Construction and performance of OLED devices prepared from liquid-crystalline TADF materials

The device performance is reported for three compounds which show both thermally activated delayed fluorescence and liquid crystallinity, and use the donor 3,6-bis(3,4-didodecyloxyphenyl)carbazole. Two of the compounds, whose photophysics were reported previously, are based on a terephthalonitrile a...

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Veröffentlicht in:Physical chemistry chemical physics : PCCP 2022-09, Vol.24 (36), p.22115-22121
Hauptverfasser: Suleymanova, Alfiya F, Shafikov, Marsel Z, Chen, Xinrui, Wang, Yafei, Czerwieniec, Rafal, Bruce, Duncan W
Format: Artikel
Sprache:eng
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Zusammenfassung:The device performance is reported for three compounds which show both thermally activated delayed fluorescence and liquid crystallinity, and use the donor 3,6-bis(3,4-didodecyloxyphenyl)carbazole. Two of the compounds, whose photophysics were reported previously, are based on a terephthalonitrile acceptor. A third and new compound is based on an isophthalonitrile acceptor and shows a more temperature-accessible mesophase and enhanced solution emission quantum yield. Two of the compounds show device external quantum efficiencies of between 2-3% and exhibit very small efficiency roll off. The responses are evaluated in terms of the specific nature of the materials. Emissive liquid-crystalline phthalonitrile carbazole conjugates showing low roll-off in OLED devices.
ISSN:1463-9076
1463-9084
DOI:10.1039/d2cp02684h