Outcoupling Enhancement of OLEDs With a Randomly Distributed ITO Pattern Fabricated by Maskless Wet Etching Method

Author

Ji-Hyang Jang ; Min-Cheol Oh

Author_Institution

Sch. of Electr. Eng., Pusan Nat. Univ., Busan, South Korea

Volume

9

Issue

11

fYear

2013

fDate

Nov. 2013

Firstpage

900

Lastpage

903

Abstract

To outcouple the photons trapped in OLEDs, the effect of a rough ITO surface is investigated. The rough surface is obtained by simple maskless wet etching producing a randomly distributed nano-pattern. The power efficiency is improved by 54%, and further enhanced to 83% with a microlens array. As the pattern located between the organic layer and the ITO anode overlaps strongly with the guided mode, it results in a strong scattering rather than the diffraction, so that the device produces no angular dependence or spectral shift. Electrical property and the lifetime of the device are not affected by the etched ITO.

Keywords

electrochemical electrodes; etching; indium compounds; microdisplays; microlenses; nanofabrication; organic light emitting diodes; photons; rough surfaces; wetting; ITO; OLED; anode; efficiency 54 percent; efficiency 83 percent; maskless wet etching method; microlens array; outcoupling enhancement; photon; random distributed ITO nanopattern fabrication; rough ITO surface; Indium tin oxide; Optical surface waves; Organic light emitting diodes; Polymers; Rough surfaces; Surface roughness; Surface treatment; Displays; lighting; optical device fabrication; organic light emitting diodes (OLEDs);

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2013.2265696

Filename

6528024