1. Karlsruhe Institute of Technology
(KIT), Institut für Anorganische Chemie, Engesserstraße 15, D-76131 Karlsruhe, Germany
2. Department of Optoelectronic
Engineering, National Dong Hwa University, Hualien 97401, Taiwan
3. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan