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Use of pyrimidine and pyrazine bridges as a design strategy to improve the performance of thermally activated delayed fluorescence organic light emitting diodes
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dc.contributor.author | dos Santos, Paloma Lays | |
dc.contributor.author | Chen, Dongyang | |
dc.contributor.author | Pachai Gounder, Rajamalli | |
dc.contributor.author | Matulaitis, Tomas | |
dc.contributor.author | Cordes, David Bradford | |
dc.contributor.author | Slawin, Alexandra Martha Zoya | |
dc.contributor.author | Jacquemin, Denis | |
dc.contributor.author | Zysman-Colman, Eli | |
dc.contributor.author | Samuel, Ifor David William | |
dc.date.accessioned | 2020-11-07T00:38:31Z | |
dc.date.available | 2020-11-07T00:38:31Z | |
dc.date.issued | 2019-12-04 | |
dc.identifier | 263137548 | |
dc.identifier | 79d57162-3090-4a0b-8666-d574e889b6c2 | |
dc.identifier | 85075658963 | |
dc.identifier | 000501620700027 | |
dc.identifier.citation | dos Santos , P L , Chen , D , Pachai Gounder , R , Matulaitis , T , Cordes , D B , Slawin , A M Z , Jacquemin , D , Zysman-Colman , E & Samuel , I D W 2019 , ' Use of pyrimidine and pyrazine bridges as a design strategy to improve the performance of thermally activated delayed fluorescence organic light emitting diodes ' , ACS Applied Materials & Interfaces , vol. 11 , no. 48 , pp. 45171-45179 . https://doi.org/10.1021/acsami.9b16952 | en |
dc.identifier.issn | 1944-8244 | |
dc.identifier.other | ORCID: /0000-0002-9527-6418/work/64697454 | |
dc.identifier.other | ORCID: /0000-0002-5366-9168/work/64697468 | |
dc.identifier.other | ORCID: /0000-0001-7183-6022/work/64697941 | |
dc.identifier.other | ORCID: /0000-0003-0470-7356/work/64698150 | |
dc.identifier.other | ORCID: /0000-0001-8079-0425/work/64698266 | |
dc.identifier.uri | https://hdl.handle.net/10023/20922 | |
dc.description | Authors are grateful to the Engineering and Physical Sciences Research Council (EPSRC) for support from grants EP/P010482/1 and EP/R035164/1. P. Rajamalli acknowledges support from a Marie Skłodowska-Curie Individual Fellowship (MCIF; No. 749557). Dongyang Chen thanks the China Scholarship Council (grant numbers 201603780001). | en |
dc.description.abstract | We present a study of two isomeric thermally activated delayed fluorescence (TADF) emitters 9,9'- (sulfonylbis(pyrimidine-5,2-diyl))bis(3,6-di-tert-butyl-9H-carbazole) ( pDTCz-DPmS ) and 9,9'- (sulfonylbis(pyrazine-5,2-diyl))bis(3,6-di-tert-butyl-9H-carbazole) ( pDTCz-DPzS ). The use of pyrimidine and pyrazine as bridging units between the electron donor and acceptor moieties is found to be advantageous compared to the phenyl- (pDTCz-DPS) and pyridine-based analogues ( pDTCz-3DPyS and pDTCz-2DPyS ). Conformational modulation of the donor groups as a function of the bridge results in high photoluminescence quantum yields (ΦPL > 68%) and small energy gaps between singlet and triplet excited states (ΔEST < 160 meV). OLEDs using pDTCz-DPmS and pDTCz-DPzS as emitters exhibit blue and green electroluminescence, respectively, with higher maximum external quantum efficiencies (EQEmax of 14% and 18%, respectively) and reduced efficiency roll-off as compared to the reference devices using pDTCz-DPS , pDTCz-3DPyS , and pDTCz-2DPyS as the emitters. Our results provide a more complete understanding on the impact of the bridge structure in D-A-D TADF systems on the optoelectronic properties of the emitter, and how the balance between color purity and EQE in the devices can be controlled, advancing the design strategies for TADF emitters. | |
dc.format.extent | 1154842 | |
dc.language.iso | eng | |
dc.relation.ispartof | ACS Applied Materials & Interfaces | en |
dc.subject | TADF | en |
dc.subject | Organic light emitting diodes | en |
dc.subject | Pyrimidine | en |
dc.subject | Pyrazine | en |
dc.subject | Blue OLED | en |
dc.subject | Intramolecular hydrogen bond | en |
dc.subject | QD Chemistry | en |
dc.subject | DAS | en |
dc.subject.lcc | QD | en |
dc.title | Use of pyrimidine and pyrazine bridges as a design strategy to improve the performance of thermally activated delayed fluorescence organic light emitting diodes | en |
dc.type | Journal article | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.sponsor | European Commission | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. Organic Semiconductor Centre | en |
dc.contributor.institution | University of St Andrews. School of Chemistry | en |
dc.contributor.institution | University of St Andrews. EaSTCHEM | 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 | 10.1021/acsami.9b16952 | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2020-11-07 | |
dc.identifier.grantnumber | EP/P010482/1 | en |
dc.identifier.grantnumber | EP/R035164/1 | en |
dc.identifier.grantnumber | 749557 | en |
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