1. Highly twisted α-diketone-based thermally activated delayed fluorescence emitters and their use in organic light-emitting diodes
- Author
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Eli Zysman-Colman, Tomas Matulaitis, Ifor D. W. Samuel, David B. Cordes, Alexandra M. Z. Slawin, Abhishek Gupta, Scottish Funding Council, The Royal Society, EPSRC, University of St Andrews. School of Chemistry, University of St Andrews. EaSTCHEM, University of St Andrews. Centre for Biophotonics, University of St Andrews. Condensed Matter Physics, and University of St Andrews. School of Physics and Astronomy
- Subjects
TADF ,Red-shift emission ,Materials science ,Electroluminescence ,Photochemistry ,Catalysis ,chemistry.chemical_compound ,OLED ,QD ,Common emitter ,Diketone ,business.industry ,Chemistry ,OLEDs ,Doping ,Organic Chemistry ,DAS ,General Chemistry ,α-diketone ,QD Chemistry ,Acceptor ,Fluorescence ,Optoelectronics ,Quantum efficiency ,business ,Phenoxazine - Abstract
AKG is grateful to the Royal Society for Newton International Fellowship NF171163. We acknowledge support from the Engineering and Physical Sciences Research Council of the UK (grants EP/P010482/1 and EP/L017008/1). We are also grateful for financial support from the University of St Andrews Restarting Research and Restarting Interdisciplinary Research Funding Schemes (SARRF and SARIRF) which are funded through the Scottish Funding Council grant reference SFC/AN/08/020. We have designed a highly twisted small TADF emitter PXZ-α-DK based on an a-diketone (α-DK) as a strong acceptor and phenoxazine (PXZ) as a strong donor to obtain red-shifted emission in comparison to the equivalent a-diketone linked to 9,9-dimethyl-9,10-dihydroacridine (DMAC). The PXZ-α-DK shows emission at 586 nm and DMAC-α-DK shows emission at 548 nm in 1,3-bis(N-carbazolyl)benzene (mCP) host at 1.5 wt% doping of the emitter, with short-delayed lifetimes of 6.9 μs for PXZ-α-DK and 7.6 μs for DMAC-α-DK. OLEDs fabricated using these emitters show green electroluminescence at 555 nm for DMAC-α-DK, with a maximum external quantum efficiency, EQEmax, of 6.3%, and orange electroluminescence at 585 nm for PXZ-α-DK, with an EQEmax of 0.8%. We corroborate the optoelectronic properties of these emitters with DFT calculations. Postprint
- Published
- 2022
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