1. Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Science Heilongjiang University Harbin 150080 China
2. Department of Physics and Engineering Physics The University of Tulsa Tulsa OK 74104 USA
3. School of Physics and Electronic Engineering Linyi University Linyi 276005 China
4. College of Electronic Science and Engineering Jilin University Jilin 120012 China