Experimental Optimization Design Of LnOCl:Er³⁺/Yb³⁺ Phosphors And Their Upconversion Luminescence Properties

Rare-earth doped luminescent materials have been widely concerned because of their important applications in lasers,color displays,solar cells,and biomedicine.The focus of research includes improving synthesis methods and increasing efficiency of up-conversion luminous.In this paper,chlorine oxide with stable physicochemical properties is selected as the matrix,and the optimal doping concentration of LnOCl:Er3+/Yb3+(Ln=Y,La,Gd)phosphor is optimized through experimental optimization methods,and the luminescence characteristics are explored.The main research content includes:The method of experimental optimization design was used to optimize the doping concentration of Er3+/Yb3+co-doped YOCl phosphor.First,the optimal doping concentration range of YOCl:Er3+/Yb3+ was explored through uniform design,and then the mathematics model between the Er3+/Yb3+ co-doping concentration and the red up-conversion luminescence intensity was established by using the method of quadratic universal rotation combination design.In addition,genetic algorithm was used to calculate the optimal doping concentration of the maximum emission intensity of red light.The YOCl:Er3+/Yb3+ phosphor was prepared by the traditional high-temperature solid method,and the optical properties of the optimal sample were systematically studied.By measuring the emission spectrum under 1550 nm laser excitation,it was found that the up-conversion emission of green light and red light are both three-photon processes.The optimal sample temperature sensing characteristics were studied,and its temperature quenching was discussed.GdOCl:Er3+/Yb3+ phosphor was synthesized by high temperature solid method.The quadratic regression orthogonal combination design was used to establish the quadratic regression equation.The doping concentration of Er3+/Yb3+was optimized,and the optimal doping concentration were obtained at excitation of 980 nm and 1550 nm respectively.The optimal samples with the maximum luminous intensity under excitation at 980 nm and 1550 nm were synthesized respectively,and the optical properties and thermal stability of the optimal sample were studied.LaOCl:Er3+/Yb3+phosphors were synthesized by high-temperature solid method,and the doping concentration of the sample was optimized by experimental optimization.At the same time,the optical properties of LnOCl:Er3+/Yb3+(Ln=Y,La,Gd)phosphors were compared.The results show that different Ln3+ make a significant effect on the up-conversion luminescence intensity,but it does not affect the luminescence mechanism.The spectra with variable temperature of LnOCl:Er3+/Yb3+(Ln=Y,La,Gd)phosphors were measured to study the temperature sensing characteristics of different optimal samples.