1. School of Electronics and Information Technology, Sun Yat-sen University,State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology,Guangzhou,China,510275
2. National Institute for Materials Science,Tsukuba,Ibaraki,Japan,305-0047
3. JEOL Ltd.,EM Business Unit,Akishima,Tokyo,Japan,196-8558
4. University of North Carolina at Chapel Hill,Chapel Hill,NC,USA,27599-3255