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

Bi, Chenghao; Wang, Shixun; Kershaw, Stephen V.; Zheng, Kaibo LU ; Pullerits, Tönu LU ; Gaponenko, Sergey; Tian, Jianjun and Rogach, Andrey L. (2019) In Advanced Science
Abstract


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... (More)


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.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
blue emission, cesium lead halide perovskite, nanoplatelets, quantum wells, self-assembly
in
Advanced Science
publisher
John Wiley & Sons
external identifiers
  • scopus:85065522784
ISSN
2198-3844
DOI
10.1002/advs.201900462
language
English
LU publication?
yes
id
3ca49603-72b0-4659-932a-51ad4384038d
date added to LUP
2019-06-04 12:36:50
date last changed
2019-06-19 04:14:40
@article{3ca49603-72b0-4659-932a-51ad4384038d,
  abstract     = {<p><br>
                                                         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)                             <br>
                            <sub>3</sub><br>
                                                          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.                         <br>
                        </p>},
  author       = {Bi, Chenghao and Wang, Shixun and Kershaw, Stephen V. and Zheng, Kaibo and Pullerits, Tönu and Gaponenko, Sergey and Tian, Jianjun and Rogach, Andrey L.},
  issn         = {2198-3844},
  keyword      = {blue emission,cesium lead halide perovskite,nanoplatelets,quantum wells,self-assembly},
  language     = {eng},
  publisher    = {John Wiley & Sons},
  series       = {Advanced Science},
  title        = {Spontaneous Self-Assembly of Cesium Lead Halide Perovskite Nanoplatelets into Cuboid Crystals with High Intensity Blue Emission},
  url          = {http://dx.doi.org/10.1002/advs.201900462},
  year         = {2019},
}