Abstract:

In recent years， rare-earth-doped up-conversion luminescent materials have received increasing attention in solar cells， industrial lighting， and medical fields. The current research is mainly to find new and efficient rare-earth up-conversion luminescent materials. For the study of luminescent materials， the choice of matrix is particularly important. Molybdate stands out from many matrixes due to its stable physical and chemical properties and low phonon energy. In this paper， molybdate is selected as the matrix material doped with rare earth ions. Tm and Yb ion-doped NaGd（MoO₄）₂ samples are prepared by hydrothermal method， and the change of the luminescence characteristics of NaGd（MoO₄）₂ phosphor is explored by changing the ion doping concentration. Through the analysis of its spectrum， it is found that under 980 nm laser irradiation， NaGd（MO₄）₂∶Yb³⁺/Tm³⁺ has a blue emission peak at 477 nm and a red emission peak at 648 nm. When the doping mole fraction of fixed Yb³⁺ is 6% and the doping mole fraction of Tm³⁺ is changed to 0， 0.5%， 1% and 2% respectively， it is found that with the increase of the doping mole fraction of Tm³⁺， the intensity of the emission peak at 477 nm first increases and then decreases. When the doping mole fraction of Tm³⁺ is 0.5%， the luminous intensity of molybdate phosphor first increases and then decreases to the maximum. It has broad prospects in the application of multi-color lighting and light source devices.

Key words: Rare earth doping, Molybdate, Up-conversion luminescence, Micromorphology