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Demonstration of (doped) polymer LED structures for emission and amplification in the visible: High brightness LEDs and high modulation speed LEDs (500 MHz)

Technion has developed a small pixel LED structure that enables a match with the equivalent electrical circuit of the polymer LED to that of a commercial voltage driver). Using the state of the art materials provided by Merck, Technion has constructed efficient LEDs with low turn on voltage and which are bright at 3V. These LEDs were driven by a 50MHz pulse train and produced -12ns pulse width with - 5ns rise and fall time. These results indicate that our 100MHz milestone was achieved. The next generation of polymers that are now being studied show a much higher mobility (orders of magnitude) compared to the original “state of the art” materials and hence should achieve a modulation frequency of at least 500MHz. Technion have also started to characterize polymer doped LEDs. High PL efficiency and long emission lifetime have already been verified.

To facilitate LED design, Technion have developed a new theoretical approach for the analysis of contact phenomena in low mobility disordered materials (i.e. organic) within a device model framework.

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