1. Institute of Semiconductor Technology, Braunschweig University of Technology, Hans-Sommer-Straße
66, 38106 Braunschweig, Germany
2. Dongguan Institute of Optoelectronics, Peking University, Bldg No.1, Technology & Innovation Park Songshanhu, 523808 Dongguan, China
3. Osram Opto Semiconductors GmbH, Leibnizstraße 4, 93055 Regensburg, Germany
4. Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz
5-7, 10117 Berlin, Germany
5. HH
Wills Physics Laboratory, University of Bristol, Tyndall Avenue, BS8 1TL Bristol,
England