1. State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Technology, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
2. Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States
3. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
4. Department of Materials Science and Engineering, The NUANCE Center, Northwestern University, Evanston, Illinois 60208, United States
5. Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
6. Flexterra Corporation, 8025 Lamon Avenue, Skokie, Illinois 60077, United States