ENHANCED UP-CONVERSION OF HIGH CONCENTRATION Yb3+/Er3+-DOPED β-NaYF4 MICROPARTICLES BY CHANGING THE HOST MATRIX

With the aim of improving the up-conversion luminescence intensity of high concentration Yb3+/Er3+-doped microparticles, Yb3+/Er3+-doped beta-NaYF4/beta-NaLuF4/beta-NaYbF4 samples were prepared by the hydrothermal method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the crystal structure and morphology. Intense blue emission (H-2(11/2) -> I-4(15/2), S-4(3/2) -> I-4(15/2)) and red emission (F-4(9/2) -> I-4(15/2)) of Er3+ were observed under 980-nm excitation. When the doping concentrations of Yb3+ and Er3+ were high, the up-conversion luminescence intensity using beta-NaYbF4 as the host matrix was enhanced, and in the experiment the sample NaYbF4:16 mol%Yb3+/32 mol%Er3+ with beta-NaYbF4 as the host matrix has the strongest luminescence.