Effective up-conversion behaviors for Er3+–Yb3+-doped SrF2 phosphors synthesized by flux-assist method
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Up-converting materials composed of Sr0.925−3x/2ErxYb0.05F2 (x = 0.001–0.075) were synthesized using excess NH4F flux at 950 °C for 2 h. X-ray diffraction patterns and scanning electron microscopic images were obtained from samples of Sr0.925−3x/2ErxYb0.05F2 phosphors prepared using different molar ratios of Sr((Er,Yb)O3/2)CO3:NH4F. The effective Er3+ emission spectra in the Sr0.925−3x/2ErxYb0.05F2 phosphors that depend on the concentrations of Er3+ and Yb3+ ions were explored during excitation with a 980-nm wavelength diode laser. The emission intensity of the laser diode has two dependencies that were investigated—the pump power has to be constrained within the range of 77–118 mW, and the temperature of the Sr0.91Er0.01Yb0.05F2 phosphor must range from 25 to 175 °C. The fluorescence intensity ratio and sensitivity were calculated based on the energy levels of the Er3+ dopant ions in the phosphor. When Au nanoparticle solution was dispersed on the Sr0.91Er0.01Yb0.05F2 phosphor, the luminescent intensity of the phosphor was obviously enhanced by the surface-plasmon-resonance effect.
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the ministry of Education, Science and Technology (NRF-2018R1D1A3B07048543). This work was supported by the BB21 + Project in 2018.
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