Synthesis and Luminescent Properties of REVO4-REPO4 (RE = Y, Eu, Gd, Er, Tm, or Yb) Heteronanostructures: A Promising Class of Phosphors for Excitation from NIR to VUV

Autor(es)

de Sousa Filho, Paulo C. ^{[1, 2]} ; Gacoin, Thierry ^[2] ; Boilot, Jean-Pierre ^[2] ; Walton, Richard I. ^[3] ; Serra, Osvaldo A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Chem, Rare Earth Lab, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] Univ Paris Saclay, Ecole Polytech, Lab Phys Mat Condensee, Solid State Chem Grp, F-91128 Palaiseau - France

^[3] Univ Warwick, Dept Chem, Coventry CV4 7AL, W Midlands - England

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry C; v. 119, n. 42, p. 24062-24074, OCT 22 2015.
• Citações Web of Science: 26

Resumo

Despite presenting very similar structural properties, rare earth (RE) phosphate and vanadate solids display different spectroscopic behaviors, which makes the elaboration of REVO4-REPO4 mixed structures an interesting prospect for the design of luminescent materials with improved activity. This work describes the application of a two-step colloidal precipitation approach for the formation of REVO4- REPO4 heteronanostructures and an investigation of their luminescent properties. The growth of the phosphate phase over REVO4 particles was kinetically evaluated through spectroscopic methodologies comprising the observation of the VO43- -> Eu3+ energy transfer and the absorption of vanadium(V) peroxocomplexes in solution. This confirmed an effective coating of the precursor nanoparticles. In order to obtain materials with enhanced properties, a protected annealing methodology in SiO2 was applied, leading to highly crystalline nanorods with low degree of aggregation. The final materials display efficient emissions in the red, green, and blue (RGB) regions under VUV, UV, or NIR excitation according to their composition. The described structures are promising for light generation in several different systems and can be tuned to provide RGB emissions as VUV-excited phosphors and as NIR or UV colloidal luminescent biomarkers. (AU)

• Processo FAPESP: 13/01669-1 - Luminóforos nanoestruturados e sistemas core@shell contendo terras raras: aplicações em marcação biológica, iluminação e visualização
• Beneficiário: Paulo Cesar de Sousa Filho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/22930-2 - Nanopartículas coloidais luminescentes à base de terras raras: estudos fundamentais em escala individual e aplicações como sondas biológicas
• Beneficiário: Paulo Cesar de Sousa Filho
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado