Characterization of Transparent Organic Light-Emitting Device (TOLED)

Report No. ARL-TR-4322
Authors: David Y.T. Chiu, Steven M. Blomquist, Eric Forsythe, Jianmin Shi, and David Morton
Date/Pages: November 2007; 34 pages
Abstract: Typical OLEDs are constructed in a bottom-emitting configuration where active organic layers are deposited on top of a transparent electrode, such as indium-tin-oxide (ITO), and then a non-transparent low function metal cathode, such as Mg, Ca, Li, is deposited as the top electrode. When appropriate current and voltage are applied to the electrodes, the organic layers are activated, and light is produced which can be seen at the transparent ITO side. Recently there has been increasing interest in the fabrication of OLEDs that are capable of emitting light from the top surface or from both the top and bottom surfaces by using transparent electrodes on both sides. These transparent OLEDs (TOLEDs) offer some unique features that are applicable to both the military and the commercial world. Examples of which include helmet-mounted see-through head-up displays, windshield or window displays, stacked organic light-emitting devices (SOLED) for improved resolution and enhanced full-color capability, etc. This report describes a study performed on TOLEDs by using Mg:Ag and ZnS/Ag/ZnS as the transparent cathodes, a standard OLED device structure, and transparent ITO anode on a glass substrate to investigate and characterize the device performance as function of the transparent layer thickness; specifically at Mg:Ag layer thickness of 75 ¿, 150 ¿, 100 ¿, and 200 ¿.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 2007