# CaS:Mn1-xPbx Luminescent Material Production from Phosphogypsum

## TL;DR

This paper shows how to make orange and red UV pigments from industrial waste called phosphogypsum, using manganese and lead doping.

## Contribution

For the first time, orange- and red-emitting pigments were produced from phosphogypsum using a sulfide matrix.

## Key findings

- Luminescent materials with orange to red–orange emission were created using CaS:Mn1-xPbx.
- XPS and other techniques confirmed the structural and elemental properties of the new materials.
- Red luminescence intensity increased sharply under short-wavelength UV for CaS:Mn.

## Abstract

This paper explores the feasibility of producing manganese- and lead-doped luminescent materials from phosphogypsum. For the first time, orange- and red-emitting ultraviolet pigments were obtained using a sulfide matrix reduced from phosphogypsum. The resulting materials were characterized using X-ray diffraction (XRD), transmission electron microscopy, Fourier transform infrared spectroscopy, elemental analysis, and X-ray photoelectron spectroscopy (XPS). Doping with manganese or lead cations is shown to produce luminophores whose luminescence shifts from orange to red–orange under UV radiation as lead cations replace manganese cations in the CaS:Mn1-xPbx solid solution. A sharp increase in red luminescence intensity was observed for CaS: Mn luminophores when they were irradiated with short-wavelength ultraviolet radiation. These results open up broad possibilities for using phosphogypsum, a high production volume (HPV) chemical waste product, to produce highly innovative products.