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Bright Light via Molecular Control Joel D. Brock, Cornell University, DMR 0936384

Bright Light via Molecular Control Joel D. Brock, Cornell University, DMR 0936384.

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Bright Light via Molecular Control Joel D. Brock, Cornell University, DMR 0936384

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  1. Bright Light via Molecular ControlJoel D. Brock, Cornell University, DMR 0936384 Intellectual Merit: A paper by researchers at Cornell in Nature Nanotechnology reports a record-breaking colloidal quantum dot (QD) infrared LED with brightness that is an order of magnitude higher than in the best infrared QD-device reported previously, and is comparable to the performance of existing infrared light emitters grown by planar epitaxial techniques. This record was enabled by the controlled and dramatic variation of the dissociation and recombination of excitons in QDs. Variable-length molecular linkers afforded the fine-tuning of inter-QD spacing which was measured by grazing-incidence small-angle X-ray scattering (GISAXS) at the D1 line at CHESS. Remarkably, the results show that the efficiency of a QD thin-film LED can be improved by two orders of magnitude, while the spacing between adjacent QDs is adjusted by only a few angstroms. Schematic device structure of the QD-LED device. Electrons (holes) are injected from the ZnO/Al (PEDOT:PSS/ITO) contact. Liangfeng Sun, Joshua J. Choi, David Stachnik, Adam C. Bartnik, Byung-Ryool Hyun, George G. Malliaras, Tobias Hanrath, and Frank W. Wise; "Bright Infrared Quantum-dot Light-emitting Diodes Through Inter-dot Spacing Control", Nature Nanotechnology (Online - DOI: 10.1038/NNANO.2012.63). CHESS DMR-0936384 2012_1

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