Organic light-emitting diodes with structured cathode

Organic light-emitting diodes with structured cathode

TitleOrganic light-emitting diodes with structured cathode
Publication TypeJournal Article
Year of Publication2007
AuthorsDeang Liu, Michael Fina, Zhaoyang Chen, Xiaobo Chen, Gao Liu, Steven Johnson, Samuel S Mao
JournalApplied Physics Letters
Volume91
Pagination093514-1-3
Date Published08/2007
Keywordsemission
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.