1. State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering; Jilin University; Changchun Jilin 130012 China
2. Key Laboratory of Mobile Materials MOE; State Key Laboratory of Automotive Simulation and Control, and College of Materials Science; Jilin University; Changchun 130012 China
3. Department of Chemistry and Physics; Louisiana State University; Shreveport LA 71115 USA