Figure 7
From: Facile synthesis and emission enhancement in NaLuF4 upconversion nano/micro-crystals via Y3+ doping
XRD patterns (a) and the main diffraction peak (b) of different Y3+ doped α/β-mixed NaLuF4:Yb3+, Tm3+ nano/micro-crystals prepared at 130 °C for 12 h. (stands for the peaks of β phase).
