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

Qi Wang, Xiaoming Wang, Zhi Yang, Ninghao Zhou, Yehao Deng, Jingjing Zhao, Xun Xiao, Peter Rudd, Andrew Moran, Yanfa Yan and Jinsong Huang ()
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Qi Wang: University of North Carolina at Chapel Hill
Xiaoming Wang: The University of Toledo
Zhi Yang: International Center for Dielectric Research, Xi’an Jiaotong University
Ninghao Zhou: University of North Carolina at Chapel Hill
Yehao Deng: University of North Carolina at Chapel Hill
Jingjing Zhao: University of North Carolina at Chapel Hill
Xun Xiao: University of North Carolina at Chapel Hill
Peter Rudd: University of North Carolina at Chapel Hill
Andrew Moran: University of North Carolina at Chapel Hill
Yanfa Yan: The University of Toledo
Jinsong Huang: University of North Carolina at Chapel Hill

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-13580-w

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