1. Department of Electrical
and Electronics Engineering, Department of Physics, UNAM
− Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
2. LUMINOUS! Center of Excellence for Semiconductor
Lighting and Displays, TPI − The Photonics Institute, School
of Electrical and Electronic Engineering, School of Physical and Materials
Sciences, Nanyang Technological University, Singapore 639798, Singapore