Abstract

We report an all solution-based processing method to produce efficient hybrid polymerā€“nanocrystal multilayered heterostructures for electroluminescence in the near-infrared (1050ā€“1600nm). We employ for the first time the benzenedithiol cross-linking method to produce high-quality PbS nanocrystalline films acting both as an electron-transporting and electroluminescent layer within a near-infrared light emitting diode (LED) architecture. Due to the large volume of nanocrystals and the good carrier-transport properties within the cross-linked nanocrystalline films, this device architecture yields high emission powers and good quantum efficiencies. In contrast, using ethanedithiol cross-linking molecules results in nanocrystalline films with low photo- and electro-luminescence efficiencies.

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