State Key Laboratory of Integrated Optoelectronics;
College of Electronic Science and Engineering;
Jilin University;
2699 Qianjin Street;
Changchun 130012;
China;
State Key Laboratory of Infrared Physics;
Shanghai Institute of Technical Physics;
Chinese Academy of Sciences;
500 Yutian Road;
Shanghai 200083;
China;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
Department of Materials Science and Engineering;
College of Engineering;
Key Laboratory of Polymer Chemistry and Physics of Ministry of Education;
Peking University;
Beijing 100871;
China;