Journal
SCIENCE BULLETIN
Volume 62, Issue 17, Pages 1193-1200Publisher
SCIENCE PRESS
DOI: 10.1016/j.scib.2017.08.021
Keywords
Organic light-emitting diodes; Doping-free; Tandem; White; Efficiency
Categories
Funding
- National Basic Research Program of China [2015CB655004]
- National Natural Science Foundation of China [61401156, U1601651, U1301243]
- Pearl Rive S&T Nova Program of Guangzhou [201710010066, 201610010052]
- Fundamental Research Funds for the Central Universities [2017MS008]
- China Postdoctoral Science Foundation [2017T100627]
- Tiptop Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program [2015TQ01C777, 2016TQ03C331]
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Tandem white organic light-emitting diodes (WOLEDs) are of great research interest since they can greatly boost the performance compared with the single-unit counterparts. However, their structures are more complicated than those of single-unit OLEDs. Besides, to achieve high performance, the doping technology is required to tandem OLEDs, particularly for tandem WOLEDs, further complicating the structures. Herein, doping-free tandem WOLEDs, for the first time, have been demonstrated. By managing an effective doping-free charge generation layer to interconnect doping-free emitting layers/charge transport layers, high-performance doping-free tandem WOLEDs have been developed. The blue-yellow device accomplishes the simplified structure/short fabrication time/reduced cost/high efficiency/low efficiency roll-off/low voltage/high luminance trade-off, which cannot be achieved by previous tandem WOLEDs. Remarkably, the efficiency (81.2 cd A(-1)) is similar to 2-fold higher than the highest efficiency of previous doping-free WOLEDs and even higher than those of some best doping tandem WOLEDs. The maximum luminance is 44,886 cd m(-2), which is the highest for doping-free WOLEDs. Besides, the blue-red device can exhibit a color rendering index (CRI) of 67, which is even higher than that of some representative three-color tandem WOLEDs. Such findings may not only represent a significant step for doping-free WOLEDs, but unlock a novel avenue that doping-free tandem WOLEDs are promising to achieve the simplicity and high performance trade-off. (C) 2017 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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