Synthesis and luminescence properties of Yb 3+ and Er 3+ doped KLa(WO 4) 2 nanoparticles

Abstract

The luminescent nanocrystalline Yb 3+ and Er 3+ codoped KLa(WO 4) 2 has been prepared by Pechini method. X-ray diffraction and transmission electron microscope were used to study the structure of the obtained samples. The average grain size of these samples depended on the annealing temperature, increasing with the increase of the temperature. The cell parameters and the crystallite size of KYb x Er 0.02La 0.98− x (WO 4) 2 nanocrystalline decreased with the increase of x value. Luminescence studies showed that the intensity of upconversion emission of the Yb 3+ and Er 3+ codoped samples was much stronger than that of the Er 3+ single doped samples (pumped by 980 nm LD). The upconversion emission mechanisms suggested that all the three bands of upconversion emissions were two-photon process.