1. Department of Physics, University at Buffalo SUNY, Buffalo, New York 14260, United States
2. Luminous! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering and Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 639798
3. Department of Electrical and Electronics Engineering and Department of Physics, UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey
4. Department of Chemistry and Physics, Southeast Missouri State University, Cape Girardeau, Missouri 63701, United States
5. Department of Physics and Astronomy, University of Wyoming, Laramie, Wyoming 82071, United States
6. Department of Physics, St. Bonaventure University, St. Bonaventure, New York 14778, United States
7. Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
8. Department of Metallurgical and Materials Engineering, Atilim University, Ankara 06830, Turkey
9. Empa−Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland