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

Advanced Science
Chenghao BiAndrey L Rogach

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.

References

Sep 15, 1996·Physical Review. B, Condensed Matter·C R KaganM G Bawendi
Jul 28, 2015·Journal of the American Chemical Society·Quinten A AkkermanLiberato Manna
Dec 17, 2015·Journal of the American Chemical Society·Yehonadav BekensteinA Paul Alivisatos
Oct 8, 2016·ACS Applied Materials & Interfaces·Zhiqin LiangXurong Xu
Mar 7, 2017·Journal of the American Chemical Society·Ward van der StamCelso de Mello Donega
Mar 21, 2017·Journal of the American Chemical Society·Robert GodinJames R Durrant
Jun 14, 2017·The Journal of Physical Chemistry Letters·Hiba DiabDamien Garrot
Jan 13, 2018·Nature·Michael A BeckerAlexander L Efros
Feb 7, 2018·Angewandte Chemie·Xiaoyu ZhangAndrey L Rogach

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Citations

Sep 16, 2020·Nature Materials·Xiao-Ke LiuFeng Gao
Feb 11, 2020·The Journal of Physical Chemistry Letters·Xue ZhaoJiang Tang
Nov 11, 2020·The Journal of Physical Chemistry Letters·Yongqiang JiNikolai V Gaponenko
Oct 30, 2021·The Journal of Physical Chemistry Letters·Mingyuan XieJianjun Tian

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Methods Mentioned

BETA
transmission electron microscopy
infrared spectroscopy
fluorescence resonance
FRET

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