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<p>The Individual Identification Friend/Foe (IIFF) patch is a unique system designed  to prevent shooter-on-shooter fratricide in a battlefield environment. Using a Polymer-Organic Light Emitting Diode (p-OLED) as the emitter for the IIFF system provides  many unique opportunities and challenges in system design. Both high overall brightness  in the Infrared (700-900 nm) region and fast turn-on time (e.g., the time it takes from  application of bias voltage to full intensity of the emitter) are important for the IIFF system to be successful.  In this thesis six p-OLED candidates are tested for potential use in the IIFF  device. The best candidate was determined to be a mixture of two different ink  formulations (4:1; Yellow:Red) combined with an updated cathode design. This  provided a 410% increase in brightness and faster turn-on compared to the original  Covion Yellow emitter in the Infrared.  This thesis also includes initial research on material properties of the p-OLED that  determine the key factors that went into material selection. P-OLEDs differ from  inorganic semiconductors in that the p-n junction is created after a bias voltage is applied  and the width of the p-i-n regions varies with the bias voltage applied to the material.  Two distinct transient effects during turn-on are determined, and the turn-on intensity as a  function of time is able to be modeled as an exponential rise-to-maximum function with  two exponential time constants, one on the order of 1 s and the other on the order of 10 s.
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<br>Subjects: Friendly fire (Military science); United States; Safety measures</div>
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Elmore, James M.</div>
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