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Improving processability and efficiency of Resonant TADF emitters : a design strategy
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dc.contributor.author | Hall, David | |
dc.contributor.author | Madayanad Suresh, Subeesh | |
dc.contributor.author | dos Santos, Paloma Lays | |
dc.contributor.author | Duda, Eimantas | |
dc.contributor.author | Bagnich, Sergey | |
dc.contributor.author | Pershin, Anton | |
dc.contributor.author | Pachai Gounder, Rajamalli | |
dc.contributor.author | Cordes, David Bradford | |
dc.contributor.author | Slawin, Alexandra Martha Zoya | |
dc.contributor.author | Belijonne, David | |
dc.contributor.author | Köhler, Anna | |
dc.contributor.author | Samuel, Ifor David William | |
dc.contributor.author | Olivier, Yoann | |
dc.contributor.author | Zysman-Colman, Eli | |
dc.date.accessioned | 2019-12-04T12:30:17Z | |
dc.date.available | 2019-12-04T12:30:17Z | |
dc.date.issued | 2019-12-03 | |
dc.identifier | 262232382 | |
dc.identifier | 871874a1-881d-4988-afb8-52a1db4196f2 | |
dc.identifier | 85076107915 | |
dc.identifier | 000500297000001 | |
dc.identifier.citation | Hall , D , Madayanad Suresh , S , dos Santos , P L , Duda , E , Bagnich , S , Pershin , A , Pachai Gounder , R , Cordes , D B , Slawin , A M Z , Belijonne , D , Köhler , A , Samuel , I D W , Olivier , Y & Zysman-Colman , E 2019 , ' Improving processability and efficiency of Resonant TADF emitters : a design strategy ' , Advanced Optical Materials , vol. Early View , 1901627 . https://doi.org/10.1002/adom.201901627 | en |
dc.identifier.issn | 2195-1071 | |
dc.identifier.other | ORCID: /0000-0002-9527-6418/work/65702388 | |
dc.identifier.other | ORCID: /0000-0002-5366-9168/work/65702469 | |
dc.identifier.other | ORCID: /0000-0001-7183-6022/work/65702620 | |
dc.identifier.other | ORCID: /0000-0001-8079-0425/work/65702683 | |
dc.identifier.uri | https://hdl.handle.net/10023/19066 | |
dc.description | This work is funded by the EC through the Horizon 2020 Marie Sklodowska-Curie ITN project TADFlife. The St Andrews team would also like to thank the Leverhulme Trust (RPG-2016- 047) and EPSRC (EP/P010482/1) for financial support. Computational resources have been provided by the Consortium des Équipements de 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. AP acknowledges the financial support from the Marie Curie Fellowship (MILORD project, N°. 748042). DB is a FNRS Research Director. We thank Franck-Julian Kahle for support with data analysis. | en |
dc.description.abstract | A new design strategy is introduced to address a persistent weakness with resonance thermally activated delayed fluorescence (R-TADF) emitters to reduce aggregation-caused quenching effects, which we identify as one of the key limiting factors. The emitter Mes3DiKTa shows an improved photoluminescence quantum yield of 80% compared to 75% for the reference DiKTa in 3.5 wt% mCP. Importantly, emission from aggregates, even at high doping concentrations, is eliminated and aggregation-caused quenching is strongly curtailed. For both molecules, triplets are almost quantitatively upconverted into singlets in electroluminescence, despite a significant (~0.21 eV) singlet-triplet energy gap (ΔEST), in line with correlated quantum-chemical calculations, and a slow reverse intersystem crossing. We speculate that the lattice stiffness responsible for the narrow fluorescence and phosphorescence emission spectra also protects the triplets against non-radiative decay. An improved EQEmax of 21.1% for Mes3DIKTa compared to the parent DiKTa (14.7%) and, importantly, reduced efficiency roll- off compared to literature resonance TADF OLEDs, shows the promise of this design strategy for future design of R-TADF emitters for OLED applications. | |
dc.format.extent | 2767353 | |
dc.language.iso | eng | |
dc.relation.ispartof | Advanced Optical Materials | en |
dc.subject | Blue emission | en |
dc.subject | Multiresonance thermally activated delayed fluorescence | en |
dc.subject | Organic light emitting diodes | en |
dc.subject | SCS-CC2 approach | en |
dc.subject | QD Chemistry | en |
dc.subject | DAS | en |
dc.subject.lcc | QD | en |
dc.title | Improving processability and efficiency of Resonant TADF emitters : a design strategy | en |
dc.type | Journal article | en |
dc.contributor.sponsor | European Commission | en |
dc.contributor.sponsor | The Leverhulme Trust | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.institution | University of St Andrews. School of Chemistry | en |
dc.contributor.institution | University of St Andrews. Organic Semiconductor Centre | en |
dc.contributor.institution | University of St Andrews. EaSTCHEM | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. Centre for Biophotonics | en |
dc.contributor.institution | University of St Andrews. Condensed Matter Physics | en |
dc.identifier.doi | https://doi.org/10.1002/adom.201901627 | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2019-12-03 | |
dc.identifier.grantnumber | 812872 | en |
dc.identifier.grantnumber | RPG-2016-047 | en |
dc.identifier.grantnumber | EP/P010482/1 | en |
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