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dc.contributor.authorLi, Wenbo
dc.contributor.authorLi, Zhaoning
dc.contributor.authorSi, Changfeng
dc.contributor.authorWong, Michael Yin
dc.contributor.authorJinnai, Kazuya
dc.contributor.authorGupta, Abhishek Kumar
dc.contributor.authorKabe, Ryota
dc.contributor.authorAdachi, Chihaya
dc.contributor.authorHuang, Wei
dc.contributor.authorZysman-Colman, Eli
dc.contributor.authorSamuel, Ifor David William
dc.date.accessioned2020-10-08T10:30:05Z
dc.date.available2020-10-08T10:30:05Z
dc.date.issued2020-11-10
dc.identifier.citationLi , W , Li , Z , Si , C , Wong , M Y , Jinnai , K , Gupta , A K , Kabe , R , Adachi , C , Huang , W , Zysman-Colman , E & Samuel , I D W 2020 , ' Organic long persistent luminescence from a thermally activated delayed fluorescence compound ' , Advanced Materials , vol. 32 , no. 45 , 2003911 . https://doi.org/10.1002/adma.202003911en
dc.identifier.issn0935-9648
dc.identifier.otherPURE: 270005768
dc.identifier.otherPURE UUID: 65b8beff-c6d0-4dde-9d4c-9cdf1ca1aef8
dc.identifier.otherORCID: /0000-0001-7183-6022/work/81797763
dc.identifier.otherWOS: 000575811400001
dc.identifier.otherScopus: 85092134701
dc.identifier.urihttp://hdl.handle.net/10023/20743
dc.descriptionFunding: UK EPSRC (grants EP/ P010482/1, EP/J01771X, EP/J00916, and EP/R035164/1). We gratefully acknowledge funding through the EPSRC NSFCBET lead agency agreement (EP/R010595/1,1706207) and a Leverhulme Trust Research Grant (RPG-2017-231).en
dc.description.abstractOrganic long‐persistent luminescence (OLPL) is one of the most promising methods for long‐lived‐emission applications. However, present room‐temperature OLPL emitters are mainly based on a bimolecular exciplex system which usually needs an expensive small molecule such as 2,8‐bis(diphenyl‐phosphoryl)dibenzo[b,d]thiophene (PPT) as the acceptor. In this study, a new thermally activated delayed fluorescence (TADF) compound, 3‐(4‐(9H‐carbazol‐9‐yl)phenyl)acenaphtho[1,2‐b]pyrazine‐8,9‐dicarbonitrile (CzPhAP), is designed, which also shows OLPL in many well‐known hosts such as PPT, 2,2′,2″‐(1,3,5‐benzinetriyl)‐tris(1‐phenyl‐1‐H‐benzimidazole) (TPBi), and poly(methyl methacrylate) (PMMA), without any exciplex formation, and its OLPL duration reaches more than 1 h at room temperature. Combining the low cost of PMMA manufacture and flexible designs of TADF molecules, pure organic, large‐scale, color tunable, and low‐cost room‐temperature OLPL applications become possible. Moreover, it is found that the onset of the 77 K afterglow spectra from a TADF‐emitter‐doped film is not necessarily reliable for determining the lowest triplet state energy level. This is because in some TADF‐emitter‐doped films, optical excitation can generate charges (electron and holes) that can later recombine to form singlet excitons during the phosphorescence spectrum measurement. The spectrum taken in the phosphorescence time window at low temperature may consequently consist of both singlet and triplet emission.
dc.format.extent9
dc.language.isoeng
dc.relation.ispartofAdvanced Materialsen
dc.rightsCopyright © 2020 The Authors. Published by Wiley‐VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.subjectAfterglowen
dc.subjectCharge recombinationen
dc.subjectCharge separationen
dc.subjectLong-persistent luminescence (LPL)en
dc.subjectOrganic long-persistent luminescence (OLPL)en
dc.subjectThermally activated delayed fluorescence (TADF)en
dc.subjectQC Physicsen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.subjectDASen
dc.subject.lccQCen
dc.subject.lccTKen
dc.titleOrganic long persistent luminescence from a thermally activated delayed fluorescence compounden
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.School of Chemistryen
dc.contributor.institutionUniversity of St Andrews.Centre for Biophotonicsen
dc.contributor.institutionUniversity of St Andrews.Condensed Matter Physicsen
dc.contributor.institutionUniversity of St Andrews.EaSTCHEMen
dc.identifier.doihttps://doi.org/10.1002/adma.202003911
dc.description.statusPeer revieweden


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