1. Institute of Materials Research and Engineering, A*STAR (Agency
for Science, Technology and Research), 2 Fusionopolis Way, #08-03 Innovis, 138634, Singapore
2. LUMINOUS! Centre 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, 639798, Singapore
3. Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore
4. Department of Electrical and Electronics Engineering, Department of Physics, UNAM − Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey