Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs

Zong-Shuo Liu; Ye Wang; Feng Zhao; Hua-Hui Li; Wei-Zhi Liu; Wan-Shan Shen; Hong-Wei Duan; Ya-Kun Wang; Liang-Sheng Liao

doi:10.1038/s41377-024-01704-x

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Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs

Original Articles

- Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs
- Light: Science & Applications Vol. 14, Issue 1, Pages: 271-279(2025)
- Affiliations：
  
  1.Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, China
  2.Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Macau SAR, Taipa, China
- Author bio：
  
  Ya-Kun Wang (wangyakun@suda.edu.cn)
  Liang-Sheng Liao (lsliao@suda.edu.cn)
- Funds：
- DOI：10.1038/s41377-024-01704-x
  CLC：
- Published：31 January 2025，
  
  Published Online：07 January 2025，
  
  Received：25 July 2024，
  
  Revised：23 November 2024，
  
  Accepted：2024-11-27
- Accepted：
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Liu, Z. S. et al. Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs. Light: Science & Applications, 14, 271-279 (2025).
DOI：

Liu, Z. S. et al. Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs. Light: Science & Applications, 14, 271-279 (2025). DOI： 10.1038/s41377-024-01704-x.

摘要

Abstract

Perovskite quantum dots (PQDs) show promise in light-emitting diodes (LEDs). However

near-infrared (NIR) LEDs employing PQDs exhibit inferior external quantum efficiency related to the PQD emitting in the visible range. One fundamental issue arises from the PQDs dynamic surface: the ligand loss and ions migration to the interfacial sites serve as quenching centers

resulting in trap-assisted recombination and carrier loss. In this work

we developed a chemical treatment strategy to eliminate the interface quenching sites and achieve high carrier utilization. We employ a bidentate and liquid agent (Formamidine thiocyanate

FASCN) with tight binding to suppress the ligand loss and the formation of interfacial quenching sites: the FASCN-treated films exhibit fourfold higher binding energy than the original oleate ligands. Furthermore

the short ligands (carbon chain <3) enable the treated films to show eightfold higher conductivity; and the liquid characteristics of FASCN avoid the use of high polar solvents and guarantee better passivation. The high conductivity ensures efficient charge transportation

enabling PQD-based NIR-LEDs to have a record-low voltage of 1.6 V at 776 nm. Furthermore

the champion EQE of the treated LEDs is ~23%: this is twofold higher than the control

and represents the highest among reported PQD-based NIR-LEDs.

关键词

Keywords

references

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