1. School of Materials Science and Engineering University of New South Wales (UNSW) Sydney New South Wales 2052 Australia
2. School of Chemical Engineering University of New South Wales (UNSW) Sydney New South Wales 2052 Australia
3. The Photonics Laboratory Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP) Chinese Academy of Science (CAS) Changchun City 130033 China
4. State Key Laboratory of Luminescence and Applications (SKLLA) Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP) Chinese Academy of Science (CAS) Changchun City 130033 China
5. Faculty of Physics Ludwig Maximilians University of Munich (LMUM) Munich 80539 Germany
6. School of Physics Nano Institute and Australian Centre for Microscopy and Microanalysis The University of Sydney (USYD) Sydney New South Wales 2006 Australia