Zr4+掺杂对Er3+/Yb3+共掺NaYF4微晶晶相和发光性能的影响

采用油酸辅助的水热法制备了Er³⁺/Yb³⁺共掺NaYF₄微晶，通过在反应体系中引入Zr⁴⁺离子，实现了NaYF₄微晶的晶相控制和上转换发光增强。X-射线衍射和扫描电镜结果表明：Zr⁴⁺离子的引入能够明显加快立方相α-NaYF₄向六方相β-NaYF₄的相转变过程。当Zr⁴⁺离子的引入摩尔分数为5%时，获得了纯的六方相β-NaYF₄微晶。Er³⁺/Yb³⁺共掺NaYF₄微晶在980 nm激光泵浦下，观察到强的上转换绿光和红光发射，且上转换发光强度随着Zr⁴⁺离子添加量的增加逐渐增大。

Influence of Zr4+ Doping Impurity on Crystal Phase and Upconversion Luminescence of Er3+/Yb3+ Codoped NaYF4 Microcrystals

Er³⁺/Yb³⁺ codoped NaYF₄ microcrystals were prepared via a facile hydrothermal approach assisted with oleic acid. The cubic-to-hexagonal phase transition and enhancement of up-conversion luminescence of Er³⁺ ions were simultaneously achieved by the gradual addition of Zr⁴⁺ ions in the reaction system. X-ray diffraction and SEM results indicated that the introduction of Zr⁴⁺ ions could remarkably accelerate the cubic-to-hexagonal phase transition process and pure hexagonal NaYF₄ microcrystals were obtained, when Zr⁴⁺ mole fraction reached 5%. Strong green and red up-conversion luminescence of Er³⁺ ions was observed and the up-conversion intensity increased gradually with the addition of Zr⁴⁺ ions.