Modulating Charge-Carrier Dynamics in Mn-Doped All-Inorganic Halide Perovskite Quantum Dots through the Doping-Induced Deep Trap States

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Transition-metal ion doping has been demonstrated to be effective for tuning the photoluminescence properties of perovskite quantum dots (QDs). However, it would inevitably introduce defects in the lattice. As the Mn concentration increases, the Mn dopant photoluminescence quantum yield (PLQY) first increases and then decreases. Herein the influence of the dopant and the defect states on the photophysics in Mn-doped CsPbCl3 QDs was studied by time-resolved spectroscopies, whereas the energy levels of the possible defect states were analyzed by density functional theory calculations. We reveal the formation of deep interstitials defects (Cli) by Mn2+ doping. The depopulation of initial QD exciton states is a competition between exciton-dopant energy transfer and defect trapping on an early time scale (<100 ps), which determines the final PLQY of the QDs. The present work establishes a robust material optimization guideline for all of the emerging applications where a high PLQY is essential.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Technical University of Denmark
  • Dalian Institute of Chemical Physics Chinese Academy of Sciences
  • German Electron Synchrotron (DESY)
  • Southwest Petroleum University
  • ELI-HU Non-profit Ltd
  • South Valley University
  • Lund University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Den kondenserade materiens fysik
  • Atom- och molekylfysik och optik
Originalspråkengelska
Sidor (från-till)3705-3711
Antal sidor7
TidskriftThe Journal of Physical Chemistry Letters
Volym11
Utgåva nummer9
StatusPublished - 2020 maj 7
PublikationskategoriForskning
Peer review utfördJa