Rare‐earth‐free Li5La3Ta2O12:Mn4+ deep‐red‐emitting phosphor: Synthesis and photoluminescence properties. - Cao, Renping; Lv, Xinyan; Ran, Yaqin; Xu, Longxiang; Chen, Ting; Guo, Siling; Ao, Hui; Yu, Xiaoguang (Journal of the American Ceramic Society, 2019)