Color modulation of cerium sulfide colorant powders through chemical doping engineering

Abstract

The successful preparation of La3+ doped cerium sulfide not only expands the number of preparation methods, but also enriches the color types and spectral properties of cerium sulfide, showing considerable market potential.

Ion Substitution Strategy toward Spectral Tunability of Environmentally Friendly Rare Earth Sulfide Lattices for Radiative Cooling

“…28,29 Our group has also previously investigated the effect of Na + doping on the structure and spectral properties of γ-Ce 2 S 3 microcrystals and the effect of La 3+ doping on the color of γ-Ce 2 S 3 . 30,31 The ions introduced during the doping process were shown to not only fill the vacancy of γ-Ce 2 S 3 , but also replace the Ce atoms, making the crystal structure more stable. color can also be explained by transition theory at the electron level, with the Ce electron transition from the 4f energy level to the 5d energy level as the main reason for the optical transition in the visible spectrum, which is also the main reason why γ-Ce 2 S 3 finally presents a red color.…”

“…The generation of γ-Ce 2 S 3 often requires a temperature of up to 1200 °C , and the use of sulfide gas H 2 S and CS 2 , posing a challenge to the window implementation of traditional production methods and a risk of gas leakage. – To date, many studies have been performed on reducing the reaction window temperature by ion doping, – and γ-Ce 2 S 3 was successfully prepared at 850 °C by introducing Na + into the reaction, enabling great improvement in production efficiency by reducing the reaction temperature . Additionally, researchers have also investigated the effect of Sr 2+ doping on the color value and thermal stability of γ-Ce 2 S 3 . , Our group has also previously investigated the effect of Na + doping on the structure and spectral properties of γ-Ce 2 S 3 microcrystals and the effect of La 3+ doping on the color of γ-Ce 2 S 3 . , The ions introduced during the doping process were shown to not only fill the vacancy of γ-Ce 2 S 3 , but also replace the Ce atoms, making the crystal structure more stable. – The change of pigment color can also be explained by transition theory at the electron level, with the Ce electron transition from the 4f energy level to the 5d energy level as the main reason for the optical transition in the visible spectrum, which is also the main reason why γ-Ce 2 S 3 finally presents a red color. – Moreover, γ-Ce 2 S 3 can gradually decompose at room temperature, releasing the toxic gas H 2 S and losing its inherent red color, so it is necessary to adopt a coating process to improve its thermal stability and oxidation resistance. – …”