【摘要】 以噻吨酮作为受体、3,6-（二咔唑基）三咔唑作为给体设计合成了一种具有延迟荧光特性的Y型分子（TX-TCz）。模拟计算表明化合物HOMO和LUMO能级完全分离且在苯环上存在较小的重叠，有助于获得小的S₁和T₁的能级差ΔE_ST。随着溶剂极性的增加，化合物发射峰发生明显的红移且由于电荷转移态和局域激发态的共存产生了双峰发射。在纯膜中TX-TCz的发射峰位于513 nm，量子产率为11.5%。基于低温下荧光和磷光发射峰，计算得到化合物的ΔE_ST为0.03 e V，并且检测到μs级的寿命，说明化合物具有延迟荧光发射。与此同时，化合物展示了良好的热稳定性能和电化学性能，有助于制备高性能OLED器件。其在掺杂浓度为5%（wt）的器件中展示了良好的蓝光性能，发射峰位于463 nm，最大外量子效率为1.53%；在非掺杂器件中展示了良好的绿光发射（522 nm），最大外量子效率达到1.81%。更多还原

【Abstract】 A novel Y-type emitter （TX-TCz） with delayed fluorescence characteristic was designed and synthesized using thioxanthone group as the acceptor and 6-（9H-carbazol-9-yl）-9H-3,9’-bicarbazole moiety as the donor.Theoretical calculations showed the prominent separation of HOMO and LUMO levels with only a small overlap on the benzene ring,which helped to achieve the small energy band gapΔE_ST between the S₁ and T₁.With the increasing polarities of solvents,the emission peaks of TX-TCz exhibited an obvious red shift and dual emission peaks generated because of the coexistence of charge transfer state and locally excited state.In the pure film,the emission peak of TX-TCz was located at 513 nm with the photoluminescence quantum yields （PLQY） of 11.5%.According to the fluorescence and phosphorescence emission at low temperature，ΔE_ST of 0.03 e V between S₁ and T₁ was calculated,at the same timeμs magnitude lifetime was also detected.It indicated that TX-TCz had the considerable delayed fluorescence characteristic.In addition,TX-TCz had good thermal stability and electrochemical properties,which was helpful for the preparation of high-performance OLED devices.In the doped devices with the doping concentration of 5%（wt）,TX-TCz showed excellent blue light performance with the emission peak at 463 nm and the maximum external quantum efficiency （EQE） of 1.53%.In the non-doped device,good green emission at 522 nm was obtained with a maximum EQE of 1.81%更多还原