Yellow OLEDs based on bipolar host materials show a maximum current efficiency of 44.4 cd A−1 with low efficiency roll-off.
Highly efficient yellow OLEDs based on bipolar host materials show a maximum current efficiency of 68.28 cd A−1, a maximum external quantum efficiency of 21.3% and a maximum power efficiency of 50.90 lm W−1 with low efficiency roll-off.