主讲人：程遥   中科院福建物构所副研究员

报告时间：2021年6月16日10：30-12：00

报告地点：物理楼B座304会议室

主办单位：光伏材料省重点实验室

报告摘要：

Thermal quenching above 300 K has been a widespread common sense for photoluminescence.  Luminescence quenching is usually ascribed to the non-radiative relaxation of excited electrons to the ground state of the activators, during which a high temperature always plays a role in pushing the excited electrons towards the quenching channels, leading to thermal quenching. Recently, a size-dependent abnormal thermal enhancement of luminescence above room temperature in lanthanide doped Fluoride nanoparticles has been observed independently by different groups. However, the underlying explanations on such interesting phenomenon are in the debate. Herein, we originally demonstrate that the energy migration induced surface quenching can be suppressed with the increasing temperature, which results in the abnormal thermal enhancement of luminescence. According to the temperature-dependent X-ray diffraction and lifetime analyses, an underlying mechanism based on the effect of thermal lattice expansion on ytterbium mediated energy migration is proposed. This new finding adds new insides to the size effect on the luminescent characteristics of nanoparticles, which could be utilized to construct some unique nanostructure, especially for many important temperature-related purposes, such as thermal sensing technology.

个人简介：

    程遥，男，博士，中科院福建物质结构研究所副研究员，硕士生导师。2007年于中科院福建物质结构研究所获物理化学博士学位；2007-2009年于瑞典斯德哥尔摩大学从事博士后研究；2010-2016回国创办宁波吉瑞陶瓷技术有限公司进行齿科陶瓷产品的研发和生产；2016年10月回归福建物构所工作，开展稀土发光材料研究，主持国家自然科学基金面上项目和福建省自然科学基金面上项目等课题。目前已在Adv. Sci., Appl. Catal. B, Journal of Materials Chemistry A (C), Nanophtonics, Sensor&Actuator B: Chemicals, Nanoscale等重要期刊发表论文50余篇，他引1900余次，H因子23。