Graphical 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.
Zhang, Y. J.; Oka, T.; Suzuki, R.; Ye, J. T.; Iwasa, Y. Electrically switchable chiral light-emitting transistor. Science 2014, 344, 725–728.
Heffern, M. C.; Matosziuk, L. M.; Meade, T. J. Lanthanide probes for bioresponsive imaging. Chem. Rev. 2014, 114, 4496–4539.
Berezovsky, J.; Mikkelsen, M. H.; Gywat, O.; Stoltz, N. G.; Coldren, L. A.; Awschalom, D. D. Nondestructive optical measurements of a single electron spin in a quantum dot. Science 2006, 314, 1916–1920.
Albano, G.; Pescitelli, G.; Di Bari, L. Chiroptical properties in thin films of π-conjugated systems. Chem. Rev. 2020, 120, 10145–10243.
Chen, W. J.; Ma, K.; Duan, P. F.; Ouyang, G. H.; Zhu, X. F.; Zhang, L.; Liu, M. H. Circularly polarized luminescence of nanoassemblies via multi-dimensional chiral architecture control. Nanoscale 2020, 12, 19497–19515.
Liu, C. C.; Yang, J. C.; Lam, J. W. Y.; Feng, H. T.; Tang, B. Z. Chiral assembly of organic luminogens with aggregation-induced emission. Chem. Sci. 2022, 13, 611–632.
Han, J. M.; Guo, S.; Lu, H.; Liu, S. J.; Zhao, Q.; Huang, W. Recent progress on circularly polarized luminescent materials for organic optoelectronic devices. Adv. Opt. Mate. 2018, 6, 1800538.
Zhang, D. W.; Li, M.; Chen, C. F. Recent advances in circularly polarized electroluminescence based on organic light-emitting diodes. Chem. Soc. Rev. 2020, 49, 1331–1343.
Kim, Y. H.; Zhai, Y. X.; Lu, H. P.; Pan, X.; Xiao, C. X.; Gaulding, E. A.; Harvey, S. P.; Berry, J. J.; Vardeny, Z. V.; Luther, J. M. et al. Chiral-induced spin selectivity enables a room-temperature spin light-emitting diode. Science 2021, 371, 1129–1133.
Peeters, E.; Christiaans, M. P. T.; Janssen, R. A. J.; Schoo, H. F. M.; Dekkers, H. P. J. M.; Meijer, E. W. Circularly polarized electroluminescence from a polymer light-emitting diode. J. Am. Chem. Soc. 1997, 119, 9909–9910.
Li, M.; Wang, Y. F.; Zhang, D. D.; Duan, L.; Chen, C. F. Axially chiral TADF-active enantiomers designed for efficient blue circularly polarized electroluminescence. Angew. Chem., Int. Ed. 2020, 59, 3500–3504.
Xu, Y. C.; Wang, Q. Y.; Cai, X. L.; Li, C. L.; Wang, Y. Highly efficient electroluminescence from narrowband green circularly polarized multiple resonance thermally activated delayed fluorescence enantiomers. Adv. Mater. 2021, 33, 2100652.
Zhang, Y. P.; Liang, X.; Luo, X. F.; Song, S. Q.; Li, S.; Wang, Y.; Mao, Z. P.; Xu, W. Y.; Zheng, Y. X.; Zuo, J. L. et al. Chiral spiro-axis induced blue thermally activated delayed fluorescence material for efficient circularly polarized oleds with low efficiency roll-off. Angew. Chem., Int. Ed. 2021, 60, 8435–8440.
Qian, G. W.; Yang, X. F.; Wang, X. B.; Herod, J. D.; Bruce, D. W.; Wang, S. Y.; Zhu, W. G.; Duan, P. F.; Wang, Y. F. Chiral platinum-based metallomesogens with highly efficient circularly polarized electroluminescence in solution-processed organic light-emitting diodes. Adv. Opt. Mater. 2020, 8, 2000775.
Lu, G. Z.; Wu, Z. G.; Wu, R. X.; Cao, X. S.; Zhou, L.; Zheng, Y. X.; Yang, C. L. Semitransparent circularly polarized phosphorescent organic light-emitting diodes with external quantum efficiency over 30% and dissymmetry factor close to 10−2. Adv. Funct. Mater. 2021, 31, 2102898.
Hong, J.; Kim, S.; Park, G.; Lee, Y.; Kim, H.; Kim, S.; Lee, T. W.; Kim, C.; You, Y. Chiral polymer hosts for circularly polarized electroluminescence devices. Chem. Sci. 2021, 12, 8668–8681.
Wan, L.; Shi, X. Y.; Wade, J.; Campbell, A. J.; Fuchter, M. J. Strongly circularly polarized crystalline and β-phase emission from poly(9, 9-dioctylfluorene)-based deep-blue light-emitting diodes. Adv. Opt. Mater. 2021, 9, 2100066.
Duan, T. W.; Ai, J.; Cui, X. Y.; Feng, X. W.; Duan, Y. Y.; Han, L.; Jiang, J. G.; Che, S. N. Spontaneous chiral self-assembly of CdSe@CdS nanorods. Chem 2021, 7, 2695–2707.
Duan, T. W.; Ai, J.; Duan, Y. Y.; Han, L.; Che, S. N. Self-assembly of chiral nematic-like films with chiral nanorods directed by chiral molecules. Chem. Mater. 2021, 33, 6227–6232.
Bisoyi, H. K.; Li, Q. Light-directed dynamic chirality inversion in functional self-organized helical superstructures. Angew. Chem., Int. Ed. 2016, 55, 2994–3010.
Zhang, Y. B.; Zhang, F. J.; Wang, H. Z.; Wang, L.; Wang, F. F.; Lin, Q. L.; Shen, H. B.; Li, L. S. High-efficiency CdSe/CdS nanorod-based red light-emitting diodes. Opt. Express 2019, 27, 7935–7944.