Mixed-host engineering of blue thermally activated delayed fluorescence devices for enhanced efficiency and suppressed efficiency roll-off
- Authors
- Park, S.J.; Choi, K.W.; Park, Y.W.; Ju, B.-K.
- Issue Date
- 3월-2021
- Publisher
- Elsevier B.V.
- Keywords
- Blue organic light-emitting diodes (OLEDs); Capacitance–voltage; Mixed-host; Recombination zone; Thermally activated delayed fluorescence (TADF)
- Citation
- Optical Materials, v.113
- Indexed
- SCIE
SCOPUS
- Journal Title
- Optical Materials
- Volume
- 113
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/129150
- DOI
- 10.1016/j.optmat.2021.110879
- ISSN
- 0925-3467
- Abstract
- Blue thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) with enhanced efficiency and suppressed efficiency roll-offs were fabricated using a mixed host consisting of 3,3-di(9H-carbazol-9-yl)-biphenyl (mCBP) and bis[2-(diphenyl-phosphino)phenyl]ether oxide (DPEPO). Notably, mCBP and DPEPO, which are generally used as hosts in blue TADF OLEDs, exhibit material stability and efficiency as their trade-off characteristics. The mixed-host structure, when applied to 10,10′-(4,4′-sulfonylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine), which is a blue TADF dopant, facilitated a maximum efficiency of 18.1%. Furthermore, the critical current density (J0), at which the external quantum efficiency decreases by half of its maximum value, was observed to be 3.9 times that of the DPEPO device. © 2021 Elsevier B.V.
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