报告题目：Rational photon upconversion in core-shell nanoparticles
报告人：王锋博士
报告时间：2016年6月13日（星期一），上午10：00-11:00
报告地点：浙江大学玉泉校区曹光彪楼主楼324会议室
邀请人：乔旭升
报告人简介：
王锋博士现为香港城市大学助理教授。2001年9月毕业于浙江大学并获工学学士学位。同年9月保送浙大学材料科学与工程学系攻读博士研究生，师从王民权和樊先平教授探索镧系掺杂纳米发光纳米材料的合成和性质，期间于2004-2006年进入新加坡国立大学张勇教授课题组尝试镧系掺杂发光纳米微粒在生物标记方面的应用。2006年12月博士毕业后加入新加坡国立大学化学系刘小钢教授课题组从事博士后研究，研究工作拓展到镧系掺杂纳米微粒合成方法的优化，并以此为基础研究镧系离子在纳米微粒中发光机理及控制方法。2012年9月加入香港城市大学，继续深入探索新型发光材料的开发及其应用技术的完善。
近年来共计在Nature, Nat. Mater., Nat. Commun., Chem. Soc. Rev., Angew. Chem. Int. Ed., J. Am. Chem. Soc.， Sci. Rep.等国际学术期刊上发表SCI 收录学术论文40 余篇，他引6000 余次。
报告摘要：
Spectral conversion of light radiation is essential for a variety of modern-day technologies including displays, photovoltaics, data storage, and cancer therapy. In the past decades, a variety of luminescent materials, including organic dyes and semiconductor quantum dots, were developed to realize photon energy conversion in the ultraviolet (UV) to near infrared (NIR) spectral range. However, practical application of these techniques is typically limited by constraints such as toxicity and/or poor stability. In this context, lanthanide-doped upconversion nanoparticles have been developed as a promising alternative to conventional luminescent nanomaterials. By comparison, these nanoparticles offer low cytotoxicity, sharp emission peaks, long-lived excited electronic states, as well as high stability against photo bleaching and chemical degradation. In this talk, I focus on our recent efforts on lanthanide-doped core-shell nanoparticles that are generally composed of a layer-by-layer structure with a set of lanthanide ions incorporated into separate layer. I discuss how to fabricate these nanostructures by wet-chemistry method and how to characterize the nanostructure by a combination of electron microscopy and luminescence spectroscopy. Examples will be given to demonstrate how to enhance multiphoton upconversion emissions for exciting new technological applications.
References:
[1] X. Chen, D. Peng, Q. Ju, F. Wang*, Photon upconversion in core-shell nanoparticles. Chem. Soc. Rev. 2015, 44, 1318.
[2] B. Chen, D. Peng, X. Chen, X. Qiao, X. Fan, F. Wang*, Establishing the Structural Integrity of Core–Shell Nanoparticles against Elemental Migration using Luminescent Lanthanide Probes, Angew. Chem. Int. Ed. 2015, 54, 12788.
[3] X. Chen, L. Jin, W. Kong, T. Sun, W. Zhang, X. Liu, J. Fan, S. F. Yu*, Feng Wang*, Confining energy migration in upconversion nanoparticles towards deep ultraviolet lasing, Nature Communications 2016, 7, 10304, doi: 10.1038/ncomms10304.
