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

Meng, Jie ; Lan, Zhenyun ; Abdellah, Mohamed LU ; Yang, Bin ; Mossin, Susanne ; Liang, Mingli ; Naumova, Maria ; Shi, Qi LU ; Gutierrez Alvarez, Sol Laura and Liu, Yang , et al. (2020) In The Journal of Physical Chemistry Letters 11(9). p.3705-3711
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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Letters
volume
11
issue
9
pages
7 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:32329350
  • scopus:85084379895
ISSN
1948-7185
DOI
10.1021/acs.jpclett.0c01050
language
English
LU publication?
yes
id
cdbc6a5d-afd4-4a26-90b6-8abc51686471
date added to LUP
2020-06-10 10:16:07
date last changed
2020-10-27 02:54:51
@article{cdbc6a5d-afd4-4a26-90b6-8abc51686471,
  abstract     = {<p>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 (&lt;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.</p>},
  author       = {Meng, Jie and Lan, Zhenyun and Abdellah, Mohamed and Yang, Bin and Mossin, Susanne and Liang, Mingli and Naumova, Maria and Shi, Qi and Gutierrez Alvarez, Sol Laura and Liu, Yang and Lin, Weihua and Castelli, Ivano E. and Canton, Sophie E. and Pullerits, Tönu and Zheng, Kaibo},
  issn         = {1948-7185},
  language     = {eng},
  month        = {05},
  number       = {9},
  pages        = {3705--3711},
  publisher    = {The American Chemical Society (ACS)},
  series       = {The Journal of Physical Chemistry Letters},
  title        = {Modulating Charge-Carrier Dynamics in Mn-Doped All-Inorganic Halide Perovskite Quantum Dots through the Doping-Induced Deep Trap States},
  url          = {http://dx.doi.org/10.1021/acs.jpclett.0c01050},
  doi          = {10.1021/acs.jpclett.0c01050},
  volume       = {11},
  year         = {2020},
}