Dresden 2006 – scientific programme
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HL: Halbleiterphysik
HL 50: Poster II
HL 50.54: Poster
Thursday, March 30, 2006, 16:30–19:00, P3
Design, fabrication and characterization of microcavity OLED structures — •Hannes Gothe, Robert Gehlhaar, Hartmut Fröb, Vadim G. Lyssenko, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany, www.iapp.de
Microcavity OLEDs exhibit a directional emission and efficiency enhancement. We report on a microcavity structure consisting of a distributed Bragg reflector (DBR) and a metal mirror. The SiO2/TiO2-DBR is fabricated by reactive electron-beam evaporation and covered with an electrically conductive film of indium-tin-oxide (ITO). Due to the comparably high absorption, the optical properties of the microcavity are strongly dependent on the ITO layer. By annealing and structure optimization, which reduces the electromagnetic field intensity in the ITO layer, we counteract the absorbance and decrease the optical losses within the resonator. The results of linear optical measurements are explained by transfer-matrix calculations.