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Simultaneously tunable luminescence and magnetic properties in bifunctional NaYF₄: Yb³⁺/Er³⁺ microcrystals

Zhijun Tang^a,*, Quan Liu^a, Xiaofeng Wu^a, Shigang Hu^a, Zaifang Xi^a, Shiping Zhan^b, Yunxin Liu^b,*

 
ABSTRACT:     A series of bifunctional NaYF4 microcrystals doped with Yb³⁺/Er³⁺ have been successfully synthesized through a facile hydrothermal method. They have been characterized by XRD, SEM, photoluminescence spectra and the magnetization. These microcrystals can emit ∼540 nm green light from Er³⁺- 4ƒ ⁿ electronic transition ⁴S_3/2- ⁴ I_15/2, ∼657 nm red light from Er³⁺- 4ƒ ⁿ electronic transition ⁴ F_9/2-⁴ I_15/2, and ∼407 nm violet light from Er³⁺- 4ƒⁿ electronic transition ²H⁴_9/2I_15/2, under the excitation of 980 nm infrared light. It is found that the red emission is more sensitive to the doping of Yb³⁺ ion than the green one, leading to the significant increase in the ratio of red emission to green emission with increasing concentration of Yb³⁺ ion. In addition, the paramagnetic property was remarkably enhanced with increasing concentration of Yb³⁺ ion which is ascribed to the substitution of nonmagnetic ion Y³⁺ by the magnetic ion Yb³⁺ with large magnetic moment.

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* Corresponding author, E-mail: zjtang@hnust.edu.cn, lyunxin@163.com

Received 15 Aug 2019, Accepted 23 Apr 2020