1. Institute of Photonics and Optoelectronics National Taiwan University No. 1, Section 4, Roosevelt Road Taipei 10617 Taiwan
2. Department of Materials Science National University of Tainan No. 33, Section 2, Shu-Lin Street Tainan 70005 Taiwan
3. Department of Energy and Refrigerating Air-conditioning Engineering Tungnan University 152 Beishen Road, Section 3 Taipei 22202 Taiwan
4. Department of Electrical Engineering National Taiwan University No. 1, Section 4, Roosevelt Road Taipei 10617 Taiwan