Structural and photoluminescence properties of Eu3+-doped (Y2.99-xGdx)Al5O12 phosphors under vacuum ultraviolet and ultraviolet excitation

Author(s):Show less -

Carvalho, Iure da S. ^[1] ; Barbosa, Amanda I. dos S. ^[1] ; Silva, Ariosvaldo J. S. ^[1] ; Nascimento, Patresio A. M. ^[1] ; Andrade, Adriano B. ^[1] ; Sampaio, David V. ^[2] ; Junot, Danilo O. ^[1] ; da Cunha, Thiago R. ^[2] ; Jesus, Lilian M. ^[2] ; Silva, Ronaldo S. ^[1] ; Rezende, Marcos V. dos S. ^[1]

Affiliation

^[1] Univ Fed Sergipe, Dept Fis, GNF, BR-49100000 Sao Cristovao, SE - Brazil

^[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Materials Chemistry and Physics; v. 228, p. 9-14, APR 15 2019.
• Web of Science Citations: 0

Abstract

Eu-doped (Y2.99-xGdx)Al5O12 phosphors (with x = 0, 0.5, 1, 1.5, 2, 2.5, and 2.99) were prepared by a sol-gel method using polyvinylalcohol (PVA) as gel agent. The crystal structures were characterized through X-ray diffraction and the resulting data were refined by the Rietveld method, which shows a linear increase of the lattice parameter with the Gd content. Further structural characterization was carried out via Raman spectroscopy. The effect of substituting Y3+ by Gd3+ on the Eu-doped Y3Al5O12 (YAG) photoluminescence properties was investigated using vacuum ultraviolet (VUV) and ultraviolet (UV) excitation. The excitation and emission spectra of the produced (Y2.99-xGdx)Al5O12 phosphors indicate that their luminescence properties are strongly dependent on the Gd3+ substitution. Our results also reveal a nonlinear decrease in the band-gap of these materials by increasing the Gd concentration. (AU)

• FAPESP's process: 16/15962-0 - Correlation between materials structure and dynamic and optical properties of (Ax, A'1-x)O + SiO2 (A, A' = Pb, Ni, Co, Fe, Cr) series: Raman scattering and molecular dynamics simulations
• Grantee: David Vieira Sampaio
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC