Abstract
(4,4′-N, N′-dicarbazole) biphenyl (CBP) serves as an efficient host material in the phosphorescent organic light emitting diodes (PHOLEDs) based on green-emitting Ir(ppy)3 dopant with relatively low-cost charge transporting layers, resulting the higher device efficiencies of 31.45 cd/A, 10 %, and 11.3 lm/W with the maximum luminance of 60,170 cd/m2 with highly improved efficiency roll-off when compared to those (24.08 cd/A, 7.98 %, and 14.16 lm/W with a maximum luminance of 19,090 cd/m2) of 9,9′-bis-(9,9-dimethyl-9H-fluoren-2-yl)-9H,9′H-[3,3′]bicarbazolyl (BDFC) host based device.
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