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dc.contributor.authorSun, Liangfeng
dc.contributor.authorChoi, Joshua J.
dc.contributor.authorStachnik, David
dc.contributor.authorBartnik, Adam C.
dc.contributor.authorHyun, Byung-Ryool
dc.contributor.authorMalliaras, George G.
dc.contributor.authorHanrath, Tobias
dc.contributor.authorWise, Frank W.
dc.date.accessioned2016-02-25T12:44:37Z
dc.date.available2016-02-25T12:44:37Z
dc.date.issued2012-05-06
dc.identifier.citationSun L, Choi JJ, Stachnik D, Bartnik AC, Hyun B-R, et al. (2012) Bright infrared quantum-dot light-emitting diodes through inter-dot spacing control. Nature Nanotechnology 7: 369–373. Available: http://dx.doi.org/10.1038/NNANO.2012.63.
dc.identifier.issn1748-3387
dc.identifier.issn1748-3395
dc.identifier.pmid22562037
dc.identifier.doi10.1038/NNANO.2012.63
dc.identifier.urihttp://hdl.handle.net/10754/597697
dc.description.abstractInfrared light-emitting diodes are currently fabricated from direct-gap semiconductors using epitaxy, which makes them expensive and difficult to integrate with other materials. Light-emitting diodes based on colloidal semiconductor quantum dots, on the other hand, can be solution-processed at low cost, and can be directly integrated with silicon. However, so far, exciton dissociation and recombination have not been well controlled in these devices, and this has limited their performance. Here, by tuning the distance between adjacent PbS quantum dots, we fabricate thin-film quantum-dot light-emitting diodes that operate at infrared wavelengths with radiances (6.4 W sr '1 m '2) eight times higher and external quantum efficiencies (2.0%) two times higher than the highest values previously reported. The distance between adjacent dots is tuned over a range of 1.3 nm by varying the lengths of the linker molecules from three to eight CH 2 groups, which allows us to achieve the optimum balance between charge injection and radiative exciton recombination. The electroluminescent powers of the best devices are comparable to those produced by commercial InGaAsP light-emitting diodes. By varying the size of the quantum dots, we can tune the emission wavelengths between 800 and 1,850 nm.© 2012 Macmillan Publishers Limited.
dc.description.sponsorshipThis material is based on work supported by the National Science Foundation (NSF, grant no. EEC-0646547) and by the New York State Foundation for Science, Technology and Innovation (NYSTAR). J.J.C. and D. S. acknowledge support from the Cornell Center for Materials Research with funding from IGERT: a Graduate Traineeship in Nanoscale Control of Surfaces and Interfaces (DGE-0654193) of the NSF. This publication is based on work supported in part by an award (no. KUS-C1-018-02) made by King Abdullah University of Science and Technology (KAUST). GISAXS measurements were conducted at Cornell High Energy Synchrotron Source (CHESS) and the authors thank D.-M. Smilgies for calibration of the beam line set-up.
dc.publisherSpringer Nature
dc.titleBright infrared quantum-dot light-emitting diodes through inter-dot spacing control
dc.typeArticle
dc.identifier.journalNature Nanotechnology
dc.contributor.institutionCornell University, Ithaca, United States
kaust.grant.numberKUS-C1-018-02


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