Structural, morphological and photoluminescence properties of beta-Ag2MoO4 doped with Eu3+

Author(s)

Almeida, Priscila B. ; Pinatti, Ivo M. ; de Oliveira, Regiane C. ; Teixeira, Mayara M. ; Santos, Clayane C. ; Machado, Thales R. ; Longo, Elson ; Rosa, Ieda L., V

• Document type: Journal article
• Source: CHEMICAL PAPERS; v. 75, n. 5, p. 14-pg., 2021-01-04.

Abstract

In this work, we report the investigation on beta-Ag(2-3x)EuxMoO4 (x = 0.0; 0.0025; 0.005; 0.0075, and 0.01 mmol) materials prepared using the coprecipitation method. X-ray diffraction (XRD), Rietveld refinement analysis, and Raman spectroscopy confirmed that all of the synthesized beta-Ag(2-3x)EuxMoO4 samples were perfectly monophasic, with spinel-like cubic structure. The results obtained in the morphological analysis indicate that the insertion of the Eu3+ ion into the beta-Ag2MoO4 matrix favors the formation of surface defects and suggests that in higher concentrations of dopant the particles become more geometrically defined. The photoluminescence analysis (PL) was performed using two excitation sources: krypton laser and xenon lamp. Through the emission and excitation spectra it was observed that beta-Ag2MoO4 exhibits broad band in the blue region, and as the concentration of Eu3+ increases this emission is gradually suppressed, giving rise to an intense emission with narrow and well-defined lines in the red region, confirming beta-Ag2MoO4 as a good matrix capable of sensitizing and stabilizing the red emission of the Eu3+ ion. In addition, all other characterizations demonstrate that the replacement of Ag+ by Eu3+ ions caused structural, morphological, and optical changes with lattice disturbances in the short, medium, and long ranges. (AU)

• FAPESP's process: 13/23995-8 - Synthesis of silver tungstate doped with Eu3+ and the study of their optical, photoluminescent and photocatalytic properties
• Grantee: Ivo Mateus Pinatti
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 16/05661-3 - Synthesis, characterization and photophysic study of silver tungstates doped with rare earths
• Grantee: Ieda Lucia Viana Rosa
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/03722-3 - Evaluation of the Theoretical, Structural and Morphological Properties of Selenium and Silver Nanomaterials for Photoluminescent and Biological Application
• Grantee: Ivo Mateus Pinatti
• Support Opportunities: Scholarships in Brazil - Post-Doctoral