Improved quantum efficiency for electroluminescence in semiconducting polymers

Article Abstract:

Conjugated polymers with luminescence properties have potential uses in light-emitting diodes, where performance is linked by the maximum quantum efficiency attainable for electroluminescence. The theoretical upper limit is just 25% of the corresponding quantum efficiency for photoluminescence if the lowest-energy excited states ae strongly bound excitons. A value of 50% is reported for the ratio in polymer light-emitting diodes, reached by combining electron transport materials with the conjugated polymer.

Polymers, Observations, Electroluminescence, Semiconductors

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Highly mobile electrons and holes on isolated chains of the semiconducting polymer poly(phenylene vinylene)

Article Abstract:

Conducting polymers are of interest because they can be used as semiconductors in field-effect transistors. The pulse-radiolysis time-resolved microwave conductivity technique is used with a dilute solution of a derivative of the semiconducting polymer poly(phenylene vinylene) (PPV) in order to find out the intra-chain mobilities of electrons on isolated polymer chains. The values which were calculated are larger than have been measured before for PPV-based materials.

Research and Testing Services, Scientific Research and Development Services, Research & Development-Universities, Materials research, Conducting polymers, University research

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High-mobility ultrathin semiconducting films prepared by spin coating

Article Abstract:

Techniques for spin coating ultrathin (~50 armstrong), crystalline and continuous metal chalcogenide films, based on the low temperature decomposition of highly soluble hydrazinium precursors is demonstrated. The spin-coating technique is expected to be applicable to a range of metal chalcogenides, particularly those based on main group metals, as well as for the fabrication of a variety of thin-film based devices.

Paint and Coating Manufacturing, Paints and allied products, Electrodeposition Coatings, Materials, Semiconductor films, Electrocoatings

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