Study On Photoluminescence Property And Application Of Rare Earth Ions Doped SrMoO 4 Nanocrystal Powders

Upconversion luminescence nano-materials of doping rare earth irons have various appliations in many fields such as optical temperature sensor, upconversion phosphor, biological fluorescent labels and three-dimensional display etc. With the research of upconversion luminescence nano-materials of doping rare earth irons more and more in-depth in recent years, people have been hoping to find a host matrix with high luminous efficiency and good chemical stability. Strontium Molybdate(SrMoO₄) is the materials of good chemical stability, which is researched less in recent years. This paper studied the synthesis and upconversion luminescence properties of the Er³⁺/Yb³⁺ co-doped SrMoO₄ nanocrystals, and studied its temperature characteristics. Finally, we studied the white upconversion luminescence characteristics of rare earth ions doped SrMoO₄ nanocrystals.In this paper, Er³⁺/Yb³⁺ co-doped SrMoO₄ nano-powders were synthesized by the Sol-gel method. We analyzed the microcosmic structure and characteristics of samples by XRD. Under 980nm excitation, got strong green and weak red emission. Through to optimize the concentration of the rare earth ions, got the nano-powders with the best luminous intensity. We analyzed the up-conversion photoluminescence processes. Through the research of different concentrations of Yb³⁺ doped SrMoO₄: Er³⁺ and Y2O3: Er³⁺, the Er³⁺/Yb³⁺ co-doped SrMoO₄ nanocrystals are proved good green emitting materials, which have great potential in temperature measurement. With the FIR technology, the sensitivity of the sample SrMoO₄: 1mol%Er³⁺/2mol%Yb³⁺ were obtained. We got the maximum of the sensitivity when using fluorescence intensity ratio of 529nm and 545nm.Tm³⁺/Yb³⁺ and Ho³⁺/Yb³⁺ co-doped SrMoO₄ nano-powders were synthesized. The up-conversion luminescence spectra and up-conversion photoluminescence processes were studied. The concentration of Tm³⁺ and Ho³⁺ were optimized and determined to obtain the white light. Tm³⁺/Ho³⁺/Yb³⁺ tri-doped SrMoO₄ nanocrystals were synthesized. The up-conversion luminescence spectra and up-conversion photoluminescence processes were studied. After adjusting power, we got the upconversion fluorescent color coordinates is close to the standard white coordinates. In order to get more standard white light, the Er³⁺ ions was doped Tm³⁺/Ho³⁺/Yb³⁺ tri-doped SrMoO₄ nanocrystals. Ho³⁺/Er³⁺/Tm³⁺/Yb³⁺ quadri-doped SrMoO₄ nanocrystals were synthesized by optimizing. The upconversion fluorescent color coordinates is very close to the standard white coordinates. Finally, we studied the influence of excitation power to color coordinates of Tm³⁺/Ho³⁺/Yb³⁺ tri-doped SrMoO₄ nanocrystals and Ho³⁺/Er³⁺/Tm³⁺/Yb³⁺ quadri-doped SrMoO₄ nanocrystals.