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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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Bibliographic Details
Main Authors: Jürgensen, Nils (Author) , Kretzschmar, Andreas (Author) , Freudenberg, Jan (Author) , Bunz, Uwe H. F. (Author)
Format: Article (Journal)
Language:English
Published: October 23, 2017
In: Chemistry of materials
Year: 2017, Volume: 29, Issue: 21, Pages: 9154-9161
ISSN:1520-5002
DOI:10.1021/acs.chemmater.7b02964
Online Access: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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Author Notes:Nils Jürgensen, Andreas Kretzschmar, Stefan Höfle, Jan Freudenberg, Uwe H. F. Bunz, Gerardo Hernandez-Sosa
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Summary: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.
Item Description:Gesehen am 13.08.2018
Physical Description:Online Resource
ISSN:1520-5002
DOI:10.1021/acs.chemmater.7b02964

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