Influence of Bi3+ ions on the excitation wavelength of the YVO4:Eu3+ matrix

Author(s)

Matos, Marcela G. ; Rocha, Lucas A. ; Nassar, Eduardo J. ; Verelst, Marc

• Document type: Journal article
• Source: Optical Materials; v. 62, p. 12-18, DEC 2016.
• Web of Science Citations: 8

Abstract

This work used the non-hydrolytic sol-gel process to prepare co-activated Eu3+/Bi3+ in YVO4 phosphors. We employed X-ray diffraction, which confirmed a tetragonal structure, and photoluminescence to characterize the structure and investigate the photoluminescence properties of the YVO4:Eu3+,Bi3+ matrixes. The large band between 250 and 380 nm in the excitation spectrum of YVO4:Eu3+,Bi(3+)corresponded to a ligand-metal charge transfer band (VO43- -> Eu3+). Addition of Bi3+ ions increased the charge transfer band and intensified the emission of Eu3+ ions. The x and y color coordinates of the phosphors ranged from 0.60 to 0.68 and from 0.32 to 0.39, respectively. The emission spectrum displayed an intense red emission centered at 618.5 nm, due to the D-5(0) -> F-7(2) transition of Eu3+. The optimal Bi3+ concentration in the phosphor was 1% in mol, which provided more intense emission and longer lifetime. The results indicated that YVO4:Eu3+,Bi3+ is a potential red phosphor with application as biological marker. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 12/11673-3 - Thin films obtained by spin and dip-coating using sol-gel methodology
• Grantee: Eduardo José Nassar
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/09823-4 - Use of the europium III to reveal structure of the matrices obtained by sol-gel methodology
• Grantee: Eduardo José Nassar
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/20313-8 - Intensification of the luminescence of lanthanides ions (Eu3+, Tb3+, and Tm3+) incorporated into oxides GdAlO3, Y3Al5O12, and YVO4 by Bi3+
• Grantee: Marcela Guedes Matos
• Support Opportunities: Scholarships in Brazil - Doctorate