Surface-binding molecular multipods strengthen the halide perovskite lattice and boost luminescence

Dong-Hyeok Kim, Seung-Je Woo, Claudia Pereyra Huelmo, Min-Ho Park, Aaron M. Schankler, Zhenbang Dai, Jung-Min Heo, Sungjin Kim, Guy Reuveni, Sungsu Kang, Joo Sung Kim, Hyung Joong Yun, Jinwoo Park, Jungwon Park, Omer Yaffe, Andrew M. Rappe () and Tae-Woo Lee ()
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Dong-Hyeok Kim: Seoul National University
Seung-Je Woo: Seoul National University
Claudia Pereyra Huelmo: University of Pennsylvania
Min-Ho Park: Seoul National University
Aaron M. Schankler: University of Pennsylvania
Zhenbang Dai: University of Pennsylvania
Jung-Min Heo: Seoul National University
Sungjin Kim: Seoul National University
Guy Reuveni: Weizmann Institute of Science
Sungsu Kang: Seoul National University
Joo Sung Kim: Seoul National University
Hyung Joong Yun: Korea Basic Science Institute (KBSI)
Jinwoo Park: Seoul National University
Jungwon Park: Seoul National University
Omer Yaffe: Weizmann Institute of Science
Andrew M. Rappe: University of Pennsylvania
Tae-Woo Lee: Seoul National University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Reducing the size of perovskite crystals to confine excitons and passivating surface defects has fueled a significant advance in the luminescence efficiency of perovskite light-emitting diodes (LEDs). However, the persistent gap between the optical limit of electroluminescence efficiency and the photoluminescence efficiency of colloidal perovskite nanocrystals (PeNCs) suggests that defect passivation alone is not sufficient to achieve highly efficient colloidal PeNC-LEDs. Here, we present a materials approach to controlling the dynamic nature of the perovskite surface. Our experimental and theoretical studies reveal that conjugated molecular multipods (CMMs) adsorb onto the perovskite surface by multipodal hydrogen bonding and van der Waals interactions, strengthening the near-surface perovskite lattice and reducing ionic fluctuations which are related to nonradiative recombination. The CMM treatment strengthens the perovskite lattice and suppresses its dynamic disorder, resulting in a near-unity photoluminescence quantum yield of PeNC films and a high external quantum efficiency (26.1%) of PeNC-LED with pure green emission that matches the Rec.2020 color standard for next-generation vivid displays.

Date: 2024
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DOI: 10.1038/s41467-024-49751-7

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