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Photoluminescence Polarization of MAPbBr3 Perovskite Nanostructures. Can the Dielectric Contrast Effect Explain It?

Shi, Juanzi LU ; Ryabov, Igor ; Seth, Sudipta LU ; Frantsuzov, Pavel A. ; Rafie-Zinedine, Safi LU ; Walther, Andreas LU ; Messing, Maria E. LU ; Wu, Xiangang ; Lu, Wengao and Zhong, Haizheng , et al. (2022) In ACS Photonics 9(12). p.3888-3898
Abstract

The dielectric contrast effect is usually evoked to explain anisotropy of optical properties of elongated nanoobjects, for example, semiconductor nanowires. We applied two-dimensional polarization imaging microscopy to measure the polarization of photoluminescence (PL) excitation and PL intensity of nanoaggregates of in-situ formed MAPbBr3perovskite nanoparticles in a stretched polymeric matrix. Scanning electron microscopy images of these objects were also acquired to characterize their sizes and shapes. We find that individual perovskite aggregates with sizes of 100-300 nm often possess a PL excitation polarization degree as high as 0.5-0.9, which is up to three times higher than the polarization degree of absorption... (More)

The dielectric contrast effect is usually evoked to explain anisotropy of optical properties of elongated nanoobjects, for example, semiconductor nanowires. We applied two-dimensional polarization imaging microscopy to measure the polarization of photoluminescence (PL) excitation and PL intensity of nanoaggregates of in-situ formed MAPbBr3perovskite nanoparticles in a stretched polymeric matrix. Scanning electron microscopy images of these objects were also acquired to characterize their sizes and shapes. We find that individual perovskite aggregates with sizes of 100-300 nm often possess a PL excitation polarization degree as high as 0.5-0.9, which is up to three times higher than the polarization degree of absorption predicted by the dielectric contrast effect. Small aggregates of nanoparticles possess an emission polarization degree substantially higher than that of excitation. Computer simulations of many possible scenarios show that the dielectric contrast alone cannot quantitatively explain the polarization properties of the studied objects. We propose energy transfer to localized emitting sites and the dependence of PL yield on excitation power density as possible factors strongly influencing the polarization properties of PL emission and PL excitation, respectively.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dielectric contrast, energy transfer, excitation power dependence, perovskite aggregates, polarized luminescence, two-dimensional polarization imaging microscopy
in
ACS Photonics
volume
9
issue
12
pages
11 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85142628760
ISSN
2330-4022
DOI
10.1021/acsphotonics.2c01150
language
English
LU publication?
yes
id
db43bd28-18d8-4153-a749-0b43263d729a
date added to LUP
2023-01-25 10:52:29
date last changed
2023-11-21 05:59:18
@article{db43bd28-18d8-4153-a749-0b43263d729a,
  abstract     = {{<p>The dielectric contrast effect is usually evoked to explain anisotropy of optical properties of elongated nanoobjects, for example, semiconductor nanowires. We applied two-dimensional polarization imaging microscopy to measure the polarization of photoluminescence (PL) excitation and PL intensity of nanoaggregates of in-situ formed MAPbBr<sub>3</sub>perovskite nanoparticles in a stretched polymeric matrix. Scanning electron microscopy images of these objects were also acquired to characterize their sizes and shapes. We find that individual perovskite aggregates with sizes of 100-300 nm often possess a PL excitation polarization degree as high as 0.5-0.9, which is up to three times higher than the polarization degree of absorption predicted by the dielectric contrast effect. Small aggregates of nanoparticles possess an emission polarization degree substantially higher than that of excitation. Computer simulations of many possible scenarios show that the dielectric contrast alone cannot quantitatively explain the polarization properties of the studied objects. We propose energy transfer to localized emitting sites and the dependence of PL yield on excitation power density as possible factors strongly influencing the polarization properties of PL emission and PL excitation, respectively.</p>}},
  author       = {{Shi, Juanzi and Ryabov, Igor and Seth, Sudipta and Frantsuzov, Pavel A. and Rafie-Zinedine, Safi and Walther, Andreas and Messing, Maria E. and Wu, Xiangang and Lu, Wengao and Zhong, Haizheng and Scheblykin, Ivan G.}},
  issn         = {{2330-4022}},
  keywords     = {{dielectric contrast; energy transfer; excitation power dependence; perovskite aggregates; polarized luminescence; two-dimensional polarization imaging microscopy}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{12}},
  pages        = {{3888--3898}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Photonics}},
  title        = {{Photoluminescence Polarization of MAPbBr<sub>3 </sub>Perovskite Nanostructures. Can the Dielectric Contrast Effect Explain It?}},
  url          = {{http://dx.doi.org/10.1021/acsphotonics.2c01150}},
  doi          = {{10.1021/acsphotonics.2c01150}},
  volume       = {{9}},
  year         = {{2022}},
}