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

Non-toxic rare earth (RE) composite materials are promising and active in optoelectronic fields, such as pigment. In this work, Na ions doped y-Ce2S3 pigments were 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 microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), solid state nuclear magnetic resonance (NMR) indicate that Na-doped y-Ce2S3 and CePO4 uniformly and tightly coated core-shell structure was successfully synthesized. The thermogravimetric analysis (TG) and reflection spectrum (RS) reveal that the CePO4 coating significantly improves the colorant and thermal stability performance of y-Ce2S3 . The excellent color quality of y-Ce2S3 @CePO4 (L* = 45.16, a* = 55.94, 6* = 44.53) is achieved and the red color (L* = 43.82, a* = 49.79, 6* = 38.04) is still retained even if the sample is heated in air at 400 degrees C for 30 min. (C) 2021 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.

Automated summary

Non-toxic rare earth composite materials with Na-doped y-Ce2S3 and CePO4 coating were successfully synthesized, showing improved colorant and thermal stability performance.