中文摘要：

设计了一系列新型芴-咔唑电磷光共轭聚合物.通过共价键将双（2-（9,9-二乙基-9H-芴-2-基）吡啶-N,C^2’）合铱（III）（Ir Fpy）接枝到3,6-二溴咔唑的N-烷基侧链,采用Suzuki缩聚反应合成了铱配合物（Ir Fpy）含量分别为0.25 mol%,0.5 mol%和1 mol%的聚合物PF-Ir Fpy.当引入的配合物Ir Fpy含量为1 mol%时,得到的共轭聚合物发射色坐标为（0.44,0.56）的黄光.随着接枝的铱配合物Ir Fpy在共轭聚合物中含量降低,作为主体的聚（9,9-二辛基芴）蓝光发射不能被完全淬灭,得到共聚物同时发射主体蓝光及客体铱配合物黄光的单分子白光共轭聚合物.共聚物发光器件结构为ITO/PEDOT：PSS（50 nm）/polymer＋PBD（30 wt%）（80nm）/Ba（4 nm）/Al（150 nm）[氧化铟锡/苯磺酸掺杂聚乙烯基二氧噻吩/聚合物＋（2,4-二苯-5-4-叔丁基苯-1,3,4-噁二唑）（w=30%）/钡/铝],基于共聚物PF-Ir Fpy025的器件流明效率为3.97 cd/A,色坐标为（0.34,0.34）,非常接近于标准白光发射的色坐标（0.33,0.33）.为了研究采用共聚物PF-Ir Fpy025和PF-Ir Fpy05制备的白光器件的光谱稳定性,测试了外加电压在8-13 V范围内的EL光谱,当外加电压从8 V升高到13 V时,两个EL器件都表现出了良好的EL光谱稳定性.研究结果表明,在共轭聚合物侧链上引入螯合金属铱配合物单元是实现高效、稳定的白光电致磷光器件的有效方法之一.

英文摘要：

A series of electrophosphorescent conjugated fluorene-alt-carbazole copolymers were designed.Metal complex iridium（ Ⅲ） bis-（ 9,9-diethyl-9H-fluoren-2-yl） pyridine（ Ir Fpy） is grafted in the N-alkyl group of carbazole by covalent bond linkage. The copolymers were synthesized by Suzuki polycondensation,the content of metal iridium complex（ Ir Fpy） was 0. 25 mol%,0. 5 mol% and 1 mol%,respectively. The yellowish light was obtained with the CIE of（ 0. 44,0. 56） with the Ir complex（ Ir Fpy） molar ratio in the copolymer of 1 mol%. With the decrease of iridium complex content,the single white light emitting copolymers were obtained due to the incomplete quench of the blue light emission. The electroluminescent devices were fabricated with configuration of ITO/PEDOT： PSS（ 50 nm）/polymer ＋ PBD（ 30 wt%）（ 80 nm）/Ba（ 4nm）/Al（ 150 nm）. The best device performance was achieved based on the polymer PF-Ir Fpy025,which exhibited a maximal luminous efficiency of 3. 97 cd/A with CIE of（ 0. 34,0. 34）,which are very close to the pure white-light point of（ 0. 33,0. 33）. To investigate the electroluminescent stabilities of white light emitting copolymers PF-Fpy025 and PF-Fpy05,electroluminescent spectra were tested with voltage from 8 V to 13 V.The two copolymers both showed good electroluminescent stabilities,when the voltage was increased from 8V to13 V. This result indicated that incorporation of the phosphorescent complex into the conjugated polymer side chains was an effective strategy to simultaneously realize high efficiency and relatively stable electroluminescence of phosphorescent polymer white light emitting diodes.