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Weihua Lin. Portrait.

Weihua Lin

Postdoctoral fellow

Weihua Lin. Portrait.

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

Author

  • Jie Meng
  • Zhenyun Lan
  • Mohamed Abdellah
  • Bin Yang
  • Susanne Mossin
  • Mingli Liang
  • Maria Naumova
  • Qi Shi
  • Sol Laura Gutierrez Alvarez
  • Yang Liu
  • Weihua Lin
  • Ivano E. Castelli
  • Sophie E. Canton
  • Tönu Pullerits
  • Kaibo Zheng
Show all

Summary, in English

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.

Department/s

  • NanoLund: Centre for Nanoscience
  • Chemical Physics

Publishing year

2020-05-07

Language

English

Pages

3705-3711

Publication/Series

The Journal of Physical Chemistry Letters

Volume

11

Issue

9

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)
  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1948-7185