1. Department of Materials Science and Engineering; National Chung Hsing University; 40227 Taichung Taiwan, R.O.C.
2. Epitaxy R&D First Department; Epileds Technologies, Inc.; 74144 Tainan Taiwan, R.O.C.
3. Department of Materials Science and Engineering; Da-Yeh University; 51591 Changhua Taiwan, R.O.C.
4. Advanced Optoelectronic Technology Center; National Cheng Kung University; 70101 Tainan Taiwan, R.O.C.