Supported by the National Natural Science Foundation of China(11174004,50901074);Higher Educational Natural Science Foundation of Anhui Province(KJ2010A012);the"211 Project"of Anhui University
Supported by the National Natural Science Foundation of China(11174004);the Natural Science Key Foundation of Education Departmerct of Anhui Province(KJ2010A012);the Open Foundation of Anhui Key Laboratory of Information Materials and Devices,the"211 Project"of Anhui University