Organic light-emitting diodes with structured cathode

Deang Liu, Michael Fina, Zhaoyang Chen, Xiaobo Chen, Gao Liu, Steven Johnson, Samuel S. Mao

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

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.

Original languageBritish English
Article number093514
JournalApplied Physics Letters
Volume91
Issue number9
DOIs
StatePublished - 2007

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