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E-Mail IMAGE: Prof. Karl Leo (right) presents his research to former German President Joachim Gauck (center) and former Saxon Prime Minister Stanislaw Tillich (left). view more Credit: Bundesregierung/Steffen Kugler Prof. Karl Leo, director of the Institute of Applied Physics at TU Dresden is a semiconductor physicist at heart. His main interests are novel semiconductor systems such as semiconducting organic thin films, with a special focus on understanding fundamental device principles and their optical response. He has been fascinated by organic light-emitting diodes (OLEDs) since seeing his first one in 1991. It was a polymer OLED and it had a lifetime of a few minutes, Leo says. To see how it went from those few minutes to products like today s television screens was a wonderful development. ....