Delayed fluorescence by triplet−triplet annihilation from columnar liquid crystal films.

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dc.contributor.authorFranca, Larissa Gomes
dc.contributor.authorSantos, Paloma Lays dos
dc.contributor.authorPander, Piotr
dc.contributor.authorCabral, Marília Gabriela Belarmino
dc.contributor.authorCristiano, Rodrigo
dc.contributor.authorCazati, Thiago
dc.contributor.authorMonkman, Andrew P.
dc.contributor.authorBock, Harald
dc.contributor.authorEccher, Juliana
dc.date.accessioned2023-08-18T19:14:53Z
dc.date.available2023-08-18T19:14:53Z
dc.date.issued2022pt_BR
dc.description.abstractDelayed fluorescence (DF) by triplet−triplet annihila- tion (TTA) is observed in solutions of a benzoperylene-imidoester mesogen that shows a hexagonal columnar mesophase at room temperature in the neat state. A similar benzoperylene-imide with a slightly smaller HOMO−LUMO gap, that also is hexagonal columnar liquid crystalline at room temperature, does not show DF in solution, and mixtures of the two mesogens show no DF in solution either, because of collisional quenching of the excited triplet states on the imidoester by the imide. In contrast, DF by TTA from the imide but not from the imidoester is observed in condensed films of such mixtures, even though neat films of either single material are not displaying DF. In contrast to the DF from the monomeric imidoester in solution, DF of the imide occurs from dimeric aggregates in the blend films, assisted by the imidoester. Thus, the close contact of intimately stacked molecules of the two different species in the columnar mesophase leads to a unique mesophase-assisted aggregate DF. This constitutes the first observation of DF by TTA from the columnar liquid crystalline state. If the imide is dispersed in films of polybromostyrene, which provides an external heavy-atom effect facilitating triplet formation, DF is also observed. Organic light-emitting diodes (OLEDs) devices incorporating these liquid crystal molecules demonstrated high external quantum efficiency (EQE). On the basis of the literature and to the best of our knowledge, the EQE reported is the highest among nondoped solution-processed OLED devices using a columnar liquid crystal molecule as the emitting layer.pt_BR
dc.identifier.citationFRANCA, L. G. et al. Delayed fluorescence by triplet−triplet annihilation from columnar liquid crystal films. ACS Applied Electronic Materials, v. 4, p. 3486−3494, 2022. Disponível em: <https://pubs.acs.org/doi/10.1021/acsaelm.2c00432>. Acesso em: 06 jul. 2023.pt_BR
dc.identifier.doihttps://doi.org/10.1021/acsaelm.2c00432pt_BR
dc.identifier.issn2637-6113
dc.identifier.urihttp://www.repositorio.ufop.br/jspui/handle/123456789/17262
dc.language.isoen_USpt_BR
dc.rightsabertopt_BR
dc.rights.licenseThis article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. Fonte: PDF do artigo.pt_BR
dc.subjectOptical spectroscopypt_BR
dc.subjectSolution-processed OLEDpt_BR
dc.titleDelayed fluorescence by triplet−triplet annihilation from columnar liquid crystal films.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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