Pascaline Patureau, Research associate
New fluorescent materials based on sulfur anions
Fluorescent materials have attracted increasing interest in the scientific community and they are nowadays essential in our everyday life, especially for their use in new generation of low energy lighting. However, the vast majority of the fluorescent materials present on the market are based on rare earth elements. The location and the extraction of rare earth elements could be one of the biggest environmental and economic issue in the near future. One solution to these issues would be to develop Rare Earth Element (REE) free fluorescent materials, with the same durability and, even more importantly, comparable light emission efficiencies.
One species we have identified for this purpose is the simple [S2−] anion. This anion is known to occur trapped in certain minerals, in which only a very low level of [S2−] produces a very strong orange/yellow/red fluorescence when exposed to wavelengths between 350 (long UV) and 400 nm (blue/violet) light. Our work concerns the synthesis of new materials containing [S2−] with optimized fluorescence efficiencies equivalent to, or better than, those of the natural minerals. For this purpose, we focus on improving our understanding of the [S2−] host structures and thus the relationships existing between the different crystallographic structures and their optical properties. In particular we have investigated the synthesis and properties of sodalite and scapolite, two sodium aluminosilicates of general formula Na8[AlSiO4]6(Cl,SO4,S) and (Na,Ca)4[(Al,Si)3Al3Si6O24](Cl,CO3,SO4, S2).
In progress : P. Patureau, M. T. Weller, ‘luminescence of natural and synthetic sodalites : toward new rare-
D. Walsh, P. Patureau, J. Walton, J. Potticary, S. R. Hall, and M. T. Weller, ‘Visible light promoted photocatalytic water oxidation: effect of fluctuating light intensity upon reaction efficiency’, RSC Adv., vol. 6, no. 99, pp. 97363–97366, 2016.
P. Patureau et al., ‘Persistent type-
P. Patureau et al., ‘Incorporation of Jahn–Teller Cu2+ Ions into Magnetoelectric Multiferroic MnWO4: Structural, Magnetic, and Dielectric Permittivity Properties of Mn1–xCuxWO4 (x ≤ 0.25)’, Inorg. Chem., vol. 54, no. 22, pp. 10623–10631, Nov. 2015.