1. Department of Electrical and Electronics Engineering, Department of Physics, UNAM– Institute of Materials Science and Nanotechnology, and The National Nanotechnology Research Center, Bilkent University, Ankara 06800, Turkey
2. Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Mathematical Sciences, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore