Fig. 2From: (La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)XRD patterns of the (La0.97RE0.01Yb0.02)2O2S upconversion phosphors calcined from their layered precursors in flowing H2 (200 ml/min) at 1200 °C for 1 h. The standard diffractions of La2O2S are included as bars for comparisonBack to article page