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我们以钯为催化剂、通过一步交联耦合反应合成了一系列以螺[芴-9,9′-氧杂蒽](SFX)为基本构建单元的新型主体材料,这些材料具有较高的三线态能级和产率,可用作蓝色磷光材料的主体。接着,以这些材料和空穴传输型材料TAPC作为双主体、以FIrpic为发光客体,制作了蓝色磷光有机发光器件(PHOLED)。SFX主体材料可以向FIrpic提供有效的能量转移,而TAPC可以提高发光层的空穴迁移率、同时降低器件工作电压,因此我们制备的蓝色发光器件具有良好的性能。其中,以TAPC:PF-SFX和TAPC:C8OPF-SFX为双主体的两个PHOLED,最大电流效率和亮度分别达到22.56、25.93 cd?A~(-1)和6421、6196 cd?m~(-2)。上述实验结果表明,只存在C、H、O时,SFX是构建高效蓝色磷光主体材料的有效结构单元。
We have synthesized a series of novel host materials with spiro [fluorene-9,9’-xanthene] (SFX) as the basic building blocks through one-step cross-coupling reaction using palladium as catalyst. These materials have higher triplet states Energy level and yield, can be used as a blue phosphorescent host material. Next, a blue phosphorescent organic light-emitting device (PHOLED) was fabricated using these materials and the hole transporting material TAPC as a double host and FIrpic as a light emitting guest. SFX host material can provide effective energy transfer to FIrpic, and TAPC can improve the hole mobility of the light-emitting layer, while reducing the operating voltage of the device, so our prepared blue light-emitting device has good performance. The maximum current efficiency and brightness of the two PHOLEDs with TAPC: PF-SFX and TAPC: C8OPF-SFX as the double hosts reached 22.56, 25.93 cd? A -1 and 6421, 6196 cd? M ~ 2). The above experimental results show that SFX is an effective structural unit for constructing high-efficiency blue phosphorescent host material only in the presence of C, H, O.