三苯基吡啶-芴交替共轭聚合物的合成与光致发光性能研究

SYNTHESIS OF(FLOURENE-alt-TRIPHENYLPYRIDINYL) COPOLYMERS AND THEIR PHOTOLUMINESCENCE PROPERTIES

通过Suzuki偶合反应得到了两种间位连接的三苯基吡啶同分异构体和9,9-二辛基芴的交替共聚物PFOTPP1和PFOTPP2.并对它们的紫外-可见吸收光谱、光致发光光谱以及电化学性能等进行了初步研究.结果表明,将间位连接的三苯基吡啶基引入聚芴主链能使聚合物的LUMO能级降低,光致发光光谱发生蓝移,得到了两种有望应用于电致炼光发光器件的共轭聚合物蓝光发光材料.

Two wide band gap alternating copolymers（PFOTPP1 and PFOTPP2） derived from 9,9-dioctylfluorene and 2,6-bis（3-bromophenyl）-4-phenylpyridine（TPP1）,2,6-diphenyl-4-（3,5-dibromophenyl）pyridine（TPP2） were synthesized by Suzuki coupling reaction.The resulted polymers are soluble in common organic solvents such as toluene chloroform etc.The maximal absorption peaks of PFOTPP1 are around 325 nm in THF solution and 329 nm in solid thin film,The maximal absorption peaks of PFOTPP2 are around 329 nm in THF solution and 331 nm in solid thin film.PFOTPP1 and PFOTPP2 show two photoluminescence peaks around 367 nm and 383 nm in THF solution,and around 395 nm and 413 nm in solid thin film,respectively.The LUMO levels of PFOTPP1 and PFOTPP2 are around-2.53 eV and-2.64 eV.The glasstransition temperature of PFOTPP1 and PFOTPP2 is around 145℃ and 152℃,respectively.The thermal degradation temperature of PFOTPP1 and PFOTPP2 is above 400℃.It indicates that the energy levels of the polymers are widened and the LUMO levels of the polymers are increased with introducing the triphenylpyridine unit into the polyfluorene back bone.