Molecular engineering towards efficientwhite-light-emitting perovskite

Mingming Zhang, Lili Zhao, Jiahao Xie, Qian Zhang, Xiaoyu Wang, Najma Yaqoob, Zhengmao Yin, Payam Kaghazchi, San Zhang, Hua Li, Chunfeng Zhang, Lei Wang, Lijun Zhang (), Weigao Xu () and Jun Xing ()
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Mingming Zhang: Qingdao University of Science & Technology
Lili Zhao: Nanjing University
Jiahao Xie: Jilin University
Qian Zhang: Qingdao University of Science & Technology
Xiaoyu Wang: Jilin University
Najma Yaqoob: Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), Wilhelm-Johnen-Straße
Zhengmao Yin: Qingdao University of Science & Technology
Payam Kaghazchi: Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), Wilhelm-Johnen-Straße
San Zhang: Nanjing University
Hua Li: Nanjing University
Chunfeng Zhang: Nanjing University
Lei Wang: Qingdao University of Science & Technology
Lijun Zhang: Jilin University
Weigao Xu: Nanjing University
Jun Xing: Qingdao University of Science & Technology

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Low-dimensional hybrid perovskites have demonstrated excellent performance as white-light emitters. The broadband white emission originates from self-trapped excitons (STEs). Since the mechanism of STEs formation in perovskites is still not clear, preparing new low-dimensional white perovskites relies mostly on screening lots of intercalated organic molecules rather than rational design. Here, we report an atom-substituting strategy to trigger STEs formation in layered perovskites. Halogen-substituted phenyl molecules are applied to synthesize perovskite crystals. The halogen-substituents will withdraw electrons from the branched chain (-R-NH3+) of the phenyl molecule. This will result in positive charge accumulation on -R-NH3+, and thus stronger Coulomb force of bond (-R-NH3+)-(PbBr42−), which facilitates excitons self-trapping. Our designed white perovskites exhibit photoluminescence quantum yield of 32%, color-rendering index of near 90 and chromaticity coordinates close to standard white-light. Our joint experiment-theory study provides insights into the STEs formation in perovskites and will benefit tailoring white perovskites with boosting performance.

Date: 2021
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DOI: 10.1038/s41467-021-25132-2

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