1. College of Physics and Optoelectronic Engineering, 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 The Hong Kong Polytechnic University (PolyU) Hung Hom Hong Kong P. R. China
3. PolyU Shenzhen Research Institute Shenzhen 518057 P. R. China
4. Key Laboratory of Environmental Functional Materials Technology and Application of Wenzhou City Institute of New Materials and Industry College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 P. R. China