Effect of electrodes properties on OLED performances

Mario Petrosino; Paolo Vacca; Riccardo Miscioscia; Giuseppe Nenna; Carla Minarini; Alfredo Rubino

doi:10.1117/12.722032

12 June 2007 Effect of electrodes properties on OLED performances

Mario Petrosino, Paolo Vacca, Riccardo Miscioscia, Giuseppe Nenna, Carla Minarini, Alfredo Rubino

Proceedings Volume 6593, Photonic Materials, Devices, and Applications II; 659311 (2007) https://doi.org/10.1117/12.722032
Event: Microtechnologies for the New Millennium, 2007, Maspalomas, Gran Canaria, Spain

Abstract

The effects induced by different electrical contacts, both for the anode and for the cathode, have been analyzed in Organic Light Emitting Diodes (OLEDs). The properties of anode electrode, Indium Tin Oxide (ITO), have been varied through different surface treatments allowing roughness control, carbon impurity removal, spikes decrement. These induce changes of ITO surface chemical-physical characteristics as roughness, surface energy and surface polarity. OLEDs manufactured employing treated ITO have showed an improvement of 25 times in luminance. Thermionic injection model has been used to estimate decrement in effective hole barrier at ITO-organic layer. It is shown that this effect is correlated to ITO surface energy. The second step of process optimization has concerned the cathode electrode investigation. In order to perform this task, Al, Ca/Al, Ag, Mg/Ag have been used to realize different ITO/PEDOT:PSS/PF6/Alq₃/Metal OLEDs. Measurements of electrical and optical behaviour have been performed. A thermionic injection model, with and without Schottky barrier decrement, has been used to calculate the change of the cathode electrical barrier.

Citation Download Citation

Mario Petrosino, Paolo Vacca, Riccardo Miscioscia, Giuseppe Nenna, Carla Minarini, and Alfredo Rubino "Effect of electrodes properties on OLED performances", Proc. SPIE 6593, Photonic Materials, Devices, and Applications II, 659311 (12 June 2007); https://doi.org/10.1117/12.722032

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