DataVXACS Materials LettersPaper
journal article·2024-09-02

Strongly-Confined CsPbI3 Quantum Dots by Surface Cleaning-Induced Ligand Exchange for Spectrally Stable Pure-Red Light-Emitting Diodes with Efficiency Exceeding 26%

Ke Ren, Jingcong Hu, Chenghao Bi, Shibo Wei, Xingyu Wang, Nora H. de Leeuw, Yue Lu, Manling Sui, Wenxin Wang

ACS Materials Letters· Volume 6· Issue 9
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Source abstract

Abstract

The advancement of pure-red perovskite light-emitting diodes (PeLEDs) is still a challenge because of surface “wastes” (like surface vacancies and excessive insulating ligands) on quantum dots (QDs). Herein, we develop a method to synthesize single-halide pure-red CsPbI 3 QDs, combining a strong quantum confinement effect and meticulous surface-cleaning-induced ligand exchange. We achieve pure-red emitting QDs by controlling the size and uniformity under iodide-rich conditions. Subsequently, vacancy defects and insulating ligands are cleared through introducing acid. Then this surface-cleaning process induces ligand exchange to further inhibit the nonradiative recombination and improve the electrical property of QDs. These QDs show a pure-red photoluminescence (PL) at 635 nm with the PL quantum yield (PLQY) of 99%. Finally, PeLEDs, which utilize these QDs, demonstrate a pure-red electroluminescence (EL) peak at 638 nm with a maximum external quantum efficiency (EQE) of 26.0% and an excellent half-lifetime ( T 50 ) of 490 min at an original luminance of 102 cd/m 2 .
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao 266000, P. R. China

College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, P. R. China

Beijing Key Lab of Microstructure and Property of Advanced Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China

Yantai Research Institute, Harbin Engineering University, Yantai 264000, P.R. China

School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.

Department of Earth Sciences, Utrecht University, 3584 CB Utrecht, The Netherlands

Funding

Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering · Natural Science Foundation of Heilongjiang Province · Harbin Engineering University · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Natural Science Foundation of Shandong Province · New Era Longjiang Excellent Doctoral Dissertation Project

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