基于联苯骨架的新型双极主体材料的设计、合成及光电性能的研究

Phosphorescent organic light-emitting devices (PhOLEDs) using the heavy-metal phosphors as the emissive dyes can harvest both the electro-generated singlet excitons (25 %)and triplet excitons (75 %) for emission, elevating the internal quantum efficiency of the PhOLEDs up to 100 %. To avoid competitive de-excitation pathways like triplet-triplet annihilation and/or concentration quenching, these emissive heavy-metal phosphors as the guest materials are usually dispersed into host materials at low doping concentration. Therefore, host materials hold the same important position as the emissive phosphors, which play indispensible role for energy transferring and charge transporting in the emitting layer of PhOLEDs. In this study, the two molecules connected with hydrosulfonylbenzene as acceptor and diphenylamine/ 4,4-Dimethyldiphenylamine as donor by biphenyl skeleton at 2,2'- positon. Both of them gained high triplet SO2BPmDPA 2.66 eV and SO2BPDPA 2.70 eV, which are the potential host of the sky-blue PhOLED.