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Title: Solution-processed highly bright and durable cesium lead halide perovskite light-emitting diodes
Authors: Wei, Zhanhua
Perumal, Ajay
Su, Rui
Sushant, Shendre
Xing, Jun
Zhang, Qing
Tan, Swee Tiam
Demir, Hilmi Volkan
Xiong, Qihua
Keywords: Science::Physics
Issue Date: 2016
Source: Wei, 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/C6NR05330K
Journal: Nanoscale
Abstract: Recently, 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.
ISSN: 2040-3364
DOI: 10.1039/C6NR05330K
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Organisations: Centre of Excellence for Semiconductor Lighting and Displays
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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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