Synthesis of Tetragonal Phase LiYF₄: Yb and Tm Microcrystals with Strong UV Upconversion Fluorescence

Figure 2

XRD patterns of (a) literature data for standard NaYF₄ crystals, (b) literature data for standard LiYF₄ crystals, and (c) literature data for standard LiF crystals. XRD pattern of different molar ratio of Na⁺ ions and Li⁺ ions (c–g): 6 : 0, 4 : 2, 3 : 3, and 2 : 4.