ACS_the Journal of Physical Chemistry Letters


ACS_the Journal of Physical Chemistry Letters

June 9, 2022

Volume 13, Issue 22

Pages 4840-5087

Multiple-Route Exciton Recombination Dynamics and Improved Stability of Perovskite Quantum Dots by Plasmonic Photonic Crystal

We have studied the excited-state exciton recombination dynamics of perovskite quantum dots (QDs) through time-resolved photoluminescence (PL), PL blinking, PL intensity-dependent lifetime modulation, and long-term photostability tests. The various spectroscopic characterizations elucidate that the perovskite QDs have multiple intrinsic exciton recombination routes even in a single QD, i.e., exciton, biexciton, and positive/negative trions, which are dissimilarly contributed to ON and OFF state emissions. We also find that the enhanced radiative recombination from placing green QDs on a photonic Ag nanotip array induces notably improved long-term PL stability. We consider that the accelerated radiative recombination of QDs by strong coupling with the plasmonics of the photonic Ag nanotip array, while eliminating nonradiative pathways, is proven to be a critical factor for improved long-term stability.

  • Weon-Sik Chae
  • Sinyoung Cho
  • Joo-Yun Jung
  • Jong-Hwa Kim
  • Jong-Soo Lee

The Journal of Physical Chemistry Letters | Vol 13, No 22 (

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