1. Department
of Electrical and Electronics Engineering, Department of Physics and
UNAM−National, Nanotechnology Research Center, Institute of
Materials Science and Nanotechnology, Bilkent University, TR-06800 Bilkent, Ankara, Turkey
2. Institute
for Organic Chemistry, Johannes Gutenberg University, Duesbergweg
10-14, 55128 Mainz, Germany
3. Department
of Physics, Abant Izzet Baysal University, Bolu 14280, Turkey
4. 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 Nanotechnology, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore