DataVXAdvanced Optical MaterialsPaper
journal article·2025-12Open access

Exploring the Impact of the Presence of 9,9′‐Spirobifluorene Moieties on the Performance of Carbonyl‐Based Multiresonant Thermally Activated Delayed Fluorescence Organic Light‐Emitting Diodes

Janine Haug, Sen Wu, Hassan Hafeez, Maximilian Schustek, Mahni Fatahi, Yannik T. Woordes, Martin Nieger, Olaf Fuhr, Burkhard Luy, Ifor D.W. Samuel, Stefan Bräse, Eli Zysman‐Colman

Advanced Optical Materials· Volume 13· Issue 36
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Source abstract

Abstract

Abstract The impact of the decoration of the multiresonant thermally activated delayed fluorescence (MR‐TADF) core DiKTa with 9,9′‐spirobifluorene (SBF) groups is investigated with respect to the impact of number, position, and incorporation‐type of the SBF unit on the photophysical and optoelectronic properties. This approach allows for the development of narrowband, high‐efficiency organic light emitting diodes (OLEDs) with moderate efficiency roll‐off. The MR‐TADF emitters DiKTaSBF , 3‐SBF‐DiKTa , 7‐SBF‐DiKTa , and 7‐SBF‐DiKTaSBF , differ in the number, position, and incorporation‐type of the SBF unit. Sky‐blue OLEDs with DiKTaSBF and 3‐SBF‐DiKTa show superior performance with maximal external quantum efficiencies (EQE max ) of 26.1 and 27.0%, respectively, while all four families of OLEDs show a moderate efficiency roll‐off. Narrowband emissions with full‐width at half maximum (FWHM) of 32 and 35 nm are observed for 7‐modified emitters, whereas for the devices with emitters containing SBF groups at the 3‐position show a broadened emission, with FWHM of ≈50 nm. These findings highlight the effect of the regiochemistry of the SBF group on the optoelectronic properties and the corresponding impact on the performance of the OLEDs.
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Research context

Electronic materials

OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Biological and Chemical Systems ‐ Functional Molecular Systems Karlsruhe Institute of Technology (KIT) Kaiserstrasse 12 76131 Karlsruhe Germany

Institute of Organic Chemistry Karlsruhe Institute of Technology (KIT) Kaiserstrasse 12 76131 Karlsruhe Germany

Organic Semiconductor Centre, EaStCHEM School of Chemistry University of St Andrews St Andrews Fife KY16 9ST UK

Organic Semiconductor Centre, SUPA School of Physics and Astronomy University of St Andrews St Andrews Fife KY16 9SS UK

Institute for Biological Interfaces 4 – Magnetic Resonance Karlsruhe Institute of Technology (KIT) Kaiserstrasse 12 76131 Karlsruhe Germany

Department of Chemistry University of Helsinki P. O. Box 55 (A. I. Virtasen aukio 1) Helsinki 00014 Finland

Institute of Nanotechnology (INT) and Karlsruhe Nano‐Micro Facility (KNMFi) Karlsruhe Institute of Technology (KIT) Kaiserstrasse 12 76131 Karlsruhe Germany

Funding

China Scholarship Council · Engineering and Physical Sciences Research Council · HORIZON EUROPE Framework Programme · Deutsche Forschungsgemeinschaft

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