科学技术与应用

稀土掺杂纳米材料的单色荧光发射及调制机理

邓 子石

湖南科技大学 物理与电子科学学院

DOI: https://doi.org/10.59429/kxjsyy.v3i4.15194

Keywords: 稀土掺杂；上转换发光；纳米颗粒；荧光调制；能量传递

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Abstract

稀土掺杂上转换纳米材料因其独特的光学性质在生物成像、光电器件及传感等领域具有广阔应用前景。本文 设计合成了核 - 壳 - 壳结构的 NaYF₄: 5%Er@NaLuF₄: 20%Yb@NaYF₄ 纳米颗粒，通过调控 Yb³⁺ 掺杂浓度实现上转换 荧光从绿色到红色的选择性发射。透射电镜和 X 射线衍射表征表明所得纳米颗粒呈六方相结构，粒径分布均匀。当 Yb³⁺ 掺杂浓度为 20% 时，样品在 980 nm 激光激发下产生信噪比为 98 的纯绿光发射；当 Yb³⁺ 掺杂浓度提高至 90% 时，发射光谱转变为信噪比为 105 的纯红光发射。基于能级布居和能量传递动力学，提出了浓度调控上转换路径的 物理机制，为稀土纳米探针的荧光颜色工程提供了新思路。

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References

[1] Auzel F. Upconversion and anti-Stokes processes with f and d ions in solids[J]. Chemical Reviews, 2004, 104(1): 139-174.

[2] Wang F, Liu X G. Upconversion multicolor fine-tuning: visible to near-infrared emission from lanthanide-doped NaYF₄ nanoparticles[J]. Journal of the American Chemical Society, 2008, 130(17): 5642-5643.

[3] Chen G Y, Qiu H L, Prasad P N, et al. Upconversion nanoparticles: design, nanochemistry, and applications in theranostics[J]. Chemical Reviews, 2014, 114(10): 5161-5214.

[4] Zhou B, Shi B Y, Jin D Y, et al. Controlling upconversion nanocrystals for emerging applications[J]. Nature Nanotechnology, 2015, 10(11): 924-936.

[5] Suyver J F, Grimm J, van Veen M K, et al.Upconversion spectroscopy and properties of NaYF₄ doped with Er³⁺, Tm³⁺ and/or Yb³⁺[J]. Journal of Luminescence, 2006,117(1): 1-12.

[6] Pollnau M, Gamelin D R, Lüthi S R, et al. Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems[J]. Physical Review B, 2000,61(5): 3337-3346.

[7] Li Z Q, Zhang Y. An efficient and user-friendly method for the synthesis of hexagonal-phase NaYF₄:Yb, Er/Tm nanocrystals with controllable shape and upconversion fluorescence[J]. Nanotechnology, 2008, 19(34): 345606.

[8] Wang J, Deng R R, Macdonald M A, et al. Enhancing multiphoton upconversion through energy migration at the interface of core-shell nanocrystals[J]. Nature Materials, 2014,13(2): 157-162.

[9] Wen H L, Zhu H, Chen X, et al. Upconverting near-infrared light through energy management in core-shell-shell nanoparticles[J]. Angewandte Chemie International Edition,2013, 52(50): 13419-13423.