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Localized Bound Multiexcitons in Engineered Quasi-2D Perovskites Grains at Room Temperature for Efficient Lasers

Li, Guohui LU ; Lin, Kai ; Zhao, Kefan ; Huang, Yang ; Ji, Ting ; Shi, Linlin ; Hao, Yuying ; Xiong, Qihua ; Zheng, Kaibo LU and Pullerits, Tonu LU , et al. (2023) In Advanced Materials 35(20).
Abstract

Reducing the excitation threshold to minimize the Joule heating is critical for the realization of perovskite laser diodes. Although bound excitons are promising for low threshold laser, how to generate them at room temperature for laser applications is still unclear in quasi-2D perovskite-based devices. In this work, via engineering quasi-2D perovskite PEA2(CH3NH3)n-1PbnBr3n+1 microscopic grains by the anti-solvent method, room-temperature multiexciton radiative recombination is successfully demonstrated at a remarkably low pump density of 0.97 µJ cm−2, which is only one-fourth of that required in 2D CdSe nanosheets. In... (More)

Reducing the excitation threshold to minimize the Joule heating is critical for the realization of perovskite laser diodes. Although bound excitons are promising for low threshold laser, how to generate them at room temperature for laser applications is still unclear in quasi-2D perovskite-based devices. In this work, via engineering quasi-2D perovskite PEA2(CH3NH3)n-1PbnBr3n+1 microscopic grains by the anti-solvent method, room-temperature multiexciton radiative recombination is successfully demonstrated at a remarkably low pump density of 0.97 µJ cm−2, which is only one-fourth of that required in 2D CdSe nanosheets. In addition, the well-defined translational momentum in quasi-2D perovskite grains can restrict the Auger recombination which is detrimental to radiative emission. Furthermore, the quasi-2D perovskite grains are favorable for increasing binding energies of excitons and biexcitons and so as the related radiative recombination. Consequently, the prepared <n = 8> phase quasi-2D perovskite film renders a threshold of room-temperature stimulated emission as low as 13.7 µJ cm−2, reduced by 58.6% relative to the amorphous counterpart with larger grains. The findings in this work are expected to facilitate the development of solution-processable perovskite multiexcitonic laser diodes.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
laser, low threshold, multiexciton, quasi-2D perovskite
in
Advanced Materials
volume
35
issue
20
article number
2211591
publisher
John Wiley & Sons Inc.
external identifiers
  • pmid:36918401
  • scopus:85151993689
ISSN
0935-9648
DOI
10.1002/adma.202211591
language
English
LU publication?
yes
id
efd57da0-28e5-4f16-9578-844f91127e8e
date added to LUP
2023-07-19 11:40:48
date last changed
2024-04-19 23:40:31
@article{efd57da0-28e5-4f16-9578-844f91127e8e,
  abstract     = {{<p>Reducing the excitation threshold to minimize the Joule heating is critical for the realization of perovskite laser diodes. Although bound excitons are promising for low threshold laser, how to generate them at room temperature for laser applications is still unclear in quasi-2D perovskite-based devices. In this work, via engineering quasi-2D perovskite PEA<sub>2</sub>(CH<sub>3</sub>NH<sub>3</sub>)<sub>n</sub><sub>-1</sub>Pb<sub>n</sub>Br<sub>3</sub><sub>n</sub><sub>+1</sub> microscopic grains by the anti-solvent method, room-temperature multiexciton radiative recombination is successfully demonstrated at a remarkably low pump density of 0.97 µJ cm<sup>−2</sup>, which is only one-fourth of that required in 2D CdSe nanosheets. In addition, the well-defined translational momentum in quasi-2D perovskite grains can restrict the Auger recombination which is detrimental to radiative emission. Furthermore, the quasi-2D perovskite grains are favorable for increasing binding energies of excitons and biexcitons and so as the related radiative recombination. Consequently, the prepared &lt;n = 8&gt; phase quasi-2D perovskite film renders a threshold of room-temperature stimulated emission as low as 13.7 µJ cm<sup>−2</sup>, reduced by 58.6% relative to the amorphous counterpart with larger grains. The findings in this work are expected to facilitate the development of solution-processable perovskite multiexcitonic laser diodes.</p>}},
  author       = {{Li, Guohui and Lin, Kai and Zhao, Kefan and Huang, Yang and Ji, Ting and Shi, Linlin and Hao, Yuying and Xiong, Qihua and Zheng, Kaibo and Pullerits, Tonu and Cui, Yanxia}},
  issn         = {{0935-9648}},
  keywords     = {{laser; low threshold; multiexciton; quasi-2D perovskite}},
  language     = {{eng}},
  number       = {{20}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Advanced Materials}},
  title        = {{Localized Bound Multiexcitons in Engineered Quasi-2D Perovskites Grains at Room Temperature for Efficient Lasers}},
  url          = {{http://dx.doi.org/10.1002/adma.202211591}},
  doi          = {{10.1002/adma.202211591}},
  volume       = {{35}},
  year         = {{2023}},
}