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Morphology-Dependent One- and Two-Photon Absorption Properties in Blue Emitting CsPbBr3Nanocrystals

Alvarez, Sol Laura Gutierrez ; Riel, Christina Basse ; Madani, Mahtab ; Abdellah, Mohamed LU ; Zhao, Qian ; Zou, Xianshao LU ; Pullerits, Tönu LU and Zheng, Kaibo LU (2022) In Journal of Physical Chemistry Letters 13(22). p.4897-4904
Abstract

The linear and nonlinear optical parameters and morphologic dependence of CsPbBr3 nanocrystals (NCs) are crucial for device engineering. In particular, such information in asymmetric nanocrystals is still insufficient. We characterized the OPLA (σ1) and TPA cross sections (σ2) of a series CsPbBr3 nanocrystals with various aspect ratios (AR) using femtosecond transient absorption spectroscopy (TAS). The σ1 presents a linear volume dependence of all the samples, which agrees with the previous behavior in CsPbBr3 QDs. However, the σ2 values do not exhibit conventional power dependency of the crystal volume but are also modulated by the shape-dependent local field factors. In addition, the local field effect in CsPbBr3 NCs is contributed by... (More)

The linear and nonlinear optical parameters and morphologic dependence of CsPbBr3 nanocrystals (NCs) are crucial for device engineering. In particular, such information in asymmetric nanocrystals is still insufficient. We characterized the OPLA (σ1) and TPA cross sections (σ2) of a series CsPbBr3 nanocrystals with various aspect ratios (AR) using femtosecond transient absorption spectroscopy (TAS). The σ1 presents a linear volume dependence of all the samples, which agrees with the previous behavior in CsPbBr3 QDs. However, the σ2 values do not exhibit conventional power dependency of the crystal volume but are also modulated by the shape-dependent local field factors. In addition, the local field effect in CsPbBr3 NCs is contributed by their asymmetric morphologies and polar ionic lattices, which is more pronounced than in conventional semiconductor NCs. Finally, we revealed that the lifetimes of photogenerated multiexcitonic species of those nanocrystals feature identical morphology independence in both OPLA and TPA.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
13
issue
22
pages
8 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85131730479
  • pmid:35622447
ISSN
1948-7185
DOI
10.1021/acs.jpclett.2c00710
language
English
LU publication?
yes
id
b653f2e6-682f-440f-bbca-d739c80f02b7
date added to LUP
2022-09-23 14:35:05
date last changed
2024-04-30 20:35:40
@article{b653f2e6-682f-440f-bbca-d739c80f02b7,
  abstract     = {{<p>The linear and nonlinear optical parameters and morphologic dependence of CsPbBr3 nanocrystals (NCs) are crucial for device engineering. In particular, such information in asymmetric nanocrystals is still insufficient. We characterized the OPLA (σ1) and TPA cross sections (σ2) of a series CsPbBr3 nanocrystals with various aspect ratios (AR) using femtosecond transient absorption spectroscopy (TAS). The σ1 presents a linear volume dependence of all the samples, which agrees with the previous behavior in CsPbBr3 QDs. However, the σ2 values do not exhibit conventional power dependency of the crystal volume but are also modulated by the shape-dependent local field factors. In addition, the local field effect in CsPbBr3 NCs is contributed by their asymmetric morphologies and polar ionic lattices, which is more pronounced than in conventional semiconductor NCs. Finally, we revealed that the lifetimes of photogenerated multiexcitonic species of those nanocrystals feature identical morphology independence in both OPLA and TPA. </p>}},
  author       = {{Alvarez, Sol Laura Gutierrez and Riel, Christina Basse and Madani, Mahtab and Abdellah, Mohamed and Zhao, Qian and Zou, Xianshao and Pullerits, Tönu and Zheng, Kaibo}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  number       = {{22}},
  pages        = {{4897--4904}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry Letters}},
  title        = {{Morphology-Dependent One- and Two-Photon Absorption Properties in Blue Emitting CsPbBr<sub>3</sub>Nanocrystals}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.2c00710}},
  doi          = {{10.1021/acs.jpclett.2c00710}},
  volume       = {{13}},
  year         = {{2022}},
}