Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201807541
Keywords
binary emitters; color remedy strategy; color rendering index; high efficiency; white organic light-emitting diodes
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Funding
- National Natural Science Foundation of China [61575136, 21572152, 51773141, 51873139]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- Joint International Research Laboratory of Carbon-Based Functional Materials and Devices
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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) approximate to 5000 K) to eye-friendly warm white-emission (CCT approximate to 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.
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