Nonlinear Spectral and Lifetime Management in Upconversion Nanoparticles by Controlling Energy Distribution
Nonlinear Spectral and Lifetime Management in Upconversion Nanoparticles by Controlling Energy Distribution
复制标题
通过控制能量分布进行上转换纳米粒子的非线性光谱和寿命管理
DOI：
10.1039/c6nr00812g
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发表时间：
2016
期刊：
影响因子：
6.7
通讯作者：
Xiaogang Liu
中科院分区：
文献类型：
--
作者：
Yu Wang;Renren Deng;Xiaoji Xie;Ling Huang;Xiaogang Liu
在过去的十年里，掺镧上转换纳米粒子的光学调谐引起了人们的极大关注，因为这一发展允许在能量转换、材料科学和生物成像方面取得新的进展。在这里，我们提出了一种合理的方法，通过调整上转换纳米粒子的非线性光学性质来控制上转换纳米粒子中稀土元素发射的光谱分布和寿命。我们发现，在稀土基晶格中加入能量分配体，如表面缺陷或额外的掺杂剂，改变了激发敏化剂的衰变行为，从而显著提高了发射体对激发功率的灵敏度。这项工作提供了对纳米粒子中上转换现象的机理理解的洞察力，也为将这些纳米材料用于光子应用提供了令人兴奋的新机会。
Optical tuning of lanthanide-doped upconversion nanoparticles has attracted considerable attention over the past decade because this development allows the advance of new frontiers in energy conversion, materials science, and biological imaging. Here we present a rational approach to manipulating the spectral profile and lifetime of lanthanide emission in upconversion nanoparticles by tailoring their nonlinear optical properties. We demonstrate that the incorporation of energy distributors, such as surface defects or an extra amount of dopants, into a rare-earth-based host lattice alters the decay behavior of excited sensitizers, thus markedly improving the emitters’ sensitivity to excitation power. This work provides insight into mechanistic understanding of upconversion phenomena in nanoparticles and also enables exciting new opportunities of using these nanomaterials for photonic applications.