The Effects Of Al³⁺,Morphology And Length Of NaYF₄:Yb³⁺,Er³⁺on Upconversion Luminescence And Nearinfrared Photoelectric Response

In this paper,a new upconversion Al³⁺ doped NaYF₄:Yb³⁺,Er³⁺ particles were successfully synthesized by hydrothermal method and sintered with TiO2 to form heterojunction structures.The effects of different Al³⁺ doping concentration,particle morphology and length on photoluminescence properties of the particles and the photoelectric properties of heterojunction structures were studied by field emission transmission electron microscopy,field emission scanning electron microscopy,X-ray powder diffraction,fluorescence spectroscopy and electrochemical analysis.The results show that the upconversion luminescence intensity increased by about 2.5 times,3.5 times and 2.6 times respectively at 525 nm,540 nm and 654 nm,and the photoelectric performance increased by about 1.8 times compared with NaYF₄:Yb³⁺,Er³⁺ NPs when the concentration of Al³⁺ is 13%mmol.Compared with the spherical Al³⁺ doped NaYF₄:Yb³⁺,Er³⁺,the upconversion intensities of the columnar Al³⁺ doped NaYF₄:Yb³⁺,Er³⁺ increased by about 1.6 times,3 times and 3.4 times respectively at 525 nm,540 nm and 654 nm,and the photoelectric performance increased by about 1.8 times.Compared with 1 μm columnar Al³⁺ doped NaYF₄:Yb³⁺,Er³⁺,the upconversion luminescence intensity of 6 μm columnar Al³⁺doped NaYF₄:Yb³⁺,Er³⁺ increased by about 2.1 times,2.5 times and 3.3 times respectively at 525 nm,540 nm and 654 nm,and the photoelectric performance increased by about 2.25 times,which provides a new idea for the application of rare earth in the field of upconversion optoelectronics.