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dc.contributor.authorMoon, Chang-Ki
dc.contributor.authorButscher, Julian F.
dc.contributor.authorGather, Malte C.
dc.identifier.citationMoon , C-K , Butscher , J F & Gather , M C 2023 , ' An exciplex-based light-emission pathway for solution-state electrochemiluminescent devices ' , Advanced Materials , vol. 35 , no. 38 , 2302544 .
dc.identifier.otherRIS: urn:4C048A2DB0D8DA04D543E6EAEC2F2EC5
dc.identifier.otherORCID: /0000-0002-4857-5562/work/139554574
dc.descriptionThis work was financially supported by the Alexander von Humboldt Foundation (Humboldt-Professorship to M.C.G.). C.K.M. acknowledges funding from the European Commission through a Marie Skłodowska Curie individual fellowship (101029807). J.F.B. acknowledges funding from Beverly and Frank MacInnis via the University of St Andrews.en
dc.description.abstractElectrochemiluminescence (ECL) allows the design of unique light-emitting devices that use organic semiconductors in a liquid or gel state, which allows for simpler and more sustainable device fabrication and facilitates unconventional device form-factors. Compared to solid-state organic LEDs, ECL devices (ECLDs) have attracted less attention due to their currently much lower performance. ECLD operation is typically based on an annihilation pathway that involves electron transfer between reduced and oxidized luminophore species; the intermediate radical ions produced during annihilation dramatically reduce device stability. Here, the effects of radical ions are mitigated by an exciplex formation pathway and a remarkable improvement in luminance, luminous efficacy, and operational lifetime is demonstrated. Electron donor and acceptor molecules are dissolved at high concentrations and recombined as an exciplex upon their oxidization/reduction. The exciplex then transfers its energy to a nearby dye, allowing the dye to emit light without undergoing oxidation/reduction. Furthermore, the application of a mesoporous TiO2 electrode increases the contact area and hence the number of molecules participating in ECL , thereby obtaining devices with a very high luminance of 3790 cd m−2 and a 30-fold improved operational lifetime. This study paves the way for the development of ECLDs into highly versatile light sources.
dc.relation.ispartofAdvanced Materialsen
dc.subjectAC operationen
dc.subjectElectrochemiluminescent deviceen
dc.subjectOrganic semiconductorsen
dc.subjectPhotonic devicesen
dc.subjectTiO2 electrodeen
dc.subjectQC Physicsen
dc.titleAn exciplex-based light-emission pathway for solution-state electrochemiluminescent devicesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Sir James Mackenzie Institute for Early Diagnosisen
dc.contributor.institutionUniversity of St Andrews. Centre for Biophotonicsen
dc.contributor.institutionUniversity of St Andrews. Institute of Behavioural and Neural Sciencesen
dc.contributor.institutionUniversity of St Andrews. Biomedical Sciences Research Complexen
dc.description.statusPeer revieweden

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