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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

4 Scopus Citations
View graph of relations

Author(s)

  • Chenghao Bi
  • Stephen V. Kershaw
  • Kaibo Zheng
  • Tönu Pullerits
  • Sergey Gaponenko
  • Jianjun Tian

Detail(s)

Original languageEnglish
Article number1900462
Journal / PublicationAdvanced Science
Volume6
Issue number13
Online published8 May 2019
Publication statusPublished - 3 Jul 2019

Link(s)

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 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.

Research Area(s)

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

Citation Format(s)

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; Pullerits, Tönu; Gaponenko, Sergey; Tian, Jianjun; Rogach, Andrey L.

In: Advanced Science, Vol. 6, No. 13, 1900462, 03.07.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

Download Statistics

No data available