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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Spontaneous Self-Assembly of Cesium Lead Halide Perovskite Nanoplatelets into Cuboid Crystals with High Intensity Blue Emission

Author

  • Chenghao Bi
  • Shixun Wang
  • Stephen V. Kershaw
  • Kaibo Zheng
  • Tönu Pullerits
  • Sergey Gaponenko
  • Jianjun Tian
  • Andrey L. Rogach

Summary, in English


Colloidal all-inorganic perovskite nanocrystals have gained significant attention as a promising material for both fundamental and applied research due to their excellent emission properties. However, reported photoluminescence quantum yields (PL QYs) of blue-emitting perovskite nanocrystals are rather low, mostly due to the fact that the high energy excitons for such wide bandgap materials are easily captured by interband traps, and then decay nonradiatively. In this work, it is demonstrated how to tackle this issue, performing self-assembly of 2D perovskite nanoplatelets into larger size (≈50 nm × 50 nm × 20 nm) cuboid crystals. In these structures, 2D nanoplatelets being isolated from each other within the cuboidal scaffold by organic ligands constitute multiple quantum wells, where exciton localization on potential disorder sites helps them to bypass nonradiative channels present in other platelets. As a result, the cuboid crystals show an extremely high PL QY of 91% of the emission band centered at 480 nm. Moreover, using the same synthetic method, mixed-anion CsPb(Br/Cl)
3
cuboid crystals with blue emission peaks ranging from 452 to 470 nm, and still high PL QYs in the range of 72–83% are produced.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience
  • eSSENCE: The e-Science Collaboration

Publishing year

2019-07-03

Language

English

Publication/Series

Advanced Science

Volume

6

Issue

13

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Condensed Matter Physics

Keywords

  • blue emission
  • cesium lead halide perovskite
  • nanoplatelets
  • quantum wells
  • self-assembly

Status

Published

ISBN/ISSN/Other

  • ISSN: 2198-3844