Sulfone-based deep blue thermally activated delayed fluorescence emitters

• Verfasst von: Jürgensen, Nils [VerfasserIn]
• Verfasst von: Kretzschmar, Andreas [VerfasserIn]
• Verfasst von: Freudenberg, Jan [VerfasserIn]
• Verfasst von: Bunz, Uwe H. F. [VerfasserIn]
• Titel: Sulfone-based deep blue thermally activated delayed fluorescence emitters
• Titelzusatz: solution-processed organic light-emitting diodes with high efficiency and brightness
• Verf.angabe: Nils Jürgensen, Andreas Kretzschmar, Stefan Höfle, Jan Freudenberg, Uwe H. F. Bunz, Gerardo Hernandez-Sosa
• Umfang: 8 S.
• Fussnoten: Gesehen am 13.08.2018
• Titel Quelle: Enthalten in: Chemistry of materials
• Jahr Quelle: 2017
• Band/Heft Quelle: 29(2017), 21, S. 9154-9161
• ISSN Quelle: 1520-5002
• DOI: doi:10.1021/acs.chemmater.7b02964
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1578532590

Abstract

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 coordinateslow as CIEy = 0.08.