Journal
JOURNAL OF LUMINESCENCE
Volume 184, Issue -, Pages 287-292Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2016.11.067
Keywords
White organic light-emitting device; Non-doped emitting layer; Thermally activated delayed fluorescent; Ultrathin phosphorescent emitter
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Funding
- Foundation of the National Natural Science Foundation of China (NSFC) [61675041]
- Foundation for Innovation Research Groups of the NSFC [61421002]
- National Science Foundation for Young Scientists of China [61605253]
- Science and Technology Planning Project of Guangdong [2015B090913003]
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Hybrid white organic light-emitting devices (OLEDs) are fabricated by employing non-doped emitting layers (EMLs), which are consisted of a blue thermally activated delayed fluorescent (TADF) emitter 9,9-dimethyl-9,10-dihydroacridine-diphenylsulfone (DMAC-DPS) and an ultrathin yellow iridium complex bis[2-(4-tertbutylphenyl)benzothiazolato-N,C-2'] iridium (acetylacetonate) [(tbt)(2)Ir(acac)]. With thickness optimization of DMAC-DPS, a white OLED achieves maximum current efficiency, power efficiency and external quantum efficiency of 34.9 cd/A, 29.2 lm/W and 11.4%, respectively, as well as warm white emission with relatively stable electroluminescence spectra. The results suggest that, bipolar charge carrier transport property and concentration independent property of DMAC-DPS, charge carrier trapping effect of the ultrathin (tbt)(2)Ir(acac), and balanced self-emission process and energy transfer process between DMAC-DPS and (tbt)(2)Ir(acac), contribute to high device performance. (C) 2016 Elsevier B.V. All rights reserved.
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