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为了筛选高效稳定的聚合物电致蓝光材料,设计合成了三苯胺和芴取代的二芳基芴单体,并通过Suzuki缩聚合成了交替共聚物TPAFF-co-F和TPAFF-co-P.将二辛基芴引入聚芴的9位可以增加其溶解度,同时具有屏蔽主链和减少主链芴9位被氧化的作用,三苯胺基团将有利于提高空穴在阳极界面的注入能力.200℃下空气中退火24h实验表明,在相同条件下,绿光指数(Igreen/Iblue)顺序为聚(9,9-二辛基芴)(1.07)>TPAFF-co-F(0.65)>TPAFF-co-P(0.47),证明了烷基芴引入减少了主链氧化的几率.还制作了发光二极管器件,其结构为ITO/PEDOT:PSS(40nm)/TPAFF-co-F或TPAFF-co-P(80nm)/Ba(4nm)/Al(120nm).在高电流密度下它们保持了良好的光谱稳定性,在547mA·cm-2电流密度下,TPAFF-co-F的CIE(国际发光照明委员会)坐标为(0.22,0.24),TPAFF-co-P的CIE坐标为(0.24,0.26),后者的电流效率为0.712cd·A-1.
In order to screen highly efficient and stable polymer blue electroluminescent materials, triphenyl amine and fluorene substituted diarylfluorene monomers were designed and synthesized, and the alternating copolymers TPAFF-co-F and TPAFF-co-P were synthesized by Suzuki condensation. The introduction of dioctylfluorene into polyfluorene at position 9 can increase its solubility, shield the main chain and reduce the oxidation of 9-position main chain fluorene, and the triphenylamine group will improve the hole injection ability at the anode interface. ℃ in air for 24 h showed that under the same conditions, the order of Igreen / Iblue was poly (9,9-dioctylfluorene) (1.07)> TPAFF-co-F (0.65)> TPAFF- co-P (0.47), which proved that the introduction of alkyl fluorene reduced the probability of main chain oxidation.An LED device was also fabricated with ITO / PEDOT: PSS (40nm) / TPAFF-co-F or TPAFF-co- P (80nm) / Ba (4nm) / Al (120nm). They maintain good spectral stability at high current densities and the CIE of TPAFF-co-F at 547mA · cm- Commission) coordinates (0.22,0.24), CIE coordinates of TPAFF-co-P (0.24,0.26), the latter of the current efficiency of 0.712cd · A-1.