Tailored large-particle quantum dots with high color purity and excellent electroluminescent efficiency

Bo-Chen Liu; Qizhong Lin; Shuang-Qiao Sun; Qi Sun; Xing Peng; Xinyuan Chen; Yang Li; Yue-Min Xie; Shuit-Tong Lee; Man-Keung Fung

doi:10.1016/j.scib.2025.01.017

Tailored large-particle quantum dots with high color purity and excellent electroluminescent efficiency

Sci Bull (Beijing). 2025 Jan 10:S2095-9273(25)00041-6. doi: 10.1016/j.scib.2025.01.017. Online ahead of print.

Authors

Bo-Chen Liu¹, Qizhong Lin², Shuang-Qiao Sun³, Qi Sun³, Xing Peng³, Xinyuan Chen², Yang Li⁴, Yue-Min Xie⁵, Shuit-Tong Lee⁶, Man-Keung Fung⁷

Affiliations

¹ Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China; Institute of Organic Optoelectronics (IOO), Jiangsu Industrial Technology Research Institute (JITRI), Suzhou 215200, China.
² Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China.
³ Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China.
⁴ Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China; Poly Optoelectronics Tech. Ltd., Jiangmen 529020, China.
⁵ Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China; Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou 215123, China; Institute of Organic Optoelectronics (IOO), Jiangsu Industrial Technology Research Institute (JITRI), Suzhou 215200, China. Electronic address: [email protected].
⁶ Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China; Macao Institute of Materials Science and Engineering (MIMSE), MUST-SUDA Joint Research Center for Advanced Functional Materials, Zhuhai MUST Science and Technology Research Institute, Macau University of Science and Technology, Macao 999078, China. Electronic address: [email protected].
⁷ Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China; Macao Institute of Materials Science and Engineering (MIMSE), MUST-SUDA Joint Research Center for Advanced Functional Materials, Zhuhai MUST Science and Technology Research Institute, Macau University of Science and Technology, Macao 999078, China; Institute of Organic Optoelectronics (IOO), Jiangsu Industrial Technology Research Institute (JITRI), Suzhou 215200, China. Electronic address: [email protected].

PMID: 39863488
DOI: 10.1016/j.scib.2025.01.017

Abstract

High-quality quantum dots (QDs) possess superior electroluminescent efficiencies and ultra-narrow emission linewidths are essential for realizing ultra-high definition QD light-emitting diodes (QLEDs). However, the synthesis of such QDs remains challenging. In this study, we present a facile high-temperature successive ion layer adsorption and reaction (HT-SILAR) strategy for the growth of precisely tailored Zn_1-_xCd_xSe/ZnSe shells, and the consequent production of high-quality, large-particle, alloyed red CdZnSe/Zn_1-_xCd_xSe/ZnSe/ZnS/CdZnS QDs. The transitional Zn_1-_xCd_xSe/ZnSe shells serve to effectively suppress heavy hole energy level splitting and weaken the exciton-longitudinal optical phonon coupling of QDs, thus facilitating the formation of highly luminescent QDs with a near-unity photoluminescence quantum yield of 97.8% and narrow emission with a full width at half maximum of 17.1 nm. In addition, the introduction of transitional shells can extend the particle size of QDs to 19.0 nm, which is beneficial for efficient carrier recombination and reduced Joule heating in QD-based LEDs. As a result, the fabricated QLEDs can achieve a record external quantum efficiency of 38.2%, luminance over 120,000 cd m^-2, and exceptional operational stability T₉₅ (tested at 1,000 cd m^-2) of 24,100 h. These findings provide new avenues for synthesizing high-quality QDs with high color purity.

Keywords: High color purity; High efficiency; Large particles; Light-emitting diodes; Quantum dots.