Organic long persistent luminescence from a thermally activated delayed fluorescence compound
MetadataShow full item record
Organic 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.
Li , 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.202003911
Copyright © 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.
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).
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Showing items related by title, author, creator and subject.
Sanz Camacho, Paula; Athukorala Arachchige, Kasun Sankalpa; Slawin, Alexandra Martha Zoya; Green, Timothy F.G.; Yates, Jonathan R.; Dawson, Daniel McLean; Woollins, J Derek; Ashbrook, Sharon Elizabeth (2015-05-20) - Journal articleSolid-state NMR spectra of new P–Se heterocycles based on peri-substituted naphthalene motifs show the presence of unusual J couplings between Se and P. These couplings are between atoms in adjacent molecules and occur ...
Controlling the electromagnetic proximity effect by tuning the mixing between superconducting and ferromagnetic order Stewart, R.; Flokstra, M. G.; Rogers, M.; Satchell, N.; Burnell, G.; Miller, D.; Luetkens, H.; Prokscha, T.; Suter, A.; Morenzoni, E.; Lee, S. L. (2019-07-12) - Journal articleWe present low-energy muon-spin rotation measurements on Cu/Nb/AlOx/Co thin films that probe the newly described electromagnetic (EM) proximity effect. By varying the thickness of the insulating AlOx layer we control the ...
High-resolution solid-state 13C NMR spectroscopy of the paramagnetic metal-organic frameworks, STAM-1 and HKUST-1 Dawson, Daniel M.; Jamieson, Lauren E.; Mohideen, M. Infas H.; McKinlay, Alistair C.; Smellie, Iain A.; Cadou, Romain; Keddie, Neil S.; Morris, Russell E.; Ashbrook, Sharon E. (2012-11) - Journal articleSolid-state C-13 magic-angle spinning (MAS) NMR spectroscopy is used to investigate the structure of the Cu(II)-based metal-organic frameworks (MOFs), HKUST-1 and STAM-1, and the structural changes occurring within these ...