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Abstract
A novel bipolar host material 2-(2′-(5-(dibenzo[b,d]furan-4-yl)-1H-indol-1-yl)-[1,1′-biphenyl]-3-yl)-1-phenyl-1H-benzo[d]imidazole (DY1) based on electron-donating indole and electron-withdrawing benzimidazole was designed and synthesized for solution-processed phosphorescent organic light-emitting diodes (PhOLEDs). The highly distorted conformation derived from the orthogonally connected donor and acceptor on the 1,3′-biphenyl bridge endowed DY1 with high thermal stability (Tg 122 °C) and a high triplet energy of 2.69 eV. Solution-processed PhOLEDs fabricated with DY1 host achieved excellent performance of 47.05 cd/A, 34.0 lm/W and 14.27% for green PhOLED, and 32.95 cd/A, 17.0 lm/W and 16.57% for the red PhOLED, respectively. This result revealed the structural advantage of the host material in high efficiency and low efficiency roll-off in PhOLEDs.
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