In-Situ Surface Repair of FAPbBr3 Quantum Dots toward High-Performance Pure-Green Perovskite Light-Emitting Diodes

Jibin Zhang; Dandan Zhang; Xin Zhou; Linyuan Lian; Chao Shen; Chenhui Su; Shuyan Fang; Xiangfei Liang; Fanglong Yuan; Lintao Hou; Ying-Xue Yuan

doi:10.1021/acs.nanolett.4c03229

In-Situ Surface Repair of FAPbBr₃ Quantum Dots toward High-Performance Pure-Green Perovskite Light-Emitting Diodes

Nano Lett. 2024 Oct 2;24(39):12196-12203. doi: 10.1021/acs.nanolett.4c03229. Epub 2024 Sep 20.

Authors

Affiliations

¹ Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University, Zhengzhou 450001, China.
² Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, College of Physics and Optical Engineering, Jinan University, Guangzhou 510632, China.
³ Guangdong Provincial Key Laboratory of Semiconductor Micro Display, Foshan Nationstar Optoelectronics Company Ltd., Foshan 528000, China.
⁴ Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China.
⁵ Henan Key Laboratory of Crystalline Molecular Functional Materials, Tianjian Laboratory of Advanced Biomedical Sciences, Institute of Advanced Biomedical Sciences, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.

PMID: 39303013
DOI: 10.1021/acs.nanolett.4c03229

Abstract

Metal halide perovskite light-emitting diodes (PeLEDs) are ideal for high-resolution displays due to their tunable emission, narrow spectra, and low-cost processing. Colloidal FAPbBr₃ perovskite quantum dots (PeQDs) enhance radiative recombination, making them efficient for pure-green PeLEDs. However, their low stability and surface defects limit their practical application. Here, we address these challenges by proposing an in situ surface repair strategy using benzhydroxamic acid (BHA) as a modifier. We demonstrated that BHA can coordinate with Pb²⁺ ions and form hydrogen bonds with FA⁺ and halide ions, effectively reducing nonradiative recombination and maintaining the integrity of the PeQDs. High-quality FAPbBr₃ PeQDs with a photoluminescence quantum yield (PLQY) of up to 92.5% were achieved, leading to pure-green PeLEDs with an external quantum efficiency (EQE) of 24.8% and a maximum luminance of 40,231 cd m^-2, providing a feasible and promising perspective for advanced solid-state lighting and displays.

Keywords: FAPbBr3; light-emitting diodes; perovskite quantum dots; stability; surface repair.