1. Department of Applied Chemistry, Providence University, Taichung 43301, Taiwan
2. Institute of Lighting and Energy Photonics, National Chiao Tung University, Tainan 71150, Taiwan
3. Department of Photonics Engineering, Yuan Ze University, Chung-Li 32003, Taiwan
4. Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan