Comparison of upconversion luminescent properties and temperature sensing behaviors of β-NaYF4:Yb3+/Er3+ nano/microcrystals prepared by various synthetic methods
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In this paper, Yb3+/Er3+ co-doped hexagonal NaYF4 have been successfully synthesized by solvothermal, thermal decomposition, hydrothermal and molten salt method, respectively. The crystal structures, particle morphologies, sizes and corresponding upconversion luminescent properties of β-NaYF4:Yb3+/Er3+ nano/microcrystals are systemically studied. It is interesting to observed that the temperature-dependent UC luminescent properties of β-NaYF4:20 %Yb3+, 2 %Er3+ samples are strongly related to their synthesis methods. Comparison of the upconversion luminescence and thermal sensitivity between the β-NaYF4:Yb3+/Er3+ samples reveals that β-NaYF4:Yb3+/Er3+ sub-microplates synthesized by thermal decomposition method have much stronger green emission intensity, better luminescent thermal stability and higher temperature sensitivity. This findings are relevant to the application of β-NaYF4:Yb3+/Er3+ in optical temperature sensors and to the further understanding of the UC luminescent mechanism.
KeywordsNaYF4 Nonradiative Relaxation Thermal Decomposition Method Molten Salt Method High Temperature Sensitivity
This project has been financially supported by Zhejiang Provincial Natural Science Foundation of China (LQ15E020004), the National Natural Science Foundation of China (61372025), the college students’ activities of science and technology innovation in Zhejiang Province (2015R407033) and the Science and Technology Project of Zhejiang Province (2015C37037).
- 29.L. Tong, X. Li, R. Hua, X. Li, H. Zheng, J. Sun, J. Zhang, L. Cheng, B. Chen, Comparative study on upconversion luminescence and temperature sensing of α- and β-NaYF4:Yb3+/Er3+ nano-/micro-crystals derived from a microwave-assisted hydrothermal route. J. Lumin. 167, 386–390 (2015)CrossRefGoogle Scholar