Abstract
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.
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