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Issue 32, 2017
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Vacuum-evaporated all-inorganic cesium lead bromine perovskites for high-performance light-emitting diodes

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Abstract

All-inorganic perovskite materials, i.e. cesium lead halide (CsPbX3 (X = I, Br, Cl)), have attracted much attention in the application of photoelectronic devices, especially in solar cells and light-emitting diodes (LEDs). However, the solubility issue of CsPbX3 restricts their utilization in solution-processed devices. Herein, we demonstrated efficient all-inorganic perovskite LEDs (PeLEDs) via co-evaporation of cesium bromide (CsBr) and lead bromide (PbBr2) based on a vacuum thermal evaporation process. The molar ratio of CsBr to PbBr2, which can be adjusted via the co-evaporation ratio, is proved to be very critical to the device performance. Excess CsBr in the perovskite layer causes poor surface morphology and affects the charge transport. With an optimization of the molar ratio, the PeLEDs based on the equimolar CsBr and PbBr2 exhibit the best green electroluminescence (EL) performance with a maximum external quantum efficiency (EQE) of 1.55%. Meanwhile, the full width at half-maximum (FWHM) of the green EL spectrum is as narrow as 18.5 nm, which can offer high color purity and large color space in display applications.

Graphical abstract: Vacuum-evaporated all-inorganic cesium lead bromine perovskites for high-performance light-emitting diodes

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Publication details

The article was received on 05 Jun 2017, accepted on 17 Jul 2017 and first published on 19 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC02477K
Citation: J. Mater. Chem. C, 2017,5, 8144-8149
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    Vacuum-evaporated all-inorganic cesium lead bromine perovskites for high-performance light-emitting diodes

    Y. Hu, Q. Wang, Y. Shi, M. Li, L. Zhang, Z. Wang and L. Liao, J. Mater. Chem. C, 2017, 5, 8144
    DOI: 10.1039/C7TC02477K

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