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Improving light harvesting in polymer photodetector devices through nanoindented metal mask films J. Appl. Phys.External quantum efficiency versus charge carriers mobility in polythiophene/methanofullerene based planar photodetectors

A highly efficient blue polymer light-emitting diode based exclusively on commercial poly͑9,9-dioctylfluorene͒ and poly͓͑9,9-dioctylfluorenyl-2,7-diyl͒-co-͑4,4Ј-͑N-͑4-s-butylphenyl͒͒ diphenylamine͔͒ is demonstrated. High electroluminescent efficiency is achieved by enhancing electron currents and making devices in multilayered structures. CsF/ Al is used as the efficient electron injection cathode, and the fabrication process is in the glove box to enhance electron mobility by reducing oxygen adsorption. The multilayer structure is prepared by the liquid buffer layer technique. The maximum efficiency is 2.5 cd/ A at deep blue with the corresponding external quantum efficiency of 2%.

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