Extremely high chromatic-stability white organic light-emitting device with symmetrical cascade emissive layer

The symmetrical cascade emissive layer WOLED exhibits extremely high chromatic-stability and high color rendering index (CRI) of 85-86 with ideal correlated color temperature (CCT) of 4407-4292 K at the voltage of 5-9 V, and also shows a peak current efficiency of 43.6 cd/A and a maximum power efficiency of 31.1 lm/W. (a) Device configurations of WOLED with symmetrical cascade emissive layer; (b) a photo of a large area (40 mm × 40 mm) the symmetrical cascade emissive layer WOLED illuminating a collection of colorful candies at a luminance level of above 1000 cd/m2 with a CRI of 85.226