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High-efficiency blue electrophosphorescent organic light-emitting devices employing MoO 3 used as hole injection layer(HIL) and MoO 3 doped N,N-dicarbazoly-3,5-benzene(mCP) as hole transport layer(HTL) were demonstrated. The blue OLED with the novel anode structure and TAPC used as electron blocking layer show a low turn-on voltage of 2.4 V, a maximum power efficiency of 33.6 lm/W at 3.1 V and 25 lm/W with 1 000 cd/m2at 3.8 V. It is also found that the efficiency of the devices is dependent on the different EBL materials. This is may because of relationship with the charge mobility and the triplet energy level of EBL materials. The device efficiency is determined by the charge balance which plays an important role.
High-efficiency blue electrophosphorescent organic light-emitting devices employing MoO 3 as hole injection layer (HIL) and MoO 3 doped N, N-dicarbazoly-3,5-benzene (mCP) as hole transport layer blue OLED with the novel anode structure and TAPC used as electron blocking layer show a low turn-on voltage of 2.4 V, a maximum power efficiency of 33.6 lm / W at 3.1 V and 25 lm / W with 1000 cd / m2at 3.8 V It is also found that the efficiency of the devices is dependent on the different EBL materials. This is may because of relationship with the charge mobility and the triplet energy level of EBL materials. important role.