α- and β-AgVO3 polymorphs as photoluminescent materials: An example of temperature-driven synthesis

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 crystallinepolymorphs α-AgVO₃ and β-AgVO₃. Photoluminescence emission (PL) performance is analyzed; at low temperatures (up to 35 °C) when α-AgVO₃ is formed the PL emission is red, while at temperatures larger than 45 °C when β-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 [AgO_x] (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.