Journal
ACS ENERGY LETTERS
Volume 3, Issue 7, Pages 1531-1538Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00711
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Funding
- National Natural Science Foundation of China [61704034, 51602065]
- Key Platforms and Research Projects of Department of Education of Guangdong Province [2016KTSCX034, 2016KTSCX031]
- Guangdong Science and Technology Plan [2017B010123002]
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For the first time, extremely simplified yet high-performance thermally activated delayed fluorescent (TADF) white organic light emitting diodes (WOLEDs) have been demonstrated. Unlike previous concepts, only a single molecular emitter is required for high-quality white emissions, where an intrinsic TADF emitter is sandwiched between p-type and n-type layers, forming a doping-free p-i-n WOLED. The WOLED exhibits a color rendering index (CRI) of 91, the first WOLED that overtakes its counterparts (single-emitter white polymer/inorganic LEDs). The maximum total external quantum efficiency (28.4%) and power efficiency (68.5 Im W-1) are comparable to those of state-of-the-art doped TADF WOLEDs and doping-free phosphorescent WOLEDs and higher than those of TADF WOLEDs with ultrahigh CRIs (>= 90) and high-quality single-emitter white LEDs. Significantly, this is the first TADF WOLED possessing ultrahigh CRIs at high luminance, and 18 796 cd m(-2) is 370% higher than that of the previous best-performing one. Moreover, the proposed WOLED is the simplest TADF WOLED.
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