1. Guangxi Key Laboratory of Optical and Electronic Materials and Devices College of Materials Science and Engineering Guilin University of Technology Guilin 541004 P. R. China
2. CNRS CEMHTI UPR3079 Univ. Orléans F-45071 Orléans France
3. College of Chemistry and Bioengineering Guilin University of Technology Guilin 541004 P. R. China