Sequential Growth of Uniform β-NaYF₄@β-NaLnF₄ (Ln = Y, Lu, Yb) Microcrystals with Luminescent Properties of Multicolor Tuning and Dual-Mode Emission.
Sequential Growth of Uniform β-NaYF₄@β-NaLnF₄ (Ln = Y, Lu, Yb) Microcrystals with Luminescent Properties of Multicolor Tuning and Dual-Mode Emission.
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具有多色调谐和双模式发射发光特性的均匀β-NaYF4@β-NaLnF4 (Ln = Y, Lu, Yb) 微晶的连续生长
DOI：
10.3390/nano7120448
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发表时间：
2017-12-14
期刊：
影响因子：
--
通讯作者：
Ming C
中科院分区：
文献类型：
--
作者：
Ju D;Song F;Han Y;Cui W;Zhou A;Liu S;Wang X;Feng M;Ming C
采用水热法合成了以六方相NaYF 4：Er/Yb微米棒为核，六方相NaLnF 4（NaYbF 4，NaLuF 4：Yb/Tm，NaYF 4：Yb/Er，NaYF 4：Eu）为壳的均匀核壳结构化合物。这些微尺度的核壳结构提供了一个平台，空间限制的光学过程，同时具有高的发光效率。壳层厚度可以通过调节壳层前驱体的量来控制，壳层前驱体的量对壳层掺杂离子的发射强度和核壳上转换发光（UCL）的发射颜色有显著影响。在NaYF4@NaLnF4（Ln = Y，Lu，Yb）微米棒的芯层和壳层中以不同的掺杂浓度掺杂一系列稀土离子，在单晶水平上实现了上转换（UC）发射和双模发射的颜色调谐，从而使核-壳微晶在光子学和安全标记中得到有效利用。这项研究提出了一类新的发光材料在微观领域。
We synthesized the uniform core-shell microstructured compounds with hexagonal phase NaYF4:Er/Yb microrods as the core and hexagonal phase NaLnF4 (NaYbF4, NaLuF4:Yb/Tm, NaYF4:Yb/Er, NaYF4:Eu) as the shell based on the hydrothermal reaction. These microscale core-shell structures provided a platform for the spatially confining optical process while possessing high luminescence efficiency. The thickness of the shell could be controlled by adjusting the amounts of shell precursor, which significantly affected the intensity of the shell dopant ions emission and the emission color of core-shell upconversion luminescence (UCL). The uniform NaYF4@NaLnF4 (Ln = Y, Lu, Yb) microrods, with a series of rare-earth ions doped into the core and shell layer at various doping concentrations, achieved color-tuning of the upconversion (UC) emission and dual-mode emission at the single-microcrystal level, thus allowing the efficient utilization of core-shell microcrystals in the photonics and security labeling. This study suggests a new class of luminescent materials in the microscopic field.
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