1. State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials; College of Chemistry, Chemical Engineering and Materials Science; Soochow University; Suzhou 215123 China
2. Jiangsu Key Laboratory of Advanced Laser Materials and Devices; School of Physics and Electronic Engineering; Jiangsu Normal University; Xuzhou 221116 China
3. Department of Physics and Interdisciplinary Program of Biomedical, Mechanical & Electrical Engineering; Pukyong National University; Busan 608-737 Korea