The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Ivan Scheblykin. Portrait.

Ivan Scheblykin

Professor

Ivan Scheblykin. Portrait.

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

Author

  • Juanzi Shi
  • Igor Ryabov
  • Sudipta Seth
  • Pavel A. Frantsuzov
  • Safi Rafie-Zinedine
  • Andreas Walther
  • Maria E. Messing
  • Xiangang Wu
  • Wengao Lu
  • Haizheng Zhong
  • Ivan G. Scheblykin
Show all

Summary, in English

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.

Department/s

  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • Chemical Physics
  • NanoLund: Centre for Nanoscience
  • LTH Profile Area: Photon Science and Technology
  • Atomic Physics
  • LTH Profile Area: Engineering Health
  • LTH Profile Area: Aerosols
  • Solid State Physics

Publishing year

2022-12-21

Language

English

Pages

3888-3898

Publication/Series

ACS Photonics

Volume

9

Issue

12

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • dielectric contrast
  • energy transfer
  • excitation power dependence
  • perovskite aggregates
  • polarized luminescence
  • two-dimensional polarization imaging microscopy

Status

Published

ISBN/ISSN/Other

  • ISSN: 2330-4022