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Lanthanide doped bifunctional materials are potentially important for developing multifunctional devices. Here, NaLuF_4:Yb~(3+)/Tm~(3+)/Gd~(3+)/Sm~(3+) optical-magnetic bifunctional microcrystals were successfully synthesized by hydrothermal method, which could emit ~480 nm blue light from the ~1G_4→~3H_6 electronic transition and ~800 nm infrared light from the ~3H_4→~3H_6 electronic transition of Tm~(3+) ion, under the excitation of 980 nm infrared light. By doping Sm~(3+) ion into Na Lu F4:Yb~(3+)/Tm~(3+)/Gd~(3+), the infrared emission peak centered at 800 nm would shift obviously to longer wavelength. This indicated that Sm~(3+) ion could efficiently tune the energy level gaps of Tm~(3+) ions in Na Lu F4 host which was demonstrated based on the crystal field theory. In addition, these NaLuF_4:Yb~(3+)/Tm~(3+)/Gd~(3+)/Sm~(3+) microcrystals presented unique ferromagnetic property instead of usually reported paramagnetic property. Importantly, the ferromagnetic property decreased with increasing the concentration of Gd~(3+) ion. This was in good agreement with Swift’s theoretical investigation that the coexistence of light rare earth(Gd~(3+)) and heavy rare earth(Yb~(3+)/Tm~(3+)) would lead to the anti-ferromagnetic coupling in the sub-lattices.
Lanthanide doped bifunctional materials are potentially important for developing multifunctional devices. Here, NaLuF_4: Yb ~ (3 +) / Tm ~ (3 +) / Gd ~ (3 +) / Sm ~ synthesized by hydrothermal method, which could emit ~ 480 nm blue light from the ~ 1G_4 → ~ 3H_6 electronic transition and ~ 800 nm infrared light from the ~ 3H_4 → ~ 3H_6 electronic transition of Tm ~ (3 +) ion, under the excitation of 980 nm infrared light. By doping Sm ~ (3 +) ion into Na Lu F4: Yb ~ (3 +) / Tm ~ (3 +) / Gd ~ (3+) obviously that the light level gap of Tm ~ (3 +) ions in Na Lu F4 host which was demonstrated based on the crystal field theory. In addition, these NaLuF_4 : (3 +) / Tm ~ (3 +) / Gd ~ (3 +) / Sm ~ (3+) microcrystals presented unique ferromagnetic property instead of usually reported paramagnetic property. Importantly, the ferromagnetic property decreased w This was in good agreement with Swift’s theoretical investigation that the coexistence of light rare earth (Gd ~ (3+)) and heavy rare earth (Yb ~ (3 +) / Tm ~ (3+)) would lead to the anti-ferromagnetic coupling in the sub-lattices.