Journal
APPLIED SURFACE SCIENCE
Volume 487, Issue -, Pages 610-615Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.05.160
Keywords
Ultra-thin emitting layer; Doping-free white organic light-emitting diodes; Thermally activated delayed fluorescence inter-layer
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Funding
- Foundations of National Natural Science Foundation of China (NSFC) [51503022, 61705026, U1663229]
- Chongqing Science and Technology Commission [cstc2015jcyjA50036, cstc2016jcyjys0006, cstc2016jcyj0367]
- research project for Chongqing University of Arts and Sciences [Z2018CL10]
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Choosing an appropriate interlayer (IL) is still a crucial challenge for charge balance and exciton regulation in ultra-thin doping-free white organic light-emitting diodes (WOLEDs). Herein, for the first time, the blue thermally activated delayed fluorescence (TADF) 10, 10, 10-(4, 4, 4-Phosphoryltris (benzene-4, 1-diyl)) Iris (10Hphenoxazine) (TPXZPO) was selected as the n-type inter-layer (IL) switch. The monochromatic and white light device achieved maximum external quantum efficiencies (EQE) of 24.47% and 14.96%, respectively. More importantly, all devices exhibited extremely low turn-on voltage and stable electroluminescent spectra, with CIE coordinates Delta (x, y) varying only by (0.01, 0.01) in the luminance range of 100 to 10,000 cd/m(2). The results showed that new-type IL plays a crucial role in regulating charge and exciton distribution, which could effectively control of the emission zone and the triplet exciton density. This excellent performance demonstrates that the introduction of TADF IL is a promising prospect in the application of high-performance ultra-thin doping-free WOLEDs.
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