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

• A simplified but high-performance hybrid WOLED has been developed.
• At 1000 cd/m2, a total CE of 42.8 cd/A and PE of 19.2 lm/W are achieved.
• The efficiency roll-off is rather low and the color-stability is excellent.
• A luminance of 97,067 cd/m2 is obtained, the highest among hybrid WOLEDs.
• The triplet-exciton-confining ability of ETLs is significant in hybrid WOLEDs, particularly for the lifetime.

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 1000 cd/m2, a total current efficiency of 42.8 cd/A and power efficiency of 19.2 lm/W are achieved, maintaining as high as 40.5 cd/A and 15.5 lm/W even at 5000 cd/m2. Besides, a slight color variation [(0.025, 0.011)] and extreme luminance (∼106 cd/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.

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