Doping-Free Inverted Top-Emitting Organic Light-Emitting Diodes With High Power Efficiency and Near-Ideal Emission Characteristics

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Inverted top-emitting organic light-emitting diodes (ITOLEDs) with high power efficiency and near-ideal emission characteristics are demonstrated by using the combination of the following: 1) an electron-injection layer composed of Cs(2)CO(3), which lowers the turn-on voltage; 2) an electron-transporting layer with optimal electron mobility, which enhances the electron current and thus improves the carrier balance; and 3) a dielectric/metal/dielectric multilayer electrode that works as a damage-free top transparent anode optimized to achieve high efficiency and ideal emission characteristics. By this approach, ITOLEDs with power efficiency values of 3.8 and 30 lm W(-1) are demonstrated in fluorescent and phosphorescent types, respectively, at a luminance value of 1000 cd m(-2) with little distortion in spectral/angular characteristics.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2012-01
Language
English
Article Type
Article
Keywords

CHARGE INJECTION; DEVICES; SEMICONDUCTORS; INTERFACE; ELECTRODE; OXIDE

Citation

IEEE TRANSACTIONS ON ELECTRON DEVICES, v.59, no.1, pp.159 - 166

ISSN
0018-9383
DOI
10.1109/TED.2011.2171488
URI
http://hdl.handle.net/10203/93839
Appears in Collection
EE-Journal Papers(저널논문)
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