Abstract
A new bipolar host material (PBCz-PO) consisting a phosphinic amide is developed to show a resonance effect. It possesses quite high triplet energy (2.76eV), and this high triplet energy make it suitable to be blue host in phosphorescent organic light-emitting diodes (PHOLEDs). The device with PBCz-PO as a host and FIrpic as a dopant achieved a maximum current efficiency (ηc) of 31.5cd/A, a maximum power efficiency (ηp) of 31.0lm/W and a maximum external quantum efficiency (EQE) of 13.4% as well as low driving voltage.
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