Dual‐mode optical thermometry and multicolor anti‐counterfeiting based on Bi3+/Er3+ co‐activated BaGd2O4 phosphor. - Fu, Jie; Zhou, Liuyan; Chen, Yanling; Lin, Jianhua; Ye, Renguang; Lei, Lei; Shen, Yang; Deng, Degang; Xu, Shiqing (Journal of the American Ceramic Society, 2023)