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

Wang, Qi; Wang, Xiaoming; Yang, Zhi; Zhou, Ninghao; Deng, Yehao; Zhao, Jingjing; Xiao, Xun; Rudd, Peter; Moran, Andrew; Yan, Yanfa; Huang, Jinsong

doi:10.1038/s41467-019-13580-w

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

Journal Article · Tue Dec 10 00:00:00 EST 2019 · Nature Communications

DOI:https://doi.org/10.1038/s41467-019-13580-w· OSTI ID:1624224

Wang, Qi ^[1]; Wang, Xiaoming ^[2];

^[3]; Zhou, Ninghao ^[4];

^[5]; Zhao, Jingjing ^[1];

^[5]; Rudd, Peter ^[5]; Moran, Andrew ^[6];

^[7];

^[5]

Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Applied Physical Sciences
Univ. of Toledo, OH (United States). Dept. of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization
Xi’an Jiaotong University, Xi’an (China). Electronic Materials Research Laboratory, Key Laboratory of Education Ministry, International Center for Dielectric Research
Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry
Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Applied Physical Sciences
Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry
Univ. of Toledo, OH (United States). Dept. of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization

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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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Hybrid Organic-Inorganic Semiconductors for Energy (CHOISE)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1624224

Journal Information:: Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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