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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
de Sousa Filho, Paulo C. [1, 2] ; Gacoin, Thierry [2] ; Boilot, Jean-Pierre [2] ; Walton, Richard I. [3] ; Serra, Osvaldo A. [1]
Total Authors: 5
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 119, n. 42, p. 24062-24074, OCT 22 2015.
Web of Science Citations: 26
Abstract

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)

FAPESP's process: 13/01669-1 - Nanostructured phosphors and core@shell systems containing rare earths: applications in biological labeling, lighting, and visualization
Grantee:Paulo Cesar de Sousa Filho
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 14/22930-2 - Rare Earth-based colloidal luminescent nanoparticles: fundamental studies at the single particle scale and applications as biolabels
Grantee:Paulo Cesar de Sousa Filho
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor