Lambertian White Top-Emitting Organic Light Emitting Device with Carbon Nanotube Cathode

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Lambertian White Top-Emitting Organic Light Emitting Device with Carbon Nanotube Cathode

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Title: Lambertian White Top-Emitting Organic Light Emitting Device with Carbon Nanotube Cathode
Author(s):
Freitag, P.;
Zakhidov, Al A.;
Luessem, B.;
Zakhidov, Anvar A. (UT Dallas);
Leo, K.
Sponsors: School of Natural Sciences and Mathematics. Alan G. MacDiarmid NanoTech Institute.
Format: Text
Item Type: Article
Keywords: Cathodoluminescence
Anodes
Diodes
Abstract: We demonstrate that white organic light emitting devices (OLEDs) with top carbon nanotube (CNT) electrodes show almost no microcavity effect and exhibit essentially Lambertian emission. CNT top electrodes were applied by direct lamination of multiwall CNT sheets onto white small molecule OLED stack. The devices show an external quantum efficiency of 1.5% and high color rendering index of 70. Due to elimination of the cavity effect, the devices show good color stability for different viewing angles. Thus, CNT electrodes are a viable alternative to thin semitransparent metallic films, where the strong cavity effect causes spectral shift and non-Lambertian angular dependence. Our method of the device fabrication is simple yet effective and compatible with virtually any small molecule organic semiconductor stack. It is also compatible with flexible substrates and roll-to-roll fabrication.
ISSN: 0021-8979
Persistent Link: http://hdl.handle.net/10735.1/3179

http://dx.doi.org/10.1063/1.4767439
Terms of Use: © 2012 American Institute of Physics

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