Abstract
Efficient orange phosphorescent organic light-emitting devices based on simplified structure with maximum efficiencies of 46.5lm/W and 51.5cd/A were reported. One device had extremely low efficiency roll-off with efficiencies of 50.6cd/A, 45.0cd/A and 39.2cd/A at 1000cd/m2, 5000cd/m2 and 10,000cd/m2 respectively. The reduced efficiency roll-off was attributed to more balanced carrier injection and broader recombination zone. The designed simplified white device showed much lower efficiency roll-off than the control one based on multiple emitting layers. The efficiency of simplified white device was 40.8cd/A at 1000cd/m2 with Commission Internationale de I’Eclairage coordinates of (0.39, 0.46).
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