1. Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of Technology Guangzhou 510006 P. R. China
2. Synthesis Laboratory Chemical Research Division Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi Dhaka 1205 Bangladesh
3. Chinese Research Academy of Environmental Sciences No.8, Dayangfang, Beiyuan Beijing P. R. China
4. Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates (South China University of Technology) Guangzhou 510640 P. R. China