Hydrothermal synthesis of hexagonal lanthanide-doped LaF3 nanoplates with bright upconversion luminescence
Hydrothermal synthesis of hexagonal lanthanide-doped LaF3 nanoplates with bright upconversion luminescence
复制标题
水热合成具有明亮上转换发光的六方稀土掺杂LaF3纳米片
DOI：
10.1088/0957-4484/19/37/375702
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发表时间：
2008-09-17
期刊：
影响因子：
3.5
通讯作者：
Huang, Chunhui
中科院分区：
文献类型：
--
作者：
Hu, He;Chen, Zhigang;Huang, Chunhui
合成了平均直径约为15 nm的六方Yb/Er或Yb/Ho共掺LaF3纳米片。研究发现，包覆剂、水热温度和时间对最终产物的形状控制起着关键作用。提出了一种可能的生长机制，包括离子交换、“爆核”和“升温”生长。H-1核磁共振谱和傅里叶变换红外光谱表明，纳米板材表面包覆了油酸配体。这些六角形纳米板显示了形成自组装二维纳米阵列的能力。此外，在980 nm连续波激发下，LaF3：12%Yb，3%Er纳米板显示出明亮的橙色发光(绿色在515-556 nm之间，红色在640-675 nm之间)，LaF3：20%Yb，1%Ho纳米板在530-554 nm之间有几乎纯的绿色上转换发光。上转换发光强度随时间和水热温度的升高而增强。对于明亮的上转换发光，所制备的样品在彩色显示、构建纳米器件和作为生物标记方面具有潜在的应用前景。
Hexagonal Yb/Er or Yb/Ho co-doped LaF3 nanoplates with uniform morphology have been synthesized with an average diameter of similar to 15 nm. It was found that the coating reagent, hydrothermal temperature and time play critical roles in the control of the shape of the final products. A possible growth mechanism including ion exchange, 'burst-nucleation', and 'heat-up' growth is proposed. H-1 NMR spectra and Fourier transform infrared (FTIR) spectra indicate that the surface of the nanoplates is coated with oleic acid ligands. Those hexagonal nanoplates display the capability of forming self-assembled two-dimensional nanoarrays. Moreover, under continuous-wave excitation at 980 nm, the LaF3:12% Yb, 3% Er nanoplates exhibited bright orange emission (a combination of green between 515 and 556 nm and red between 640 and 675 nm) and the LaF3:20% Yb, 1% Ho nanoplates had nearly pure green upconversion luminescence between 530 and 554 nm. The intensity of upconversion luminescence increased with time and increase of the hydrothermal temperature. For the bright upconversion luminescence, the as-prepared samples show potential applications in color displays, the building of nanodevices and as biolabels.