Abstract
Abstract Highly crystalline β-NaYF 4 :Yb 3+ /Nd 3+ /Tm 3+ /Mn 2+ nanophosphors were prepared by sol-gel methods with isopropyl alcohol as complexing agent. X-ray diffraction analysis data demonstrated that hexagonal phase β-NaYF 4 was successfully synthesized by a calcination process on the as-prepared precursor at 550 °C for 1 h. Under a 980 nm laser diode (LD) excitation, the samples demonstrated bright upconversion luminescence (UCL), which was caused by the energy level transition of Tm 3+ and Nd 3+ ions. With the increase of the doping concentration of Mn 2+ ions, the UCL intensities in the blue light region increased firstly and then decreased, meanwhile, the UCL intensities in the red, yellow and green light region gradually increased. Color-tunable UCL of the sample was generated by the continuous variation of the pumping power of 980 nm LD.
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