Wang Yu, Deng Renren, Xie Xiaoji, Huang Ling, Liu Xiaogang
Department of Chemistry, National University of Singapore, Singapore 117543, Singapore.
Key Laboratory of Flexible Electronics, Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China.
Nanoscale. 2016 Mar 28;8(12):6666-73. doi: 10.1039/c6nr00812g.
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.
在过去十年中，镧系元素掺杂的上转换纳米粒子的光学调谐引起了相当大的关注，因为这一进展为能量转换、材料科学和生物成像等新领域的发展提供了可能。在此，我们提出一种合理的方法，通过调整镧系元素掺杂上转换纳米粒子的非线性光学性质来控制其光谱轮廓和发射寿命。我们证明，将能量分布剂（如表面缺陷或额外的掺杂剂）引入稀土基主体晶格中，可以改变激发敏化剂的衰减行为，从而显著提高发射体对激发功率的敏感度。这项工作为深入理解纳米粒子中的上转换现象提供了思路，也为将这些纳米材料用于光子应用带来了令人兴奋的新机遇。
