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以芴为原料,以钯为催化剂一步合成了2-(9-苯基芴基)-9,9′螺二芴(PF-SBF)。以PF-SBF作为有机发光二极管的发光及主体材料(FIrpic为磷光客体)时,观察到了不同于PF-SBF及FIrpic发光的红光带。这分别源于PF-SBF分子间的聚集和发光层/传输层诱导的激基复合物。通过选择合适的空穴和电子传输层,有效抑制了激基复合物的发光。同时,PF-SBF和TAPC双主体的结构不仅实现了纯FIrpic和Ir(ppy)_3蓝光和绿光,还大幅提升了器件性能。蓝光、绿光器件的最大电流效率和最大亮度分达到16.7、50.5 cd?A~(-1)和7857 cd?m~(-2)(11 V)、23390 cd?m~(-2)(8 V)。另外,除了PF-SBF,利用相似的合成方法,我们也合成了2-(9-苯基芴基)-9,9′螺芴氧杂蒽(PF-SFX),其较大的三线态能级(2.8 eV)较PF-SBF更适合做蓝光主体。以TAPC和PFSFX为双主体的器件最大电流效率提升到了22.6 cd?A~(-1)。所有实验结果均表明,PF-SBF和PF-SFX是构建高效绿光/蓝光磷光主体材料的有效结构单元。
Using fluorene as raw material, 2- (9-phenylfluorenyl) -9,9 ’spirobifluorene (PF-SBF) was synthesized in one step using palladium as catalyst. When PF-SBF was used as the light-emitting and host material for organic light-emitting diodes (FIrpic is a phosphorescent guest), red bands different from PF-SBF and FIrpic luminescence were observed. This is due, respectively, to the aggregation between the PF-SBF molecules and the exciplex induced by the luminescent / transport layer. By selecting suitable hole and electron transport layers, the luminescence of the exciplex is effectively suppressed. At the same time, the dual-body structure of PF-SBF and TAPC not only enables pure FIrpic and Ir (ppy) _3 blue and green light but also significantly improves device performance. The maximum current efficiency and the maximum brightness of blue and green devices reached 16.7, 50.5 cd? A -1 and 7857 cd? M -2 (11 V), and 23390 cd? M -2 8 V). In addition, 2- (9-phenylfluorenyl) -9,9 ’spirofluorene (PF-SFX) was also synthesized by a similar synthesis method except for PF-SBF. The larger triplet energy Grade (2.8 eV) is more suitable as a Blu-ray body than PF-SBF. The maximum current efficiency of the device with dual body of TAPC and PFSFX increased to 22.6 cd? A ~ (-1). All the experimental results show that PF-SBF and PF-SFX are effective structural units for the construction of highly efficient green / blue phosphorescent host materials.