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Nano Research

Article Title

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

Authors

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

Keywords

formamidinium lead bromide perovskite, few-layer nanoplatelets, high-efficiency light-emitting diodes, ultrapure-green electroluminescence

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 lightemitting 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.

Graphical Abstract

Publisher

Tsinghua University Press

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