1. State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 P. R. China
2. State Key Laboratory of Luminescence and Applications Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun Jilin 130033 P. R. China
3. Department of Chemistry and Physics State University of New York at Stony Brook New York 11794‐3400 USA
4. College of Chemistry Jilin University Changchun Jilin 130012 P. R. China