学术报告：Upconversion Nanocrystals: A New Class of Luminescent Bioprobes
题目：Upconversion Nanocrystals: A New Class of Luminescent Bioprobes报告：刘小钢教授（新加坡国立大学)
时间：2012年5月25日 下午2:00
地点：嘉定园区学术活动中心一楼多功能厅
报告人简介：
Dr. Xiaogang Liu earned his BS degree (1996) in Chemical Engineering from Beijing Technology and Business University, China. He received his MS degree (1999) in Chemistry from East Carolina University in Greenville, North Carolina under the direction of Prof. John Sibert and completed his PhD (2004) in Chemistry at Northwestern University in Evanston, Illinois under the supervision of Prof. Chad Mirkin. In the same year he became a postdoctoral fellow in the group of Prof. Francesco Stellacci at MIT. He joined the faculty of the National University of Singapore in 2006. He holds a joint appointment with the Institute of Materials Research and Engineering, Agency for Science, Technology and Research. His interests include nanomaterials synthesis, supramolecular chemistry, and surface science for catalysis, sensors and biomedical applications.
报告简介:
Lanthanide-doped inorganic nanocrystals typically comprise an insulating host material and lanthanide dopant ions embedded in the host lattice. The luminescence of lanthanide-doped nanocrystals primarily originates from intra-configurational 4f electron transitions within the localized dopant ions. In stark contrast to quantum dots, quantum confinement effects are typically not expected in lanthanide-doped nanocrystals due to small Bohr radius of the exciton in the host, as well as weak interaction between the 4f electrons of the dopant ions and the host material. As a result, the luminescence properties of lanthanide-doped nanocrystals closely resemble those of the bulk counterparts. The emission profiles of lanthanide-doped nanocrystals are usually manipulated by varying dopant compositions and concentrations in the host lattice. In this talk, I will present a doping principle that is capable of altering nanocrystal growth processes with simultaneous control over crystallographic phase and size of the nanocrystals. I will also discuss our recent efforts in developing novel photon upconversion schemes based on energy migration processes and utilizing upconversion nanocrystals as novel luminescent labels for biological applications.
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