Abstract
In this work, a series of novel iridium (III) cyclometallated complexes BF–Ir1, BF–Ir2 and BF–Ir3 is developed by introducing a dibenzofuran moiety into the main ligand. The photophysical, thermal, and electroluminescent properties of these iridium (III) complexes are systematically investigated. Notably, the phosphorescent organic light-emitting diodes (PhOLEDs) with BF–Ir1, BF–Ir2 and BF–Ir3 as the green emitters displayed the maximum EQEs of 15.1%, 23.7% and 21.5%, respectively. In addition, an impressively high PE up to 96.8 l m W−1 is achieved in the device based on BF–Ir3. When the luminance reached 1000 and 10000 cd m−2, the corresponding EQE values of BF–Ir3-based PhOLEDs could be maintained at 20.7% and 18.5%. These results clearly demonstrate that dibenzofuran-based iridium (III) complexes have great potential for their application as green emitters in PhOLEDs to realize both high EQE and PE as well as low efficiency roll-off.
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