A boron, nitrogen, and oxygen doped π-extended helical pure blue multiresonant thermally activated delayed fluorescent emitter for organic light emitting diodes that shows fast kRISC without the use of heavy atoms
Date
18/04/2024Author
Grant ID
EP/R035164/1
EP/W007517/1
838885
Keywords
Metadata
Show full item recordAbstract
Narrowband emissive multiresonant thermally activated delayed fluorescence (MR-TADF) emitters are a promising solution to achieve the current industry-targeted color standard, Rec. BT.2020-2, for blue color without using optical filters, aiming for high-efficiency organic light-emitting diodes (OLEDs). However, their long triplet lifetimes, largely affected by their slow reverse intersystem crossing rates, adversely affect device stability. In this study, a helical MR-TADF emitter (f-DOABNA) is designed and synthesized. Owing to its π-delocalized structure, f-DOABNA possesses a small singlet-triplet gap, ΔEST, and displays simultaneously an exceptionally faster reverse intersystem crossing rate constant, kRISC, of up to 2 × 106 s−1 and a very high photoluminescence quantum yield, ΦPL, of over 90% in both solution and doped films. The OLED with f-DOABNA as the emitter achieved a narrow deep-blue emission at 445 nm (full width at half-maximum of 24 nm) associated with Commission Internationale de l'Éclairage (CIE) coordinates of (0.150, 0.041), and showed a high maximum external quantum efficiency, EQEmax, of ≈20%.
Citation
Weerasinghe , R W , Madayanad Suresh , S , Hall , D L S , Matulaitis , T , Slawin , A M Z , Warriner , S , Lee , Y-T , Chan , C-Y , Tsuchiya , Y , Zysman-Colman , E & Adachi , C 2024 , ' A boron, nitrogen, and oxygen doped π-extended helical pure blue multiresonant thermally activated delayed fluorescent emitter for organic light emitting diodes that shows fast k RISC without the use of heavy atoms ' , Advanced Materials , vol. Early View , 2402289 . https://doi.org/10.1002/adma.202402289
Publication
Advanced Materials
Status
Peer reviewed
ISSN
0935-9648Type
Journal article
Description
Funding: This work was supported financially by the JSPS Core-to-Core Program (grant number: JPJSCCA20180005), JSPS International Leading Research (ILR) (Grant No. 23K20039), JSPS Grant-in-Aid for Specially Promoted Research (Grant No. 23H05406), Kyulux Inc, and the Engineering and Physical Sciences Research Council for support (EP/R035164/1; EP/W007517/1). C.-Y.C acknowledges the support from the grant from the City University of Hong Kong (Project Nos. 9610637and 9231531). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 838885 (NarrowbandSSL). S.M.S. acknowledges support from the Marie Skłodowska-Curie Individual Fellowship (grant agreement No. 838885 NarrowbandSSL). Computational resources have been provided by the Consortium des Équipementsde Calcul Intensif (CÉCI), funded by the Fonds de la Recherche Scientifiques de Belgique (F. R. S.-FNRS) under Grant No. 2.5020.11, as well as the Tier-1 supercomputer of the Fédération Wallonie-Bruxelles, infrastructure funded by the Walloon Region under the grant agreement n1117545.Collections
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