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Few-layer formamidinium lead bromide nanoplatelets for ultrapure-green and high-efficiency light-emitting diodes

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Abstract

Formamidinium lead bromide perovskite (FAPbBr3) nanocrystals have attracted increasing attention due to their greener photoluminescence (PL) and higher thermal stability in comparison to more popular methylammonium lead bromide perovskite (MAPbBr3). Here we proposed a facile and highly reproducible room-temperature method for the preparation of few-layer (1–4) two-dimensional (2D) FAPbBr3 nanoplatelets (NPs) with ultrapure green PL at 532 nm and high photoluminescence quantum yield (PLQY) of 88%. High-efficiency ultrapure green light-emitting diodes (LEDs) based on the few-layer 2D FAPbBr3 NPs were further demonstrated. The LEDs showed a maximum current efficiency (CE) of 15.31 cd/A and an external quantum efficiency (EQE) of 3.53%, which are significantly better than the FAPbBr3 polycrystalline film-based LEDs reported so far. Significantly, the 2D FAPbBr3 NPs-based LEDs exhibited an ultrapure-green color emission that could cover 97% of the Recommendation 2020 (Rec. 2020) color standard and 114% of the national television system committee (NTSC) standard in the CIE 1931 color space. Moreover, the devices possessed a much better stability than the MAPbBr3 nanocrystals-based LEDs in air; the half lifetime T50 of our devices was about 5 times longer than that of MAPbBr3 nanocrystals-based LEDs. This work demonstrates the great potential of FAPbBr3 NPs in light-emitting devices for future ultrahigh-resolution displays.

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Acknowledgements

This work was supported by the National Basic Research Program of China (No. 2016YFA0202400), the National Natural Science Foundation of China (Nos. 51672180, 51622306, and 21673151), Collaborative Innovation Center of Suzhou Nano Science & Technology, Qing Lan Project, 111 project, and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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  1. Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China

    Huan Fang, Wei Deng, Xiujuan Zhang, Xiuzhen Xu, Meng Zhang, Jiansheng Jie & Xiaohong Zhang

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  1. Huan Fang
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  2. Wei Deng
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  3. Xiujuan Zhang
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Correspondence to Xiujuan Zhang or Xiaohong Zhang.

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Fang, H., Deng, W., Zhang, X. et al. Few-layer formamidinium lead bromide nanoplatelets for ultrapure-green and high-efficiency light-emitting diodes. Nano Res. 12, 171–176 (2019). https://doi.org/10.1007/s12274-018-2197-3

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