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Insights into structural defect formation in individual InP/ZnSe/ZnS quantum dots under UV oxidation

Author

Listed:
  • Hayeon Baek

    (Seoul National University
    Center for Nanoparticle Research, Institute for Basic Science (IBS))

  • Sungsu Kang

    (Seoul National University
    Center for Nanoparticle Research, Institute for Basic Science (IBS))

  • Junyoung Heo

    (Samsung Display Co., Ltd.)

  • Soonmi Choi

    (Samsung Display Co., Ltd.)

  • Ran Kim

    (Samsung Display Co., Ltd.)

  • Kihyun Kim

    (Samsung Display Co., Ltd.)

  • Nari Ahn

    (Samsung Display Co., Ltd.)

  • Yeo-Geon Yoon

    (Samsung Display Co., Ltd.)

  • Taekjoon Lee

    (Samsung Display Co., Ltd.)

  • Jae Bok Chang

    (Samsung Display Co., Ltd.)

  • Kyung Sig Lee

    (Samsung Display Co., Ltd.)

  • Young-Gil Park

    (Samsung Display Co., Ltd.)

  • Jungwon Park

    (Seoul National University
    Center for Nanoparticle Research, Institute for Basic Science (IBS)
    Seoul National University
    Seoul National University)

Abstract

InP/ZnSe/ZnS quantum dots (QDs) stand as promising candidates for advancing QD-organic light-emitting diodes (QLED), but low emission efficiency due to their susceptibility to oxidation impedes applications. Structural defects play important roles in the emission efficiency degradation of QDs, but the formation mechanism of defects in oxidized QDs has been less investigated. Here, we investigated the impact of diverse structural defects formation on individual QDs and propagation during UV-facilitated oxidation using high-resolution (scanning) transmission electron microscopy. UV-facilitated oxidation of the QDs alters shell morphology by the formation of surface oxides, leaving ZnSe surfaces poorly passivated. Further oxidation leads to the formation of structural defects, such as dislocations, and induces strain at the oxide-QD interfaces, facilitating In diffusion from the QD core. These changes in the QD structures result in emission quenching. This study provides insight into the formation of structural defects through photo-oxidation, and their effects on emission properties of QDs.

Suggested Citation

  • Hayeon Baek & Sungsu Kang & Junyoung Heo & Soonmi Choi & Ran Kim & Kihyun Kim & Nari Ahn & Yeo-Geon Yoon & Taekjoon Lee & Jae Bok Chang & Kyung Sig Lee & Young-Gil Park & Jungwon Park, 2024. "Insights into structural defect formation in individual InP/ZnSe/ZnS quantum dots under UV oxidation," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45944-2
    DOI: 10.1038/s41467-024-45944-2
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    References listed on IDEAS

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    1. Christophe Galland & Yagnaseni Ghosh & Andrea Steinbrück & Jennifer A. Hollingsworth & Han Htoon & Victor I. Klimov, 2012. "Lifetime blinking in nonblinking nanocrystal quantum dots," Nature Communications, Nature, vol. 3(1), pages 1-7, January.
    2. Qiubo Zhang & Xinxing Peng & Yifan Nie & Qi Zheng & Junyi Shangguan & Chao Zhu & Karen C. Bustillo & Peter Ercius & Linwang Wang & David T. Limmer & Haimei Zheng, 2022. "Defect-mediated ripening of core-shell nanostructures," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    3. Gabriele Rainò & Nuri Yazdani & Simon C. Boehme & Manuel Kober-Czerny & Chenglian Zhu & Franziska Krieg & Marta D. Rossell & Rolf Erni & Vanessa Wood & Ivan Infante & Maksym V. Kovalenko, 2022. "Ultra-narrow room-temperature emission from single CsPbBr3 perovskite quantum dots," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    4. Christophe Galland & Yagnaseni Ghosh & Andrea Steinbrück & Milan Sykora & Jennifer A. Hollingsworth & Victor I. Klimov & Han Htoon, 2011. "Two types of luminescence blinking revealed by spectroelectrochemistry of single quantum dots," Nature, Nature, vol. 479(7372), pages 203-207, November.
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