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Amino Acid-Passivated Pure Red CsPbI3 Quantum Dot LEDs AITranslate

Dezhang Chen; Pui Kei Ko; C.H. Angus Li; Bosen Zou; Pai Geng; Liang Guo; Jonathan E. Halpert;
The Hong Kong University of Science and Technology; The Hong Kong University of Science and Technology; The Hong Kong University of Science and Technology; The Hong Kong University of Science and Technology; China|Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology); China|Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology); The Hong Kong University of Science and Technology
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Publisher: ACS
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Abstract AITranslate

Quantum-confined CsPbI3 nanocrystals (NCs) are promising materials for the next generation of pure-red displays. Small quantum dots synthesized by colloidal methods often have excess resistive ligands, which reduce the efficiency and long-term stability of the resulting light-emitting diodes (LEDs). Here we developed a facile ligand-exchange method using amino acids to reduce long chain ligands on CsPbI3 quantum dots and improve the efficiency and stability of LEDs made from these QDs. We also assessed a variety of related amino acids and noted how their structure affects the LED performance. We found that a dual-passivation effect was observed in cysteine-passivated QDs that led to the best performance. The optimized LEDs achieved an external quantum efficiency (EQE) of 18.0% and a T50 of 87 min, comparable with many of the best reported perovskite QD, pure red LEDs.

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DOI：https://doi.org/10.1021/acsenergylett.2c02243

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Citation Information:

Quantum-confined CsPbI3 nanocrystals (NCs) are promising materials for the next generation of pure-red displays. Small quantum dots synthesized by colloidal methods often have excess resistive ligands, which reduce the efficiency and long-term stability of the resulting light-emitting diodes (LEDs). Here we developed a facile ligand-exchange method using amino acids to reduce long chain ligands on CsPbI3 quantum dots and improve the efficiency and stability of LEDs made from these QDs. We also assessed a variety of related amino acids and noted how their structure affects the LED performance. We found that a dual-passivation effect was observed in cysteine-passivated QDs that led to the best performance. The optimized LEDs achieved an external quantum efficiency (EQE) of 18.0% and a T50 of 87 min, comparable with many of the best reported perovskite QD, pure red LEDs.

quote

GB/T 7714-2015 [1] Dezhang Chen, Pui Kei Ko, C.H. Angus Li, et al. ACS Energy Letters, 2023(8). DOI:10.1021/acsenergylett.2c02243.
MLA [1] Dezhang Chen, et al., ACS Energy Letters, no. 8, 2023, https://doi.org/10.1021/acsenergylett.2c02243.
APA [1] Dezhang Chen, Pui Kei Ko, C.H. Angus Li, Bosen Zou, Pai Geng, Liang Guo, & Jonathan E. Halpert. (2023). ACS Energy Letters(8). https://doi.org/10.1021/acsenergylett.2c02243
IEEE [1] Dezhang Chen, Pui Kei Ko, C.H. Angus Li, Bosen Zou, Pai Geng, Liang Guo, and Jonathan E. Halpert, ACS Energy Letters, no. 8, 2023, doi: 10.1021/acsenergylett.2c02243.