Sulfone-based deep blue thermally activated delayed fluorescence emitters: solution-processed organic light-emitting diodes with high efficiency and brightness
Low efficiencies of soluble blue emitter materials remain a major issue in the development of printed organic light-emitting devices. n-Alkylated carbazoles or sterically demanding ortho-substituted diphenylamines were employed as donor elements to increase solubility and to preserve blue emission o...
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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
October 23, 2017
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| In: |
Chemistry of materials
Year: 2017, Jahrgang: 29, Heft: 21, Pages: 9154-9161 |
| ISSN: | 1520-5002 |
| DOI: | 10.1021/acs.chemmater.7b02964 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1021/acs.chemmater.7b02964 Verlag, Volltext: https://doi.org/10.1021/acs.chemmater.7b02964 
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| Verfasserangaben: | Nils Jürgensen, Andreas Kretzschmar, Stefan Höfle, Jan Freudenberg, Uwe H. F. Bunz, Gerardo Hernandez-Sosa |
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| 520 | |a Low efficiencies of soluble blue emitter materials remain a major issue in the development of printed organic light-emitting devices. n-Alkylated carbazoles or sterically demanding ortho-substituted diphenylamines were employed as donor elements to increase solubility and to preserve blue emission of thermally activated delayed fluorescence (TADF) donor-acceptor-donor emitters employing a p-bis(phenylsulfonyl)benzene acceptor described in the literature. The soluble molecules exhibited increased steric hindrance of the amine donors and a small ΔEST as low as 0.32 eV. Thermally activated delayed fluorescence occurs, and photoluminescence quantum yields of ≤82% were achieved. Application of these TADF molecules in solution-processed organic light-emitting diodes resulted in high brightnesses of ≤10000 cd/m2, current efficiencies of ≤9.5 cd/A, and external quantum efficiencies of ≤8.5%, while retaining deep blue emission ranging from 466 to 436 nm with color coordinates low as CIEy = 0.08. | ||
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