition, the alkyl side chain in the 4-position of both thiophene rings can increase the NBG comonomer solubility in copolymerization reaction, thus the molecular weight of the resulted copolymers could be improved. On the other hand, the electroluminescent efficiencies of those copolymers are not reduced because of incorporating alkyl chain into the NBG comonomers.

关 键 词：芴基共聚物 窄带隙单体 电致发光 

分 类 号：O482.31[理学—固体物理] TN383.1[理学—物理]