Low temperature synthesis of NIR reflecting bismuth doped cerium oxide yellow nano-pigments

A new series of yellow inorganic pigments possessing high solar reflectance based on bismuth doped cerium dioxide was synthesized by sol-gel hydrothermal method at 150 °C for 24 h. The band gap of developed nano-pigments changes from 2.89 to 2.58 eV, displaying colors ranging from pale yellow to bright yellow.