Dr Xu completed his PhD in 2014 from Zhejiang University and postdoctoral studies from University of Maryland and University of Washington. He is now working in Zhejiang University, China. His main research interests are on luminescent materials and devices, including amplifiers, laser, and LEDs, and the interaction of femtosecond laser with materials. He has published over 70 papers in reputed journals, such as Science, Nature Communications, and has been serving as an editorial board member of Scientific Report, Materials & Design.