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<p>Localized surface plasmon resonance (LSPR) is widely studied for its role in enhancing optical properties and facilitating charge or energy transfer through exciton-plasmon interactions in materials such as organic dyes, chalcogenide and halide perovskite quantum dots (PQDs), and transition-metal dichalcogenides (TMDCs). LSPR coupling with perovskite nanocrystals (PNCs) and quantum dots (QDs) has gained significant attention due to their outstanding electronic and optical properties. However, the precise effects of LSPR on the exciton dynamics of PQDs remain largely unexplored. This study focuses on exciton-plasmon coupling between gold nanorods (Au NRs) and individual methylammonium lead iodide (MAPbI₃) PQDs using single-particle blinking analysis. While PQDs without Au display a slow ON-OFF (long-lived ON and OFF states) blinking behavior, those on Au NRs exhibit short-lived, high-intensity ON states. This difference in blinking dynamics is attributed to energy transfer from Au NRs to PQDs through exciton-plasmon interactions and chemical interface damping. Further investigation through single-particle time-resolved photoluminescence measurements and ensemble-level transient absorption spectroscopy reveals that plasmon coupling enhances radiative recombination while expediting the ground-state bleach-recovery <i>via</i> energy transfer. Additionally, spatial variations in QD distributions on AU NRs are examined using transmission electron microscopy, high-resolution scanning transmission electron microscopy, and finite-difference time-domain simulations, providing deeper insight into the nature of exciton-plasmon interactions.</p>

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Photoluminescence enhancement by exciton-plasmon coupling in MAPbI3 quantum dots on gold nanorods

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月28日

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  • Tianci Wang,
  • Tetsuro Katayama,
  • Xu Shi,
  • Akihiro Furube,
  • Takuya Okamoto,
  • Vasudevanpillai Biju

摘要

Localized surface plasmon resonance (LSPR) is widely studied for its role in enhancing optical properties and facilitating charge or energy transfer through exciton-plasmon interactions in materials such as organic dyes, chalcogenide and halide perovskite quantum dots (PQDs), and transition-metal dichalcogenides (TMDCs). LSPR coupling with perovskite nanocrystals (PNCs) and quantum dots (QDs) has gained significant attention due to their outstanding electronic and optical properties. However, the precise effects of LSPR on the exciton dynamics of PQDs remain largely unexplored. This study focuses on exciton-plasmon coupling between gold nanorods (Au NRs) and individual methylammonium lead iodide (MAPbI₃) PQDs using single-particle blinking analysis. While PQDs without Au display a slow ON-OFF (long-lived ON and OFF states) blinking behavior, those on Au NRs exhibit short-lived, high-intensity ON states. This difference in blinking dynamics is attributed to energy transfer from Au NRs to PQDs through exciton-plasmon interactions and chemical interface damping. Further investigation through single-particle time-resolved photoluminescence measurements and ensemble-level transient absorption spectroscopy reveals that plasmon coupling enhances radiative recombination while expediting the ground-state bleach-recovery via energy transfer. Additionally, spatial variations in QD distributions on AU NRs are examined using transmission electron microscopy, high-resolution scanning transmission electron microscopy, and finite-difference time-domain simulations, providing deeper insight into the nature of exciton-plasmon interactions.