Dual-enhancement of chromaticity and thermal stability: in-situ synthesisof core-shell γ-Ce2S3@CePO4 configuration

Abstract Non-toxic rear earth (RE) composite materials are promising and active in optoelectronic fields, such as pigment. In this contribution, Na ions doped γ-Ce2S3 pigments was synthesized by solid-phase vulcanization and followed by in-situ synthesis to prepare an outer layer of CePO4 film. The characterizations of X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), solid state nuclear magnetic resonance (NMR) indicate that Na doped γ-Ce2S3 and CePO4 uniformly and tightly coated core-shell structure were successfully synthesized. The thermogravimetric analysis (TG) and reflection spectrum (RS) reveal that the CePO4 coating layer significantly improve the colorant and thermal stability performance of γ-Ce2S3. The excellent color quality of γ-Ce2S3@CePO4 (L*=45.16, a*=55.94, b*=44.53) is achieved and the red color (L*=43.82, a*=49.79, b*=38.04) is still retained even if the sample is heated in air at 400 °C for 30 min.