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Anisotropic nanocrystal superlattices overcoming intrinsic light outcoupling efficiency limit in perovskite quantum dot light-emitting diodes

Author

Listed:
  • Sudhir Kumar

    (Institute for Chemical and Bioengineering, ETH Zürich)

  • Tommaso Marcato

    (Institute for Chemical and Bioengineering, ETH Zürich)

  • Frank Krumeich

    (Laboratory of Inorganic Chemistry, ETH Zürich)

  • Yen-Ting Li

    (National Taiwan University of Science and Technology
    National Synchrotron Radiation Research Center)

  • Yu-Cheng Chiu

    (National Taiwan University of Science and Technology)

  • Chih-Jen Shih

    (Institute for Chemical and Bioengineering, ETH Zürich)

Abstract

Quantum dot (QD) light-emitting diodes (LEDs) are emerging as one of the most promising candidates for next-generation displays. However, their intrinsic light outcoupling efficiency remains considerably lower than the organic counterpart, because it is not yet possible to control the transition-dipole-moment (TDM) orientation in QD solids at device level. Here, using the colloidal lead halide perovskite anisotropic nanocrystals (ANCs) as a model system, we report a directed self-assembly approach to form the anisotropic nanocrystal superlattices (ANSLs). Emission polarization in individual ANCs rescales the radiation from horizontal and vertical transition dipoles, effectively resulting in preferentially horizontal TDM orientation. Based on the emissive thin films comprised of ANSLs, we demonstrate an enhanced ratio of horizontal dipole up to 0.75, enhancing the theoretical light outcoupling efficiency of greater than 30%. Our optimized single-junction QD LEDs showed peak external quantum efficiency of up to 24.96%, comparable to state-of-the-art organic LEDs.

Suggested Citation

  • Sudhir Kumar & Tommaso Marcato & Frank Krumeich & Yen-Ting Li & Yu-Cheng Chiu & Chih-Jen Shih, 2022. "Anisotropic nanocrystal superlattices overcoming intrinsic light outcoupling efficiency limit in perovskite quantum dot light-emitting diodes," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29812-5
    DOI: 10.1038/s41467-022-29812-5
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