Multi-resonant thermally activated delayed fluorescence emitters based on tetracoordinate boron-containing PAHs : colour tuning based on the nature of chelates
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Multi-resonant thermally activated delayed fluorescence (MR-TADF) materials have attracted considerable attention recently. The molecular design frequently incorporates cycloboration. However, to the best of our knowledge MR-TADF compounds containing nitrogen chelated to boron are still unknown. Reported herein is a new class of tetracoordinate boron-containing MR-TADF emitters bearing C^N^C- and N^N^N-chelating ligands. We demonstrate that the replacement of the B–C covalent bond in the C^N^C-chelating ligand by the B–N covalent bond affords an isomer, which dramatically influences the optoelectronic properties of the molecule. The resulting N^N^N-chelating compounds show bathochromically shifted absorption and emission spectra relative to C^N^C-chelating compounds. The incorporation of a tert-butylcarbazole group at the 4-position of the pyridine significantly enhances both the thermal stability and the reverse intersystem crossing rate, yet has a negligible effect on emission properties. Consequently, high-performance hyperfluorescent organic light-emitting diodes (HF-OLEDs) that utilize these molecules as green and yellow-green emitters show a maximum external quantum efficiency (ηext) of 11.5% and 25.1%, and a suppressed efficiency roll-off with an ηext of 10.2% and 18.7% at a luminance of 1000 cd m−2, respectively.
Meng , G , Liu , L , He , Z , Hall , D , Wang , X , Peng , T , Yin , X , Chen , P , Beljonne , D , Olivier , Y , Zysman-Colman , E , Wang , N & Wang , S 2022 , ' Multi-resonant thermally activated delayed fluorescence emitters based on tetracoordinate boron-containing PAHs : colour tuning based on the nature of chelates ' , Chemical Science , vol. Advance Article , no. 6 . https://doi.org/10.1039/d1sc05692a
Copyright © 2022 The Author(s). Open Access. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
DescriptionThe St Andrews team would like to thank the Leverhulme Trust (RPG-2016-047) and EPSRC (EP/P010482/1) for financial support. E. Z.-C. is a Royal Society Leverhulme Trust Senior Research fellow (SRF\R1\201089).
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