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Nat Commun. 2019 Dec 10;10(1):5633. doi: 10.1038/s41467-019-13580-w.

Efficient sky-blue perovskite light-emitting diodes via photoluminescence enhancement.

Author information

1
Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599, USA.
2
Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization, The University of Toledo, Toledo, Ohio, 43606, USA.
3
Electronic Materials Research Laboratory, Key Laboratory of Education Ministry, International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, 710049, China.
4
Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599, USA.
5
Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599, USA. jhuang@unc.edu.

Abstract

The efficiencies of green and red perovskite light-emitting diodes (PeLEDs) have been increased close to their theoretical upper limit, while the efficiency of blue PeLEDs is lagging far behind. Here we report enhancing the efficiency of sky-blue PeLEDs by overcoming a major hurdle of low photoluminescence quantum efficiency in wide-bandgap perovskites. Blending phenylethylammonium chloride into cesium lead halide perovskites yields a mixture of two-dimensional and three-dimensional perovskites, which enhances photoluminescence quantum efficiency from 1.1% to 19.8%. Adding yttrium (III) chloride into the mixture further enhances photoluminescence quantum efficiency to 49.7%. Yttrium is found to incorporate into the three-dimensional perovskite grain, while it is still rich at grain boundaries and surfaces. The yttrium on grain surface increases the bandgap of grain shell, which confines the charge carriers inside grains for efficient radiative recombination. Record efficiencies of 11.0% and 4.8% were obtained in sky-blue and blue PeLEDs, respectively.

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