Study On The Improvement Of Upconversion Luminescence Performance Of NaYF₄：Yb³⁺/Tm³⁺ And Y₂O₃：Er³⁺,Y₂O₃：Yb³⁺/Er³⁺ Micrometer Crystals By Doping Z

In the past few decades,up-conversion（UC）photoluminescence（PL）materials have gained increasing attention for their ability to absorb multiple low-energy long-wave radiations,thus turning infrared light invisible to the human eyes into visible light.Rare-earth doped UC compounds have the advantages of high luminescence efficiency.Their output wavelength has the advantage of certain tunability and long life.They have broad applications in bioimaging,multidimensional displays,anti-counterfeit sensors and biomedical diagnostics.So far,many researchers have been trying to improve the strength of UC by tuning the internal microstructure or changing the outside environment,involving the combination of non-lanthanide ions,controlling the content of sensitizers and activators,and the creation of core-shell architectures.In this paper,the luminescence enhancement of Na YF₄:Yb³⁺/Tm³⁺and Y₂O₃:Er³⁺,Y₂O₃:Yb³⁺/Er³⁺with non-lanthanide ions Zr⁴⁺under 980 nm excitation has been investigated as follows.1.Study of luminescence properties of Zr⁴⁺-doped Na YF₄:Yb³⁺,Tm³⁺crystals under980 nm excitation.In the Na YF₄:20 mol%Yb³⁺,0.5 mol%Tm³⁺,x mol%Zr⁴⁺（x=0,2,4,6,8,10）crystals,the UC luminescence intensity of the crystals increased with the increase of Zr⁴⁺concentration,the emission intensity reached the maximum when the Zr⁴⁺doping concentration reached 4 mol%.The main reason for the increased emission intensity of the micrometer crystals is that the Zr⁴⁺ion doping leads to a change in the local symmetry around the Tm³⁺ions,which results in an increase in the luminescence intensity of the Tm³⁺ions.This is important for further studies of upconversion luminescent materials doped with non-lanthanide Zr⁴⁺ions.2.The luminescence properties of Zr⁴⁺/Er³/Yb³⁺co-doped Y₂O₃phosphors under 980nm excitation were investigated.In the synthesized Y₂O₃:1 mol%Er³⁺,x mol%Zr⁴⁺（x=0,2,4,6,8,10）phosphor,the upconversion luminescence intensity of the phosphor increased with the increase of Zr⁴⁺concentration,and the emission intensity reached the maximum when the Zr⁴⁺doping concentration reached 2 mol%.In the synthesized Y₂O₃:1 mol%Er³⁺,2 mol%Yb³⁺,x mol%Zr⁴⁺（x=0,2,4,6,8,10）phosphor,the upconversion luminescence intensity of the phosphor increased with the increase of Zr⁴⁺concentration,and the emission intensity reached the maximum when the Zr⁴⁺doping concentration reached 4mol%.SEM spectra showed the synthesized Y₂O₃phosphor samples,and the XRD spectra also maintained consistency with the standard card Y₂O₃consistent.This provides a reference for studying the luminescence properties and fluorescence lifetime of non-lanthanide ion samples with different doping concentrations.