alpha- and beta-AgVO3 polymorphs as photoluminescent materials: An example of temperature-driven synthesis

Author(s)

Oliveira, Regiane Cristina ^[1] ; Teixeira, Mayara Mondego ^[1] ; Costa, Joao Paulo C. ^[1] ; Penha, Maya ^[1] ; Francisco, Eric Mark ^[1] ; da Silva, Jussara Soares ^[1] ; Li, Maximo Siu ^[2] ; Longo, Elson ^[1] ; Gracia, Lourdes ^[3] ; Andres, Juan ^[4]

Affiliation

^[1] Univ Fed Sao Carlos, INCTMN CDMF, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, IFSC, POB 369, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Valencia, Dept Quim Fis & Analit, E-46100 Burjassot - Spain

^[4] Univ Jaume 1, Dept Quim Fis & Analit, Castellon de La Plana 12071 - Spain

• Document type: Journal article
• Source: CERAMICS INTERNATIONAL; v. 44, n. 6, p. 5939-5944, APR 15 2018.
• Web of Science Citations: 6

Abstract

Controlling the synthesis of a given polymorph of an inorganic material is a further step in the design of property and function. In this letter, we report for the first time a simple procedure to effectively control the reversible transformation between the crystalline polymorphs alpha-AgVO3 and beta-AgVO3. Photoluminescence emission (PL) performance is analyzed; at low temperatures (up to 35 degrees C) when alpha-AgVO3 is formed the PL emission is red, while at temperatures larger than 45 degrees C when beta-AgVO3 is obtained the color of emission PL emission goes from green to blue. The findings highlight the ability of temperature to dramatically alter the nature of phase transformation at the atomic level. The phase transformation is driven by the short-range structural and electronic changes of {[}VO4] and {[}AgOx] (x = 5, 6, and 7) clusters (building blocks of both monoclinic structures), and hence is dependent on the temperature employed during synthesis. These outcomes clearly demonstrate that the AgVO3 crystals exhibited appropriate activity for application in visible lamps, displays, and other optical devices. (AU)

• FAPESP's process: 13/26671-9 - Theoretical and experimental study of multifunctional semiconductors
• Grantee: Amanda Fernandes Gouveia
• 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