Merging boron and carbonyl based MR-TADF emitter designs to achieve high performance pure blue OLEDs
Date
10/07/2023Author
Grant ID
ep/l017008/1
EP/P010482/1
EP/P010482/1
Keywords
Metadata
Show full item recordAbstract
Multiresonant thermally activated delayed fluorescence (MR-TADF) compounds are attractive as emitters for organic light-emitting diodes (OLEDs) as they can simultaneously harvest both singlet and triplet excitons to produce light in the device and show very narrow emission spectra, which translates to excellent color purity. Here, we report the first example of an MR-TADF emitter (DOBDiKTa) that fuses together fragments from the two major classes of MR-TADF compounds, those containing boron (DOBNA) and those containing carbonyl groups (DiKTa) as acceptor fragments in the MR-TADF skeleton. The resulting molecular design, this compound shows desirable narrowband pure blue emission and efficient TADF character. The co-host OLED with DOBDiKTa as the emitter showed a maximum external quantum efficiency (EQEmax) of 17.4 %, an efficiency roll-off of 32 % at 100 cd m−2, and Commission Internationale de l’Éclairage (CIE) coordinates of (0.14, 0.12). Compared to DOBNA and DiKTa, DOBDiKTa shows higher device efficiency with reduced efficiency roll-off while maintaining a high color purity, which demonstrates the promise of the proposed molecular design.
Citation
Wu , S , Zhang , L , Wang , J , Gupta , A K , Samuel , I D W & Zysman-Colman , E 2023 , ' Merging boron and carbonyl based MR-TADF emitter designs to achieve high performance pure blue OLEDs ' , Angewandte Chemie International Edition , vol. 62 , no. 28 , e202305182 . https://doi.org/10.1002/anie.202305182
Publication
Angewandte Chemie International Edition
Status
Peer reviewed
ISSN
1433-7851Type
Journal article
Description
Funding: China Scholarship Council - 2019 06250199, 2020 06250026; Engineering and Physical Sciences Research Council - EP/L017008, EP/P010482/1.Collections
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