The emergence of inorganic–organic hybrid perovskites, a unique class of solution-processable crystalline semiconductors, provides new opportunities for large-area, low-cost and colour-saturated light-emitting diodes (LEDs) ideal for display and solid-state lighting applications1. However, the performance of blue perovskite LEDs (PeLEDs)2,3,4,5,6,7,8,9,10,11 is far inferior to that of their near-infrared, red and green counterparts12,13,14,15,16,17,18,19, strongly limiting the practicality of the PeLED technology. Here, we demonstrate blue PeLEDs emitting at 483 nm with colour coordinates of (0.094, 0.184) and operating with a peak external quantum efficiency of up to 9.5% at a luminance of 54 cd m–2. The devices have a T50 lifetime of 250 s for an initial brightness of 100 cd m–2. The efficient blue electroluminescence originates from a structure of quantum-confined perovskite nanoparticles embedded within quasi-two-dimensional phases with higher bandgaps, prepared by an antisolvent processing scheme. Our work paves the way towards high-performance PeLEDs in the blue region.
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The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.
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This work was financially supported by the National Key R&D Program of China (2016YFB0401600), the National Natural Science Foundation of China (51522209, 91833303, 51911530155, 91733302), the Fundamental Research Funds for the Central Universities (2017XZZX001-03A). D.D. and R.H.F acknowledge the Engineering and Physical Sciences Research Council (EPSRC) and Zhejiang University Education Foundation Global Partnership Fund for support. This research used resources of the Advanced Photon Source, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under contract no. DE-AC02-06CH11357.
The authors declare no competing interests.
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Liu, Y., Cui, J., Du, K. et al. Efficient blue light-emitting diodes based on quantum-confined bromide perovskite nanostructures. Nat. Photonics 13, 760–764 (2019). https://doi.org/10.1038/s41566-019-0505-4
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