Synchronously Polishing the Lead-Rich Surface and Passivating Surface Defects of CsPb(Br/I)3 Quantum Dots for High-Performance Pure-Red PeLEDs

Xin Zhou; Mengmeng Yang; Chao Shen; Linyuan Lian; Lintao Hou; Jibin Zhang

doi:10.1021/acs.nanolett.4c00220

Synchronously Polishing the Lead-Rich Surface and Passivating Surface Defects of CsPb(Br/I)₃ Quantum Dots for High-Performance Pure-Red PeLEDs

Nano Lett. 2024 Mar 27;24(12):3719-3726. doi: 10.1021/acs.nanolett.4c00220. Epub 2024 Mar 14.

Authors

Xin Zhou^{1

2}, Mengmeng Yang³, Chao Shen⁴, Linyuan Lian⁵, Lintao Hou⁴, Jibin Zhang⁵

Affiliations

¹ National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510641, China.
² Guangdong Provincial Key Laboratory of Semiconductor Micro Display, Foshan Nationstar Optoelectronics Company Ltd., Foshan 528000, China.
³ Guangdong Provincial Key Laboratory of Chip and Integration Technology, School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, China.
⁴ Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Siyuan Laboratory, Department of Physics, Jinan University, Guangzhou 510632, China.
⁵ Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China.

PMID: 38484387
DOI: 10.1021/acs.nanolett.4c00220

Abstract

Mixed-halide CsPb(Br/I)₃ perovskite quantum dots (QDs) are regarded as one of the most promising candidates for pure-red perovskite light-emitting diodes (PeLEDs) due to their precise spectral tuning property. However, the lead-rich surface of these QDs usually results in halide ion migration and nonradiative recombination loss, which remains a great challenge for high-performance PeLEDs. To solve the above issues, we employ a chelating agent of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid hydrate (DOTA) to polish the lead-rich surface of the QDs and meanwhile introduce a new ligand of 2,3-dimercaptosuccinic acid (DMSA) to passivate surface defects of the QDs. This synchronous post-treatment strategy results in high-quality CsPb(Br/I)₃ QDs with suppressed halide ion migration and an improved photoluminescence quantum yield, which enables us to fabricate spectrally stable pure-red PeLEDs with a peak external quantum efficiency of 23.2%, representing one of the best performance pure-red PeLEDs based on mixed-halide CsPb(Br/I)₃ QDs reported to date.

Keywords: light-emitting diodes; mixed halide; perovskite quantum dots; pure-red emission; surface defects.