High-Quality White Organic Light-Emitting Diodes Composed of Binary Emitters with Color Rendering Index Exceeding 80 by Utilizing Color Remedy Strategy

Implementing rigorous standards for high-quality white organic light-emitting diodes (WOLEDs) demands further investigation. Herein, a novel and feasible color remedy strategy (CRS) is proposed in WOLEDs composed of binary-emitters, to arouse the green-emission, thereby complementing the spectral deficiency in white-emission. Thus, the color rendering indexes (CRIs) of binary-emissive WOLEDs can be boosted from 63 to 80 threshold, and the Commission International de I'Eclairage-(x, y) coordinates are precisely located inside the American National Standard Institute quadrangles, which can rival the WOLEDs integrating ternary or more emitters. Moreover, it is more feasible for CRS-based binary-emissive system to tune white-emission from cool white-emission (correlated color temperature (CCT) ≈ 5000 K) to eye-friendly warm white-emission (CCT ≈ 2000 K). Meanwhile, benefiting from the reduced energy loss and low driving voltage of CRS zone, all of the CRS-based WOLEDs with diverse CCTs can exceed 20% external quantum efficiency, and the highest approach 25%, as well as the highest power efficiency beyond 60 lm W ⁻¹ , which is comparable with those reported employing light-extracting techniques. In addition, it is evident that CRS-based WOLEDs also exhibit outstanding color stability within the variation of luminance in several orders of magnitude (50–12 000 cd m ⁻² ). Thus, this novel CRS provides an innovative pathway to fabricate high-quality WOLEDs composed of binary emitters.