| 초록 |
We studied and synthesized a bipolar host material using carbazole and phosphine oxide group for high performance blue phosphorescent organic light emitting diodes. The (9-phenyl-9H-carbazole-2,5-dyil)bis(diphenylphosphine oxide) (PCPO25) with the phosphine oxide groups at 2,5 positions of carbazole showed high thermal and morphological stability, and high device performances in blue PHOLEDs. The PCPO25 showed high triplet energy of 2.81eV for energy transfer to blue emitting iridium(III) bis[(4,6-difluorophenyl)-pyridinato-N,C2]picolinateand provided high quantum efficiency of 31.4%, current efficiency of 54 cd/A and power efficiency of 53.1 lm/W. |
