1. Department of ChemistryNational Tsing Hua University Hsinchu 30013 Taiwan
2. Institute of Optoelectronic SciencesNational Taiwan Ocean University Keelung 202 Taiwan
3. Department of ChemistryTamkang University New Taipei 25137 Taiwan
4. Department of Chemistry and Instrumentation CenterNational Taiwan University Taipei 10617 Taiwan
5. Department of Materials Science and Engineering and Department of ChemistryCity University of Hong Kong Hong Kong SAR