Study On The Preparation And Temperature Properties Of Upconversion Luminescent Materials

In this paper,Er³⁺/Yb³⁺co-doped CaLaAl₃O₇,La₂（MoO₄）₃,Ba₃Y（BO₃）₃ and Na₃YSi₂O₇upconversion phosphors were synthesized via traditional solid state reaction.The preparation method is simple,low cost,relatively green and environmentally friendly,and the synthesized products have good luminescence performance.The upconversion optical temperature sensing performances of the Er³⁺/Yb³⁺-codoped upconversion phosphors were investigated based on the fluorescence intensity ratio（FIR）technique,and the obtained phosphors were characterized by XRD,SEM,luminescence spectroscopy and ultraviolet visible absorption spectra.According to the synthesis and characterization methods,the specific contents are as follows:（1）The new phosphor of CaLaAl₃O₇ co-doped with Er³⁺/Yb³⁺was successfully synthesized via solid state reaction.The optimal Er^3+/Yb³⁺doping concentration was explored by investigating the luminescent properties of the phosphor at 980 nm excitation source.The variation of the doping amount of Yb³⁺on the luminescence color and luminescence intensity of CaLaAl₃O₇ was investigated.The luminescence of the up-conversion phosphors and the luminescence mechanism was explained by the double logarithmic relationship between luminescence intensity of the upconversion phosphors and the pump power of the 980 nm laser.At the same time,the temperature sensitivity of 313 K-573 K was explored by the FIR technology of two green peaks(thermal coupling level of Er³⁺).The effect of adding different cosolvents on the emission spectrum of the phosphor was explored.（2）The new phosphor of Er³⁺/Yb³⁺co-doping La₂（MoO₄）₃ was successfully synthesized by high temperature solid phase method.The optimum doping concentration of Er³⁺/Yb³⁺was investigated by investigating the emission spectra of phosphors with different Er³⁺/Yb³⁺doping concentrations at 980 nm excitation source.The effect of Yb³⁺on the luminescent properties of the phosphor was investigated by changing the doping amount of Yb³⁺.The up-conversion luminescence and luminescence mechanism was explained by the double logarithmic relationship between luminescence intensity and pump power.The temperature sensitivity of313 K-573 K was explored by the FIR technology of two green peaks(thermal coupling level of Er³⁺).The effect of different cosolvents on the luminescence intensity was explored,and the sensitivity change of the phosphor after adding Li₂CO₃ as flux was explored.（3）The Er³⁺/Yb³⁺co-doped Ba₃Y（BO₃）₃ new phosphor was successfully synthesized by high temperature solid phase method.The emission spectrum of the phosphor under the excitation source of 980 nm was observed,and the optimal Er³⁺/Yb³⁺doping concentration was explored.The luminescence properties of the Ba₃Y（BO₃）₃ phosphor were improved by introducing Yb³⁺as sensitizer.The up-conversion luminescence and luminescence mechanism are explained by the double logarithmic relationship between luminescence intensity and pump power.The temperature sensitivity of 333 K-513K was also explored by the FIR technology of two green peaks(thermal coupling level Er³⁺).（4）The new phosphor of Na₃YSi₂O₇ co-doped with Er³⁺/Yb³⁺was successfully synthesized by high temperature solid phase method.Under the excitation light source of 980 nm,the emission spectra of the phosphors under different Er^3+/Yb³⁺doping concentrations were observed,and the optimal Er³⁺/Yb³⁺doping concentration was explored.The effect of introducing Yb³⁺on the luminescence properties of Na₃YSi₂O₇ phosphors was investigated.The up-conversion luminescence and luminescence mechanism are explained by the double logarithmic relationship between luminescence intensity and pump power.In the mean time,the temperature sensitivity of 333 K-513 K is explored by the FIR technology of two green peaks(thermal coupling level Er³⁺).