1. Collaborative Innovation Center for Optoelectronic Science and Technology Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 P. R. China
2. College of Chemistry and Environmental Engineering Shenzhen University Shenzhen 518060 P. R. China
3. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 P. R. China
4. Research School of Engineering The Australian National University Canberra ACT 2601 Australia