Regensburg 2007 – wissenschaftliches Programm
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.77: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Inverted OLED based on RT Pulsed Plasma Deposition of IMO top-anode — •Eugenio Lunedei1, Yiqiang Zhan1, Valentin Dediu1, Peter Nozar1, and Carlo Taliani1,2 — 1ISMN - CNR — 2Organic Spintronics s.r.l., Via Gobetti 101, 40129 Bologna, Italy
The advent of a new Room Temperature Pulsed Plasma Deposition (RT PPD) technique opens the possibility to integrate the use of Transparent Conducting Oxides (TCO) with soft materials (1). We applied PPD to create transparent and conducting electrodes on organic light emitting devices. Aim of the research is to develop inverted (i.e. with reversed layer ordering) top-emitting diode structure with a transparent anode; traditional OLEDs use a transparent bottom electrode made of Indium Tin Oxide (ITO) on glass to let the emitted light exit from the device. Nevertheless, such a structure is not suitable to be directly integrated on the n-type FET-driven backplanes used as circuit in active-matrix OLED displays. The deposition of TCOs as top layer on sandwich of organics is crucial to fabricate efficient inverted OLEDs. Radio-frequency sputtering, up to now the process mostly used to create the top electrode, causes serious degradation of organics. We used RT PPD to deposit TCOs as IMO (Indium Molybdenum Oxide) and ZnO on vacuum-sublimed inverted devices (Al/AlQ3/NPB/IMO). These new materials offer flat surface, very high transparency (exceding 90%) in VIS-IR and good hole injection properties (sheet resistance 40Ω ). Experimental results show no damage of underlaying organics arising from PPD and low turn-on voltages of devices.
(1) Organic Spintronics: Patent Pending (2006).