Organic light-emitting diodes with structured cathode
Publication Type
Journal Article
Date Published
08/2007
Authors
Abstract
Organic light-emitting diode (OLED) devices were fabricated with a structured polymer-cathode interface. The devices have a layered structure indium tin oxide/poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate)/poly(2-methoxy-5-[(2'-ethylhexyl)oxy]-p-phenylenevinylene)/Al . The light-emitting polymer layers were patterned via a stamp imprinting process, followed by vapor deposition of the cathode. Devices employing the structured cathode showed improved electron injection and increased brightness when compared to conventional flat cathode devices. Electrostatic modeling of the structured cathode geometry revealed localized increase in electric field leading to enhanced electron tunneling through the polymer-cathode interface. Thus, improved OLED performance was demonstrated from cathode microstructuring.
Journal
Applied Physics Letters
Volume
91
Year of Publication
2007