Institute of Optoelectronics Technology Northern Jiaotong University Beijing 100044Laboratory of Excited State Processes Changchun Institute of Physics Chinese Academy of Sciences Changchun 130021Institute of Material Physics Tianjin Institute of Technology Tianjin 300191;
Institute of Optoelectronics Technology Northern Jiaotong University Beijing 100044;
Institute of Optoelectronics Technology Northern Jiaotong University Beijing 100044;
Department of Electronical Engineering Jilin University Changchun 130023;
Institute of Optoelectronics Technology Northern Jiaotong University Beijing 100044Laboratory of Excited State Processes Changchun Institute of Physics Chinese Academy of Sciences Changchun 130021Institute of Material Physics Tianjin Institute of Technology Tianjin 300191;
Institute of Optoelectronics Technology Northern Jiaotong University Beijing 100044Laboratory of Excited State Processes Changchun Institute of Physics Chinese Academy of Sciences Changchun 130021;
