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<p>Light Emitting Polymers (LEPs) are being developed for lightweight, low cost, infrared emitters for potential Individual IFF applications. The unique requirements for emitter operation (modulated, short term response) require study of time dependent optical and electrical behavior. Multiple LEP devices were evaluated to determine intensity variations and voltage response as a function of time and activations. From experimental data, it became possible to suggest approaches for creating the optimum LEP device for future IIFF devices. Key results included the increase of intensity in all emitters, observation of necessary \"warm-up\" periods for yellow devices, large voltage responses of red emitters, and device \"reset\" time. All emitters saw intensity increase while being activated continuously over short periods of time. The yellow emitter had the largest intensity variation, so a \"warm-up\" period of constant current was used, significantly impacting the intensity. The red devices were determined to have large turn-on voltages at initial activation. The device \"reset\" time, or the time for the intensity to drop after reaching optimum intensity was also determined. Further research into the combination of red and yellow dyes is suggested, as well as continued research into the impact that small periods of operating time have on LEP intensity.
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<br>Subjects: Electromotive force; Infrared radiation; Polymers</div>
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Schumacher, Johannah G.</div>
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