【摘要】 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-5.22eV,接近阳极ITO/PEDOT∶PSS的能级(-5.20eV),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/Emissivelayer/CsF/Al的最大电流效率为10.4cd/A,最大亮度为34758cd/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.更多还原

【Abstract】 Hyperbranched electrophosphorescent polymers,which had a core of iridium complex,3,6-carbazole 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.更多还原