The Study Of Optimization Design Synthesis On Rare-earth Ions Doped Molybdate Phosphors

Rare earth ions doped luminescent materials have attracted great attention in recent years due to lots of advantages, such as the low energy consumption, low pollution, high efficiency, small volume and so on. Those compounds play an indispensable role in displays, lightings and instructions. Among a large number of host materials for accommodating rare earth ions, the molybdate are prosperous ones to possess their favorable spectroscopic properties as well as high chemical durability and thermal stability, etc.With the rapid development of science and technology in the modern society, achieving optimization of process and objectives has become an important principle to resolve the scientific research, engineering design, production process and other aspects practical problems. However in the many optimization methods, the experiment design optimization is widely applied to practical production because of flexible design, convenient calculation and reliable results and so on. So in this paper, an important challenge in the design and analysis of rare earth preparation experiment is to optimize luminescence intensity, i.e., the best luminescence condition can be forecasted in a given range of factors. The main results are listed as follows.1. Er3+/Yb3+co-doped NaLa(MoO4)2phosphors were synthesized via a conventional solid-state reaction method. The crystal structure of obtained phosphors was examined through XRD. The quadratic general rotary unitized design of two factors, the concentrations of Er3+and Yb3+were employed to study the influence of doping concentrations to luminescence intensity. The regression mathematical model was established and optimum doping concentrations were determined to obtain the highest upconversion luminescence by genetic algorithm method. Finally upconversion (UC) luminescence properties of optimized samples and NaYF4:Er3+/Yb3+were investigated in the aspects of UC luminescence mechanism and thermal effect.2. The optimal method of quadratic general rotary unitized design and uniform design were used to look for the best luminescence of NaLa(MoO4)2:Ho3+/Tm3+/Yb3+ phosphors. Ho3+/Tm3+/Yb3+co-doped NaLa(MoO4)2phosphors were synthesized via a conventional solid-state reaction method. The crystal structure of obtained phosphors was examined through XRD. The regression mathematical model was established and optimum doping concentrations were determined to obtain the highest upconversion luminescence by genetic algorithm method.