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Contribution of TADF and exciplex emission for efficient "warm-white" OLEDs
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2018 (English)In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 6, no 6, p. 1543-1550Article in journal (Refereed) Published
Abstract [en]

The bicarbazole derivative 4,4'-(9H, 9'H-[3,3'-bicarbazole]-9,9'-diyl) bis(3-(trifluoromethyl) benzonitrile), denoted as pCNBCzoCF(3), was synthesized and tested for white OLED applications. pCNBCzoCF3 demonstrated an extremely small value of the singlet-triplet energy gap that caused intensive thermally activated delayed fluorescence (TADF). In addition, this compound is able to form exciplex-type excited states at the interface with star-shaped 4,40,400-tris[phenyl(m-tolyl) amino] triphenylamine (m-MTDATA). Combining the TADF emission of pCNBCzoCF3 with the exciplex emission from the pCNBCzoCF(3) m-MTDATA interface, we fabricated a number of highly efficient "warm-white'' OLEDs, the electroluminescence of which was close to candle emission. The best device demonstrated a very high brightness of 40 900 Cd m(-2) (at 15 V), current efficiency of 53.8 Cd A(-1) and power efficiency of 19.3 lm W-1, while the external quantum efficiency reached 18.8%. The fabricated devices demonstrated high emission characteristics even for the standard test at 1000 Cd m(-2) (current efficiency of 46.2 Cd A(-1), power efficiency of 10.6 lm W-1, EQE of 17.0%).

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018. Vol. 6, no 6, p. 1543-1550
Keywords [en]
Light-Emitting-Diodes, Activated Delayed Fluorescence, Highly Efficient, Host Material, Derivatives, Carbazole, Electroluminescence, Enhancement, Conversion, Mechanism
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-223495DOI: 10.1039/c7tc05392dISI: 000424652000032Scopus ID: 2-s2.0-85041723510OAI: oai:DiVA.org:kth-223495DiVA, id: diva2:1185228
Funder
EU, Horizon 2020, ICT29-2014 641725Swedish National Infrastructure for Computing (SNIC), SNIC 020/11-23EU, FP7, Seventh Framework Programme, PIRSES-GA-2013-612670
Note

QC 20180223

Available from: 2018-02-23 Created: 2018-02-23 Last updated: 2018-02-23Bibliographically approved

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Baryshnikov, Gleb V.Minaev, Boris F.

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