基于闭环二苯醚与磷氧基团的主体材料的合成及其在蓝色磷光有机发光二极管中的应用

Synthesis of novel host material based on cyclized diphenyl ether/phosphine oxide and its application in highly efficient phosphorescent organic light-emitting diodes

本文通过多步有机反应制备了化合物9-苯基-9′-(4-二苯基氧化膦)苯基-氧杂蒽[diphenyl(4-(9-phenyl-9H-xanthen-9-yl)phenyl)phosphine oxide,DPPO],低温磷光发射光谱测试表明该化合物具有高的三线态能级(2.88eV),它可以作为天蓝色磷光发光材料双(4,6-二氟苯基吡啶-N,C2)吡啶甲酰合铱[bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(Ⅲ),FIrpic,ET=2.62eV]的主体材料.将主体材料DPPO用于蓝色磷光有机发光二极管中,该器件在100cd/m2的亮度下,电流效率和流明效率分别达到30.6cd/A和19.2lm/W,最大外量子效率达到13.6%.

A novel host material diphenyl（4-（9-phenyl-9H-xanthen-9-yl）phenyl）phosphine oxide （DPPO） was synthesized and characterized. The phosphorescent spectrum shows that this new compound possesses high triplet energy level and can be used as host material for the sky-blue emitter bis（4,6-difluorophenylpyridine）（picolinate） iridium （III） （Flrpic） in phosphorescent OLED. Consequently, the device performance based on DPPO as host material exhibits a current efficiency of 30.6 cd/A, a luminance efficiency of 19.2 lm/W and a maximum external quantum efficiency of 13.6% at the luminance of 100 cd/m^2.