Preparation and Optical Properties of YVO4:Yb3+/Ho3+ Upconversion Luminescent Materials
JI Hong-bo1, WANG Yun-zheng1, LI Zhao2*, WU Kun-yao1, 2, CHEN Wei-xing1*
1. School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710000, China
2. School of Materials Engineering, Xi'an Aeronautical University, Xi'an 710077, China
Abstract：YVO4:Yb3+/Ho3+ up-conversion luminescent materials were synthesized by the high-temperature solid phase method. The samples' phase structure, apparent morphology, and luminescence properties were investigated by X-ray diffractometer, scanning electron microscope, Fourier infrared spectrometer, and fluorescence spectrometer. The results show that the crystal structure of YVO4 is not changed by doping with different concentrations of rare earth ions, and the phase structure of the sample is pure. The infrared spectrum shows that the sample belongs to the YVO4 phase of the orthorhombic system. XPS results showed that Yb and Ho were mainly doped into YVO4 as trivalent ions. SEM analyzed the apparent morphology of the sample to show that the sample is a crystallized and micron-sized powder. The fluorescence spectra showed that the main absorption peaks of YVO4:Yb3+/Ho3+ phosphor were 418 nm (5I8→5G5), 455 nm (5I8→5G6), 486 nm (5I8→5F3), 539 nm (5I8→5F4/5S2) and 650 nm (5I8→5F5). The main emission peaks are in the 550 nm (5S2/5F4→5I8) and 660 nm (5F5→5I8) regions. The upconversion luminescence intensity increases first and then decreases with the increase of the Ho3+ doping ratio and reaches the highest when the Ho3+ doping concentration is 1%. According to Blasse's theory, the ion energy transfer mechanism in YVO4:Yb3+/Ho3+ luminescent materials is characterized by multiple dipole moments. The dependence between upconversion luminescence intensity and pump power indicates that red and green light emission belong to the two-photon absorption process. The color coordinates of the samples are all in the red light region, proving that the phosphor is a fluorescent material that can be excited by 980 nm to mainly produce red emission.
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