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Research Article

Chiral CdSe/CdS quantum dot (in rod)-light-emitting diodes with circularly polarized electroluminescence

Tianwei Duan1Jing Ai2Sujie Chen3Gufeng He3Xiaojun Guo3()Lu Han2()Shunai Che1,2Yingying Duan2()
School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, Shanghai 200240, China
School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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Graphical Abstract

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The chiral quantum dot (in rod)-light-emitting diodes were fabricated through spin-coating evaporation of chiral CdSe/CdS quantum rods as an emitting layer, exhibiting right-handed circularly polarized light emission at 600 nm due to the filtration effects as a result of the circular Bragg resonance by quasi-photonic crystal structures.

Abstract

Chiral quantum dot (in rod)-light-emitting diodes (CQLEDs) with circularly polarized electroluminescence (CPEL) have driven interest in the future display, communication, and storage industries. However, the preparation of CQLEDs is still a challenging unresolved. Herein, we fabricated CQLEDs through spin-coating evaporation of chiral CdSe/CdS quantum rods (CCCQs) colloidal solution on indium tin oxide substrate. The CCCQs were synthesized via an isotropically epitaxial growth with cholic acid as the symmetry breaking agent, which induced one-direction chiral dislocation around the c axis of their hexagonal crystal structure. The CCCQs were ranked side-by-side in right-handed chiral arrangement with helical axis perpendicular to substrate due to chiral driving force of the cholic acid arrangement. The CQLEDs exhibited a negative CPEL signal at 600 nm with a |gEL| of 2 × 10−4, which is ascribable to the selective filtration on emission arising from the circular Bragg resonance by quasi-photonic crystal structures.

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Nano Research
Pages 9573-9577
Cite this article:
Duan T, Ai J, Chen S, et al. Chiral CdSe/CdS quantum dot (in rod)-light-emitting diodes with circularly polarized electroluminescence. Nano Research, 2022, 15(10): 9573-9577. https://doi.org/10.1007/s12274-022-4536-7
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