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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,C2’)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.
A series of novel fluorene-carbazole phosphorescent conjugated polymers were designed and synthesized by the covalent bonding of bis (2- (9,9-diethyl-9H-fluoren-2-yl) (Ir Fpy) was grafted onto the N-alkyl side chain of 3,6-dibromocarbazole. The content of Ir Fpy was 0.25 mol%, 0.5 mol% And 1 mol% of polymer PF-Ir Fpy. The resulting conjugated polymer emits a yellow color with a color coordinate of (0.44, 0.56) when the Ir Fpy content of the introduced complex is 1 mol% The iridium complex Ir Fpy is reduced in the conjugated polymer and the poly (9,9-dioctylfluorene) blue light emission as a host can not be completely quenched to obtain a copolymer that emits both the host blue light and the guest iridium complex yellow light (50 nm) / polymer + PBD (30 wt%) (80 nm) / Ba (4 nm) / Al Indium tin / benzene sulfonic acid doped polyethylene dioxythiophene / polymer + (2,4-diphenyl-5,4-tert-butyl benzene- 1,3,4- oxadiazole) (w = 30% ) / Barium / aluminum], the device based on the copolymer PF-Ir Fpy025 has a lumen efficiency of 3.97 cd / A and a color coordinate of (0.34, 0.34), very close to that of a standard white light emission (0.33,0.33) .In order to study the spectral stability of the white light devices prepared with the copolymers PF-Ir Fpy025 and PF-Ir Fpy05, the EL spectra of the applied voltage in the range of 8 ~ 13 V were tested. When the applied voltage was increased from 8 Both EL devices showed good EL spectral stability when V was raised to 13 V. The results show that the incorporation of chelated metal iridium complex units into the side chains of conjugated polymers is an efficient and stable white Photoelectronic phosphorescent device is one of the effective methods.