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      Bright Light-Emitting Diodes Based on Organometal Halide Perovskite Nanoplatelets

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          Abstract

          Bright light-emitting diodes based on solution-processable organometal halide perovskite nanoplatelets are demonstrated. The nanoplatelets created using a facile one-pot synthesis exhibit narrow-band emissions at 529 nm and quantum yield up to 85%. Using these nanoparticles as emitters, efficient electroluminescence is achieved with a brightness of 10 590 cd m(-2) . These ligand-capped nanoplatelets appear to be quite stable in moisture, allowing out-of-glovebox device fabrication.

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          Most cited references28

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          The path to ubiquitous and low-cost organic electronic appliances on plastic.

          Organic electronics are beginning to make significant inroads into the commercial world, and if the field continues to progress at its current, rapid pace, electronics based on organic thin-film materials will soon become a mainstay of our technological existence. Already products based on active thin-film organic devices are in the market place, most notably the displays of several mobile electronic appliances. Yet the future holds even greater promise for this technology, with an entirely new generation of ultralow-cost, lightweight and even flexible electronic devices in the offing, which will perform functions traditionally accomplished using much more expensive components based on conventional semiconductor materials such as silicon.
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            Electroluminescence in conjugated polymers

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              Enhanced photoluminescence and solar cell performance via Lewis base passivation of organic-inorganic lead halide perovskites.

              Organic-inorganic metal halide perovskites have recently emerged as a top contender to be used as an absorber material in highly efficient, low-cost photovoltaic devices. Solution-processed semiconductors tend to have a high density of defect states and exhibit a large degree of electronic disorder. Perovskites appear to go against this trend, and despite relatively little knowledge of the impact of electronic defects, certified solar-to-electrical power conversion efficiencies of up to 17.9% have been achieved. Here, through treatment of the crystal surfaces with the Lewis bases thiophene and pyridine, we demonstrate significantly reduced nonradiative electron-hole recombination within the CH(3)NH(3)PbI(3-x)Cl(x) perovskite, achieving photoluminescence lifetimes which are enhanced by nearly an order of magnitude, up to 2 μs. We propose that this is due to the electronic passivation of under-coordinated Pb atoms within the crystal. Through this method of Lewis base passivation, we achieve power conversion efficiencies for solution-processed planar heterojunction solar cells enhanced from 13% for the untreated solar cells to 15.3% and 16.5% for the thiophene and pyridine-treated solar cells, respectively.
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                Author and article information

                Journal
                Advanced Materials
                Adv. Mater.
                Wiley
                09359648
                January 2016
                January 2016
                November 17 2015
                : 28
                : 2
                : 305-311
                Affiliations
                [1 ]Department of Physics; Florida State University; Tallahassee FL 32306 USA
                [2 ]Department of Chemical and Biological Engineering; FAMU-FSU College of Engineering; Tallahassee FL 32310 USA
                [3 ]Materials Science Program; Florida State University; Tallahassee FL 32306 USA
                [4 ]Department of Chemistry and Biochemistry; Florida State University; Tallahassee FL 32306 USA
                [5 ]National High Magnetic Field Laboratory; Florida State University; Tallahassee FL 32310 USA
                Article
                10.1002/adma.201503954
                26572239
                f54f8db9-ba40-4d12-bc8c-956dcf904d6a
                © 2015

                http://doi.wiley.com/10.1002/tdm_license_1.1

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