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dc.contributor.authorWei, Zhanhuaen_US
dc.contributor.authorPerumal, Ajayen_US
dc.contributor.authorSu, Ruien_US
dc.contributor.authorSushant, Shendreen_US
dc.contributor.authorXing, Junen_US
dc.contributor.authorZhang, Qingen_US
dc.contributor.authorTan, Swee Tiamen_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.contributor.authorXiong, Qihuaen_US
dc.identifier.citationWei, Z., Perumal, A., Su, R., Sushant, S., Xing, J., Zhang, Q., . . . Xiong, Q. (2016). Solution-processed highly bright and durable cesium lead halide perovskite light-emitting diodes. Nanoscale, 8(42), 18021-18026. doi:10.1039/C6NR05330Ken_US
dc.description.abstractRecently, CsPbBr3 perovskites have been emerging as very promising green emission materials for light-emitting diodes (LEDs) due to their high color purity, low cost and high photoluminescence quantum yield (PLQY). However, the corresponding LED performance is still low and far behind CH3NH3PbBr3; it is due to the lack of proper perovskite film preparation methods and interfacial engineering. Herein, we report highly bright and durable CsPbBr3-based LEDs fabricated using a one-step solution method. The precursor solution is prepared by simply dissolving CsPbBr3 powder and a CsBr additive in dimethyl sulfoxide (DMSO). We find that the CsBr additive not only significantly enhances the PLQY but also induces directional crystal growth into micro-plates, forming a smooth perovskite film for LEDs. LEDs employing such high quality films show a high luminance of 7276 cd m−2 and high color purity with a full width at half maximum of 18 nm. Furthermore, the as-fabricated LEDs reveal an outstanding ambient stability with a decent luminance output (>100 cd m−2, steady increase without any degradation trend) for at least 15 h under a constant driving current density (66.7 mA cm−2). And we propose two reasons for this unique luminance increasing behavior: (1) the CsPbBr3 perovskite is thermally stable and can survive from joule heat; and (2) on the other hand, the joule heating will induce interface or crystalline film annealing, reduce device resistance and then enhance the luminance output.en_US
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.rights© 2016 The Royal Society of Chemistry. All rights reserved. This paper was published in Nanoscale and is made available with permission of The Royal Society of Chemistry.en_US
dc.titleSolution-processed highly bright and durable cesium lead halide perovskite light-emitting diodesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.organizationCentre of Excellence for Semiconductor Lighting and Displaysen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsLight-emitting Diodes (LEDs)en_US
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