Studies On Preparation And Upconversion Luminescence Properties Of Yb³⁺, Tm³⁺ Co-doped Zirconia And Their Mixed Oxides

Since the sixties of last century the concept of conversion has been formally proposed,whether it is on the conversion of materials preparation, application of up-conversionmaterials, or conversion mechanism studies have made significant progress. Upconversionmaterials from the substrate and activator of two parts.The choice of matrix material directlyrelated to the preparation of material end-use performance. Upconversion of the matrixmaterials are fluoride, chloride, oxide, etc., in the three matrix materials, because the oxidehas a simple preparation process, the environmental requirements of low and stableperformance, etc. and get widespread attention. This paper uses the ZrO₂matrix material andcomposite oxides, rare earth ion Yb³⁺, Tm³⁺doped ions, using different methods of chemicalsynthesis of synthetic lightemitting materials of different systems. And its properties werecharacterized. The main contents are as follows:.We use low-temperature combustion synthesis of ZrO₂:Yb³⁺/Tm³⁺upconversion systemmaterials. Studied the calcination temperature, Tm³⁺ion doping concentration, pump power ofup-conversion luminescence. The results show that: upconversion luminescence intensity ofsamples with the calcination temperature increased with the increase; Tm³⁺ions on theupconversion luminescence intensity change is mainly due to the high concentration of Tm³⁺ions caused by the effective cross-relaxation; upconversion process number n of photonsabsorbed pump power at different complex changes within the scope of the conversion bydifferent mechanisms and high power due to thermal effects.With ethanol as solvent, using EDTA as complexing agent prepared by precipitation ofZrO₂:Yb³⁺/Tm³⁺upconversion system materials. Studied the incorporation of EDTA samplesof grain size on the upconversion luminescence intensity and impact. The results showed thatwith the incorporation of EDTA increases the grain size decreases, but the upconversionluminescence intensity was gradually increased. This phenomenon may be due to the differentcrystalline nanocrystals due to different internal defects caused. The study also found that theblue Tm³⁺ions with upconversion of Yb³⁺ion concentration increases firstly and thendecreases with increasing tendency.¹G₄level of Tm³⁺ions Yb³⁺lifetime with increasing ionconcentration decreases. Through analysis that the introduction of the Yb³⁺ions increases thelattice defects in the matrix, resulting in the energy levels of Tm³⁺ions reduce the life. Using sol-gel prepared ZrO₂（CaO）:Yb³⁺/Tm³⁺upconversion system materials. Thematerial prepared at room temperature with a characteristic fluorescence of Tm³⁺ion emission,the main emission in the blue, the center wavelength at470nm or so, and came to the rareearth ions and energy transfer between the matrix. Calcination temperature of samples ofdifferent studies have shown that different calcination temperatures, the conversion ofdifferent fluorescence properties. Analysis of the transition on the conversion mechanism,found ZrO₂（CaO）: Yb³⁺/Tm³⁺blue for the three-photon process. Discussed the Yb³⁺iondoping on the upconversion luminescence of the impact, while discussing the incorporation ofCaO on the product and upconversion luminescence properties and the effect of matrix on theupconversion luminescence effects.