1. State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P.R. China
2. Department of Chemistry, Rice University, Houston, Texas 77005, United States
3. Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
4. Institute of Theoretical Chemistry, Jilin University, Changchun 130021, P.R. China
5. Department of Physics & Astronomy, Rice University, Houston, Texas 77005, United States
6. Department of Material Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
7. Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States