Investigation On Preparation And Upconversion Luminescence Properties Of Yttrium Erbium Co-doped AZO Polycrystalline Materials

With the development of modern society,up-converting luminescent materials have become a research hotspot due to their ability to convert near-infrared light into visible light.With the deepening of research,They have been applied to solar cells,multicolored displays,photovoltaic devices,biological imaging,and drug delivery.Al-doped ZnO material is widely used as a new type of n-type semiconductor material in solar cells and LCD?liquid crystal displays?.If AZO material can able to emitting fluorescence,along with its conductivity,AZO material will play an important role in optoelectronic devices,solar cells.In this paper,ytterium,erbium co-doped AZO materials were synthesized by sol-gel method.The XRD,SEM and up-conversion luminescence spectrum analysis have shown that the best process parameters: The calcination temperature was 600 ?,the calcination time was 2 h,citric acid and urea were used as dispersants.The effect of different Al³⁺ doping concentration on the Yb³⁺/Er³⁺/AZO upconversion material was tested.It was found that with the doping concentration increased,the crystallinity of the AZO polycrystalline material increased,and the morphology changed from a hole-like structure to a sheet-like structure.At the same time,the emission color gradually change from red to green.The influence of rare earth doping concentration on the upconversion luminescence of Yb³⁺/Er³⁺/AZO polycrystalline materials were only reflected in the luminescence intensity and crystallinity,thus the optimum doping concentration of rare earth ions could be determined to achieve better upconversion intensity.The effect of pump power on the up-conversion luminescence was investigated,and it was found that the pump power can adjust the ratio of red,green and blue emission intensity.Under the 0 mol% Al³⁺ doping,the emitting color could change from red to white to green by changing the pump power.After doping Al³⁺,although the red to green ratio also changed,it output the monochromatic emitting color.For example,red,white,yellow,and green light are output when 1,2,3 and 4 mol% Al³⁺,respectively.The white light output of 2 mol% was relatively stable,which was the white light output achieved by using double-doped rare earth ions for the first time.This adjustment of the emitting color in the AZO material had important theoretical and practical implications for color display and LED lighting applications.The luminescence spectra of Yb³⁺/Er³⁺/AZO polycrystalline materials at different temperatures were analyzed.It was found that the sensitivity coefficient of 1624.12/T2 was higher.Compared to other matrix materials based on Er³⁺,AZO material had a higher temperature sensitivity coefficient,which indicates that AZO material was more suitable for temperature temperature sensor.