Enhancing crystal integrity and structural rigidity of CsPbBr<sub>3</sub> nanoplatelets to achieve a narrow color-saturated blue emission

Qianqian Huang; Wenxu Yin; Bo Gao; Qingsen Zeng; Dong Yao; Hao Zhang; Yinghe Zhao; Weijia Zheng; Jiaqi Zhang; Xuyong Yang; Xiaoyu Zhang; Andrey L. Rogach

doi:10.1038/s41377-024-01441-1

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Enhancing crystal integrity and structural rigidity of CsPbBr₃ nanoplatelets to achieve a narrow color-saturated blue emission

Article

- Enhancing crystal integrity and structural rigidity of CsPbBr₃ nanoplatelets to achieve a narrow color-saturated blue emission
- Light: Science & Applications Vol. 13, Issue 5, Pages: 985-997(2024)
- Affiliations：
- Author bio：
  
  halex610@foxmail.com
  mzhangxiaoyu@jlu.edu.cn
  nandrey.rogach@cityu.edu.hk
- Funds：
- DOI：10.1038/s41377-024-01441-1
  CLC：
- Received：13 December 2023，
  
  Revised：2024-03-27，
  
  Accepted：29 March 2024，
  
  Published Online：11 May 2024，
  
  Published：2024-12
- Accepted：
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Qianqian Huang, Wenxu Yin, Bo Gao, et al. Enhancing crystal integrity and structural rigidity of CsPbBr₃ nanoplatelets to achieve a narrow color-saturated blue emission[J]. Light: Science & Applications, 2024, 13(5): 985-997.
DOI：

Qianqian Huang, Wenxu Yin, Bo Gao, et al. Enhancing crystal integrity and structural rigidity of CsPbBr₃ nanoplatelets to achieve a narrow color-saturated blue emission[J]. Light: Science & Applications, 2024, 13(5): 985-997. DOI： 10.1038/s41377-024-01441-1.

摘要

Abstract

Quantum-confined CsPbBr

perovskites are promising blue emitters for ultra-high-definition displays

but their soft lattice caused by highly ionic nature has a limited stability. Here

we endow CsPbBr

nanoplatelets (NPLs) with atomic crystal-like structural rigidity through proper surface engineering

by using strongly bound N-dodecylbenzene sulfonic acid (DBSA). A stable

rigid crystal structure

as well as uniform

orderly-arranged surface of these NPLs is achieved by optimizing intermediate reaction stage

by switching from molecular clusters to mono-octahedra

while interaction with DBSA resulted in formation of a Cs

O monolayer shell capping the NPL surface. As a result

both structural and optical stability of the CsPbBr

NPLs is enhanced by strong covalent bonding of DBSA

which inhibits undesired phase transitions and decomposition of the perovskite phase potentially caused by ligand desorption. Moreover

rather small amount of DBSA ligands at the NPL surface results in a short inter-NPL spacing in their closely-packed films

which facilitates efficient charge injection and transport. Blue photoluminescence of the produced CsPbBr

NPLs is bright (nearly unity emission quantum yield) and peaks at 457 nm with an extremely narrow bandwidth of 3.7 nm at 80 K

while the bandwidth of the electroluminescence (peaked at 460 nm) also reaches a record-narrow value of 15 nm at room temperature. This value corresponds to the CIE coordinates of (0.141

0.062)

which meets Rec. 2020 standards for ultra-high-definition displays.

The chemical equilibrium is optimized using N-dodecylbenzene sulfonic acid for enhancing the crystal integrity and structural rigidity of CsPbBr

perovskite nanoplatelets

resulting in the

ir spectrally stable

bright and extremely narrow color-saturated blue emission.

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Keywords

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Enhancing crystal integrity and structural rigidity of CsPbBr3 nanoplatelets to achieve a narrow color-saturated blue emission

DOI：10.1038/s41377-024-01441-1

摘要

Abstract

关键词

Keywords

references

Enhancing crystal integrity and structural rigidity of CsPbBr₃ nanoplatelets to achieve a narrow color-saturated blue emission