1. Key Laboratory of Green Chemistry Materials in University of Yunnan ProvinceNational and Local Joint Engineering Research Center for Green Preparation Technology of Biobased MaterialsSchool of Chemistry and EnvironmentYunnan Minzu University Kunming 650500 P. R. China
2. MOE Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of ChemistrySun Yat‐Sen University Guangzhou 510275 P. R. China
3. Department of PhysicsGeorgia Southern University Statesboro Georgia 30460 USA
4. Guangdong Institute of Semiconductor Industrial Technology Guangzhou 510650 P. R. China
5. Institute of PhysicsUniversity of Tartu W. Ostwald Str. 1 Tartu 50411 Estonia
6. Viňa Institute of Nuclear SciencesUniversity of Belgrade P.O. Box 522 Belgrade 11001 Serbia