1. Key Laboratory of Luminescence and Optical Information Ministry of Education Beijing Jiaotong University Beijing 100044 P. R. China
2. Collaborative Innovation Center of Light Manipulations and Applications in Universities of Shandong School of Physics and Electronics Shandong Normal University Jinan 250014 P. R. China
3. Organic Optoelectronic Materials Laboratory Department of Chemistry College of Science Korea University Seoul 02841 Republic of Korea
4. College of Physics and Electronic Engineering Chongqing Normal University Chongqing 401331 P. R. China
5. School of Materials Science and Engineering Engineering Research Center of Electronic Information Materials and Devices Ministry of Education Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology 1st Jinji Road Guilin 541004 China