1. Laboratory of Nano-Bioengineering, Moscow Engineering Physics Institute, 115409 Moscow, Russian Federation
2. Technological Platform Semiconductor Nanocrystals, Institute of Molecule Medicine, Trinity College Dublin, Dublin 8, Ireland
3. Physical Chemistry, Technical University of Dresden, 01069 Dresden, Germany
4. Centro de Fisica de Materiales (CSIC-UPV/EHU) and International Physics Center (DIPC), Donostia-San Sebastian, IKERBASQUE, Basque Foundation for Science, Bilbao, Spain