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Issue 42, 2016
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Solution-processed highly bright and durable cesium lead halide perovskite light-emitting diodes

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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.

Graphical abstract: Solution-processed highly bright and durable cesium lead halide perovskite light-emitting diodes

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Publication details

The article was received on 05 Jul 2016, accepted on 02 Sep 2016 and first published on 02 Sep 2016


Article type: Communication
DOI: 10.1039/C6NR05330K
Citation: Nanoscale, 2016,8, 18021-18026
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    Solution-processed highly bright and durable cesium lead halide perovskite light-emitting diodes

    Z. Wei, A. Perumal, R. Su, S. Sushant, J. Xing, Q. Zhang, S. T. Tan, H. V. Demir and Q. Xiong, Nanoscale, 2016, 8, 18021
    DOI: 10.1039/C6NR05330K

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