The Influence of Defects on the Luminescence of Trivalent Terbiumin Nanocrystalline Yttrium Orthovanadate

Autor(es)

Perrella, Rafael Vieira ; Walker, Marc ; Chamberlain, Thomas W. ; Walton, Richard, I ; de Sousa Filho, Paulo Cesar

• Tipo de documento: Artigo Científico
• Fonte: Nano Letters; v. 22, n. 9, p. 7-pg., 2022-05-11.

Resumo

Terbium-doped YVO4has been considered anonluminescent solid since thefirst classic studies on rare-earth-doped phosphors in the 1960s. However, we demonstrate thatdefect engineering of YVO4:Tb3+nanoparticles overcomes themetal-metal charge transfer (MMCT) process which is respon-sible for the quenching of the Tb3+luminescence. Tetragonal(Y1-xTbx)VO4nanoparticles obtained by colloidal precipitationshowed expanded unit cells, high defect densities, and intimatelymixed carbonates and hydroxides, which contribute to a shift of theMMCT states to higher energies. Consequently, we demonstrateunambiguously for thefirst time that Tb3+luminescence can beexcited by VO43--> Tb3+energy transfer and by direct populationof the5D4state in YVO4. We also discuss how thermal treatmentremoves these effects and shifts the quenching MMCT state tolower energies, thus highlighting the major consequences of defect density and microstructure in nanosized phosphors. Therefore,ourfindings ultimately show nanostructured YVO4:Tb3+can be reclassified as a UV-excitable luminescent material (AU)

• Processo FAPESP: 20/10518-0 - Nanopartículas inorgânicas como novas ferramentas para sensoriamento óptico em nanoescala
• Beneficiário: Paulo Cesar de Sousa Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/19909-0 - Nanopartículas luminescentes multimodais para termometria e sensoriamento de espécies reativas de oxigênio
• Beneficiário: Rafael Vieira Perrella
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/08334-9 - Novos materiais avançados para aplicações em sensoriamento: um projeto colaborativo sobre a caracterização estrutural e espectroscópica de novos sólidos à base de terras raras
• Beneficiário: Paulo Cesar de Sousa Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular