1. LUMINOUS! Center
of Excellence for Semiconductor Lighting and Display,
School of Electrical and Electronics Engineering, Physics and Applied
Physics Division, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 639798,
Singapore
2. Department
of Physics, Department of Electrical and
Electronics Engineering, UNAM - National Nanotechnology
Research Center and Institute of
Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
3. Department of Physics
and Astronomy, Ohio University, Athens, Ohio 45701, United States