1. Material and Chemical Research
Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan 30011, Republic of China
2. National Synchrotron Radiation
Research Center, Hsinchu Science Park,
Hsinchu, Taiwan 30076, Republic of China
3. Phosphors Research Laboratory
and Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 30010, Republic of China