6533b7d5fe1ef96bd12650f4
RESEARCH PRODUCT
α- and β-AgVO3 polymorphs as photoluminescent materials: an example of temperature-driven synthesis
Lourdes GraciaJoão Paulo De Campos Da CostaMáximo Siu LiMaya PenhaElson LongoRegiane Cristina De OliveiraJuan AndrésMayara Mondego TeixeiraJussara Soares Da SilvaEric Mark Franciscosubject
PhotoluminescenceMaterials scienceProcess Chemistry and Technology02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencespolymorphismα-AgVO30104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsESTRUTURA ELETRÔNICATransformation (function)Phase (matter)β-AgVO3Materials ChemistryCeramics and CompositesPhysical chemistryphotoluminescenceBeta (velocity)0210 nano-technologyMonoclinic crystal systemdescription
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 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 [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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-04-01 |