Facile Synthesis of Yb³⁺- and Er³⁺-Codoped LiGdF₄ Colloidal Nanocrystals with High-Quality Upconversion Luminescence

Figure 2

XRD patterns of LiGdF₄:Yb³⁺/Er³⁺ colloidal nanocrystals, which are synthesized at and , 2 h, 3 h, 4 h, and 5 h.