1. College of Physics and Optoelectronic Engineering Shenzhen Key Laboratory of Photonics and Biophotonics Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen University Shenzhen 518060 P. R. China
2. Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University (PolyU) Hung Hom Hong Kong P. R. China
3. PolyU Shenzhen Research Institute Shenzhen 518057 P. R. China