Abstract
Yb3+-doped NaErF4 microcrystals exhibit red and green upconversion (UC) luminescence excited by 980 nm and 1560 nm lasers, respectively. The luminous intensity in the green region shows stronger under 1560 nm excitation than that under 980 nm excitation. Moreover, the intensity of eye-visible red and green luminescences is increased after doping Fe3+ ion. In addition, the doping of Fe3+ ion endows NaErF4 with magnetic characteristics, realizing the dual functions (optical and magnetic). Furthermore, the doping of Fe3+ ion makes the crystal structure easy to evolve. The effects of Fe3+ ion doping concentration and the molar ratio of F:Ln on the crystal structure of NaErF4: 20% Yb3+ were studied. Our work would afford a new doorway for designing the multifunctional materials with controllable double-color luminescence and optical-magnetic characteristics.
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