Hydrothermal Synthesis of PAA-Coated NaYF4:Yb3+, Er3+ Nanophosphors with Predicted Morphology, Phase and Enhanced Upconversion Luminescence Properties
Hydrothermal Synthesis of PAA-Coated NaYF4:Yb3+, Er3+ Nanophosphors with Predicted Morphology, Phase and Enhanced Upconversion Luminescence Properties
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水热合成 PAA 涂覆的 NaYF4:Yb3、Er3 纳米磷光体，具有预测的形貌、相位和增强的上转换发光特性
DOI：
10.1166/jnn.2018.16384
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发表时间：
2018
影响因子：
--
通讯作者：
Xu Jianxiong
中科院分区：
文献类型：
--
作者：
Tong Chao;Xie Shaowen;Zhou Hu;Li Na;Gong Liang;Jian Jian;Zhang Changfan;Xu Lijian;Xu Jianxiong
在本研究中，通过聚丙烯酸（PAA）介导的水热法合成了具有良好定义的PAA包被的NaYF4:Yb3+， Er3+纳米荧光粉。合理控制初始反应条件，如水热温度、前驱体溶液的pH值、PAA的加入量和PAA配体的分子量等，可以得到不同晶相（α和β）和形态（纳米球、亚微棒、微棒、微管和微棱镜）的NaYF4:Yb3+、Er3+荧光粉的上转化。在980 nm红外光激发下，对合成的NaYF4:Yb3+， Er3+荧光粉的上转换发光性能进行了评价，结果表明，β-相的NaYF4:Yb3+， Er3+荧光粉的上转换发光性能普遍强于α-相的NaYF4:Yb3+， Er3+荧光粉和YF3:Yb3+， Er3+正正交相的荧光粉。此外，空心微管形态的β相NaYF4:Yb3+， Er3+荧光粉比其他形态的荧光粉具有更高的上转换发光强度。这可能是由于微管具有更大的表面积（内表面和外表面），在类似的激发条件下提高了吸收效率，从而产生更高的发光强度。本研究结果可为其他稀土氟化物络合物的精确控制生长提供参考，并为探索组分、相和形态依赖的上转换发光特性提供参考。
In this study, well-defined PAA-coated NaYF4:Yb3+, Er3+ nanophosphors were synthesized via a poly(acrylic acid) (PAA) mediated hydrothermal process. The rational control of initial reaction conditions, such as hydrothermal temperature, pH value of precursor-solution, added amount of PAA, and molecular weight of PAA ligand, resulted in upconversion of NaYF4:Yb3+, Er3+ phosphors with varying crystal phases (α and β) and morphologies (e.g., nanosphere, submicrorod, microrod, microtube, and microprism). By assessing the upconversion luminescent properties of the synthesized NaYF4:Yb3+, Er3+ phosphors upon excitation by 980 nm infrared light, it was demonstrated that the β-phase NaYF4:Yb3+, Er3+ phosphors generally presented stronger upconversion luminescent than α-phase NaYF4:Yb3+, Er3+ phosphors and orthorhombic phase of YF3:Yb3+, Er3+ sample. Additionally, the β-phase NaYF4:Yb3+, Er3+ phosphors with hollow microtube morphology presented higher upconversion luminescent intensity than phosphors of other morphologies. This may be due to microtubes having larger surface area (inner and outer surfaces), which promoted the absorption efficiency under similar excitation conditions, therefore generating higher luminescent intensity. Findings form this study suggest for precisely controlled growth of other complex rare earth fluoride compounds and provide a reference for exploration of component-, phase- and morphology-dependent upconversion luminescence properties.