a
Guangdong Provincial Key Laboratory of Organic Polymer Materials for Electronics, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, P. O. Box 1122, Guangzhou 510650, China
E-mail: xk@gic.ac.cn
;
Fax: +86 20 85231058
;
Tel: +86 20 85232302
b
Graduate School of the Chinese Academy of Sciences, Beijing 100049, China