1. The Cultivation Base for State Key Laboratory & College of Chemical Science and Engineering, Qingdao University, No. 308, Ningxia Road, Qingdao 266071, P. R. China
2. College
of Physics, Qingdao University, No. 308, Ningxia Road, Qingdao, 266071, P. R. China
3. Key
Laboratory of Photonics Materials and Technology in University of
Shandong, Qingdao University, No. 308, Ningxia Road, Qingdao 266071, P.R. China
4. Department
of Chemistry and Bioengineering, Tampere University of Technology, P. O. Box 541, FIN-33101 Tampere, Finland