以铱配合物为核、3,6-咔唑为枝的超支化电磷光聚合物的合成与发光性能

采用Suzuki缩聚反应制备了以铱配合物为核、3,6-咔唑为枝的超支化电磷光聚合物(PCzIrMppy1和PCzIrMppy3). 超支化聚合物PCzIrMppy3的光致发光量子效率为62%, HOMO能级为-5.22 eV, 接近阳极ITO/PEDOT∶PSS的能级(-5.20 eV), 表明其优异的空穴注入性能. 以PCzIrMppy3聚合物为发光层制备的绿光电磷光电致发光器件ITO/PEDOT∶PSS/Emissive layer/CsF/Al的最大电流效率为10.4 cd/A, 最大亮度为34758 cd/m². 此外, 器件的效率随电流密度的衰减较慢, 说明这种超支化结构可有效减少高电流密度下的浓度猝灭.

Synthesis and Electroluminescent Properties of Hyperbranched Light-emitting Polymers with Iridium Complex as Core and 3,6-Carbazole as Branch

Hyperbranched electrophosphorescent polymers, which had a core of iridium complex, 3,6-carba-zole as branch, were synthesized by Suzuki polycondensation. The photoluminance quantum efficiency of the PCzIrMppy3 polymer was 62%, and the HOMO energy levels of the resulted polymers was -5.22 eV, respectively, which was very close to the anode ITO/PEDOT∶PSS of -5.20 eV, suggesting their excellent hole inject property. The green electrophosphorescent light-emitting device based on PCzIrMppy3 polymer with structure of ITO/PEDOT∶PSS/Emissive layer/CsF/Al achieved maximal luminous efficiency of 10.4 cd/A and maximal luminance of 34758 cd/m². Besides, the device performance was isolated with respect to current density, which indicated that this kind of hyper-branched molecular structure was quite favorable for reducing triplet annihilation of electrophosphorescent copolymers at high current density.