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Dipole reorientation and local density of optical states influence the emission of light-emittingelectrochemical cells

AuthorsJiménez-Solano, Alberto CSIC ORCID; Martínez-Sarti, Laura; Pertegás, Antonio; Lozano, Gabriel CSIC ORCID; Bolink, Henk J.; Míguez, Hernán CSIC ORCID
Issue Date7-Jan-2020
PublisherRoyal Society of Chemistry (UK)
CitationPhysical Chemistry Chemical Physics 22(1): 92-96 (2020)
AbstractHerein, we analyze the temporal evolution of the electroluminescence of light-emitting electrochemicalcells (LECs), a thin-film light-emitting device, in order to maximize the luminous power radiated bythese devices. A careful analysis of the spectral and angular distribution of the emission of LECsfabricated under the same experimental conditions allows describing the dynamics of the spatial regionfrom which LECs emit,i.e.the generation zone, as bias is applied. This effect is mediated by dipolereorientation within such an emissive region and its optical environment, since its spatial drift yields adifferent interplay between the intrinsic emission of the emitters and the local density of optical states ofthe system. Our results demonstrate that engineering the optical environment in thin-film light-emittingdevices is key to maximize their brightness
Publisher version (URL)
Identifiersdoi: 10.1039/C9CP05505C
issn: 1463-9076
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