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dc.contributor.authordos Santos, Paloma Lays
dc.contributor.authorChen, Dongyang
dc.contributor.authorPachai Gounder, Rajamalli
dc.contributor.authorMatulaitis, Tomas
dc.contributor.authorCordes, David Bradford
dc.contributor.authorSlawin, Alexandra Martha Zoya
dc.contributor.authorJacquemin, Denis
dc.contributor.authorZysman-Colman, Eli
dc.contributor.authorSamuel, Ifor David William
dc.date.accessioned2020-11-07T00:38:31Z
dc.date.available2020-11-07T00:38:31Z
dc.date.issued2019-12-04
dc.identifier263137548
dc.identifier79d57162-3090-4a0b-8666-d574e889b6c2
dc.identifier85075658963
dc.identifier000501620700027
dc.identifier.citationdos 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.9b16952en
dc.identifier.issn1944-8244
dc.identifier.otherORCID: /0000-0002-9527-6418/work/64697454
dc.identifier.otherORCID: /0000-0002-5366-9168/work/64697468
dc.identifier.otherORCID: /0000-0001-7183-6022/work/64697941
dc.identifier.otherORCID: /0000-0003-0470-7356/work/64698150
dc.identifier.otherORCID: /0000-0001-8079-0425/work/64698266
dc.identifier.urihttps://hdl.handle.net/10023/20922
dc.descriptionAuthors 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.abstractWe 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.extent1154842
dc.language.isoeng
dc.relation.ispartofACS Applied Materials & Interfacesen
dc.subjectTADFen
dc.subjectOrganic light emitting diodesen
dc.subjectPyrimidineen
dc.subjectPyrazineen
dc.subjectBlue OLEDen
dc.subjectIntramolecular hydrogen bonden
dc.subjectQD Chemistryen
dc.subjectDASen
dc.subject.lccQDen
dc.titleUse of pyrimidine and pyrazine bridges as a design strategy to improve the performance of thermally activated delayed fluorescence organic light emitting diodesen
dc.typeJournal articleen
dc.contributor.sponsorEPSRCen
dc.contributor.sponsorEPSRCen
dc.contributor.sponsorEuropean Commissionen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Organic Semiconductor Centreen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.contributor.institutionUniversity of St Andrews. EaSTCHEMen
dc.contributor.institutionUniversity of St Andrews. Centre for Biophotonicsen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.identifier.doi10.1021/acsami.9b16952
dc.description.statusPeer revieweden
dc.date.embargoedUntil2020-11-07
dc.identifier.grantnumberEP/P010482/1en
dc.identifier.grantnumberEP/R035164/1en
dc.identifier.grantnumber749557en


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