Efficient single-emitting layer hybrid white organic light-emitting diodes with low efficiency roll-off, stable color and extremely high luminance

Abstract

An efficient single-emitting layer hybrid white organic light-emitting diode (WOLED) was developed, simultaneously fulfilling low efficiency roll-off, stable color and extreme luminance. At the practical luminance of 1000cd/m2, a total current efficiency of 42.8cd/A and power efficiency of 19.2lm/W are achieved, maintaining as high as 40.5cd/A and 15.5lm/W even at 5000cd/m2. Besides, a slight color variation [(0.025, 0.011)] and extreme luminance (∼106cd/m2) are obtained. The working mechanism is unveiled and it is demonstrated that the triplet-exciton-confining ability of electron transport layers plays a more vital role in device performances, particularly for the lifetime.