Fig. 7From: (La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)A schematic illustration of the energy levels and UC processes for (La0.97Er0.01Yb0.02)2O2S phosphorBack to article page