Fig. 3From: (La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)FE-SEM particle morphologies of the (La0.97Ho0.01Yb0.02)2(OH)4SO4·2H2O (a) and (La0.97Er0.01Yb0.02)2(OH)4SO4·2H2O (b) layered precursors and the (La0.97Ho0.01Yb0.02)2O2S (c) and (La0.97Er0.01Yb0.02)2O2S (d) upconversion phosphorsBack to article page