SCL's Veljko Janković successfully defended his PhD thesis entitled Exciton Dynamics at Photoexcited Organic Heterojunctions at the Faculty of Physics, University of Belgrade. The thesis was done in SCL under supervision of Dr Nenad Vukmirović. The members of the thesis defense committee are Dr Nenad Vukmirović (Research Professor, Institute of Physics Belgrade), Prof. Dr Ivanka Milošević (Professor, Faculty of Physics), and Prof. Dr Đorđe Spasojević (Professor, Faculty of Physics) were impressed by Veljko's results and the presentation of the thesis.