Enhanced NIR-I emission from water-dispersible NIR-II dye-sensitized core/active shell upconverting nanoparticles

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorHazra, Chanchal-
Autor(es): dc.creatorUllah, Sajjad-
Autor(es): dc.creatorSerge Correales, York E.-
Autor(es): dc.creatorCaetano, Laís G.-
Autor(es): dc.creatorRibeiro, Sidney J. L.-
Data de aceite: dc.date.accessioned2021-03-11T00:57:15Z-
Data de disponibilização: dc.date.available2021-03-11T00:57:15Z-
Data de envio: dc.date.issued2018-12-11-
Data de envio: dc.date.issued2018-12-11-
Data de envio: dc.date.issued2018-01-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1039/c8tc00335a-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/179839-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/179839-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionCNPq: 133105/2017-2-
Descrição: dc.descriptionProcesso FAPESP: 2015/18733-0-
Descrição: dc.descriptionProcesso FAPESP: 2015/22875-4-
Descrição: dc.descriptionRecently, there has been a surge in research studies directed towards near-infrared (NIR) dye-sensitized upconverting nanoparticles (UCNPs) as they carry the prominent advantages of a broader absorption range and enhanced upconversion efficiency. Unfortunately, however, the UCNPs combined with the native form of NIR dye are of little use for biological imaging in the NIR-I or NIR-II window as the dye- sensitization process is mostly carried out in non-aqueous media. To overcome this shortcoming, we propose to employ a water-dispersible NIR-II dye (IR-1061) to sensitize core/active shell UCNPs and achieve sufficiently high upconversion quantum efficiency in aqueous media. We have particularly focused on achieving strong NIR-I emission rather than visible upconversion emission as the latter suffers from the problem of shallow tissue penetration depth. For this purpose, Pluronic F68-encapsulated water-dispersible IR-1061 dye was coupled with polyethyleneimine (PEI)-coated NaYF4:Tm3+/Yb3+@NaYF4:Yb3+ core/active shell UCNPs. We thus achieved a 283% enhancement in NIR-I emission (i.e. 800 nm emission of Tm3+ ion) from water-dispersible NIR-II dye-sensitized core/active shell UCNPs via doping of ytterbium ions (Yb3+) in the UCNP shell, which bridged the energy transfer from the dye to the UCNP core. Practically, in comparison with the native form of the dye, this water-dispersible dye can also efficiently harvest irradiation energy, which is nonradiatively transferred to Yb3+ ions in the shell and subsequently to Yb3+ ions in the core. The latter sensitizes Tm3+ ions positioned in the core, thus generating upconversion luminescence from the UCNPs. We envision that our water-dispersible NIR-II dye-sensitized core/active shell UCNPs are not only potential candidates for a broad spectrum of photonic applications but that they will also find new opportunities in several biological applications.-
Formato: dc.format4777-4785-
Idioma: dc.languageen-
Relação: dc.relationJournal of Materials Chemistry C-
Relação: dc.relation1,917-
Direitos: dc.rightsclosedAccess-
Título: dc.titleEnhanced NIR-I emission from water-dispersible NIR-II dye-sensitized core/active shell upconverting nanoparticles-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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