Polarizer-free, high-contrast inverted top-emitting organic light emitting diodes: effect of the electrode structure

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Circular polarizer (CP)-free, high-contrast inverted top-emitting organic light-emitting diodes (ITOLEDs) are demonstrated by using a semitransparent Ag electrode capped with a single dielectric layer as a top anode and Cs2CO3 (1.5 nm)/Al (1.5 nm)/Cr (100nm) as a partially absorbing bottom cathode. Low luminous reflectance is achieved by combining the broadband absorption of Cr, the weak but inherent cavity structure, and the optimal thickness of the capping layer yielding a high transmittance of a top electrode. With the optimized organic capping layer, contrast-enhanced ITOLEDs exhibit a luminous reflectance as low as 3.6% with a large thickness margin. Their luminous efficiency is shown to be comparable to or even higher than that of CP-based conventional OLEDs. (C) 2012 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2012-01
Language
English
Article Type
Article
Keywords

HIGH-EFFICIENCY; DEVICES; CATHODE

Citation

OPTICS EXPRESS, v.20, no.2, pp.1816 - 1824

ISSN
1094-4087
URI
http://hdl.handle.net/10203/97343
Appears in Collection
EE-Journal Papers(저널논문)
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