1. Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, 10608,
Taiwan
2. Institute of Physics, Academia Sinica,
Nankang, Taipei 11529, Taiwan
3. Department of Materials
Science, National University of Tainan,
Tainan 70005, Taiwan
4. Research
Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
5. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan