Feng Wang

City University of Hong Kong

Abstract

Lanthanide-doped upconversion nanoparticles that convert low energy excitation into higher-energy emissions are promising for applications in diverse fields ranging from biology and life science to information technology. However, practical use of these nanomaterials is typically constrained by limited emission brightness associated with low concentration of optical centers (or dopants) in most nanoparticles. As dopant concentration increases, interaction of optical centers arises due to a reduced inter-dopant distance, leading to severe concentration quenching. In this talk, I focus on our recent efforts to alleviate concentration quenching in lanthanide-doped nanoparticles through core-shell nanostructural engineering. Examples will be given to demonstrate how to enhance multiphoton upconversion emission for exciting new technological applications.

References

1. Chen, X.; Peng, D.; Ju, Q.; Wang, F.* Photon upconversion in core-shell nanoparticles,Chem. Soc. Rev.2015, 44, 1318.

2.Chen, X.; Jin, L.; Kong, W.; Sun, T.; Zhang, W.; Liu, X.; Fan, J.; Yu, S. F.;* Wang, F.* Confining energy migration in upconversion nanoparticles towards deep ultraviolet lasing,Nature Communications2016, 7, 10304.

3. Chen, B.; Liu, Y.; Xiao, Y.; Chen, X.; Li, Y.; Li, M.; Qiao, X.; Fan, X.; Wang, F.* Amplifying Excitation-Power Sensitivity of Photon Upconversion in a NaYbF4:Ho Nanostructure for Direct Visualization of Electromagnetic Hotspots,J. Phys. Chem. Lett.2016, 7, 4916.

4. Lin. X; Chen, X; Zhang, W.; Sun, T.; Fang, P.; Liao, Q.; Chen, X.; He, J.; Liu, M.; Wang, F.;* Shi, P.* Core?Shell?Shell Upconversion Nanoparticles with Enhanced Emission for Wireless Optogenetic Inhibition,Nano Lett.2018, 18, 10.1021/acs.nanolett.7b04339.

Biography

Dr. Feng Wang is an Associate Professor in the Department of Materials Science and Engineering at City University of Hong Kong. He received his BE (2001) and PhD (2006) degrees in Materials Science and Engineering from Zhejiang University under the supervision of Prof. Minquan Wang and Prof. Xianping Fan. He then carried out postdoctoral research work with Prof. Xiaogang Liu at the National University of Singapore and the Institute of Materials Research and Engineering in Singapore. His research interests include the design, synthesis, mechanistic investigation, and applicationof micro/nanostructured luminescent materials.