Enhanced stability and linearly polarized emission from CsPbI<sub>3</sub> perovskite nanoplatelets through A-site cation engineering

Woo Hyeon Jeong; Junzhi Ye; Jongbeom Kim; Rui Xu; Xinyu Shen; Chia-Yu Chang; Eilidh L. Quinn; Hyungju Ahn; Myoung Hoon Song; Peter D. Nellist; Henry J. Snaith; Yunwei Zhang; Bo Ram Lee; Robert L. Z. Hoye

doi:10.1038/s41377-025-02135-y

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Enhanced stability and linearly polarized emission from CsPbI₃ perovskite nanoplatelets through A-site cation engineering

Original Articles

- Enhanced stability and linearly polarized emission from CsPbI₃ perovskite nanoplatelets through A-site cation engineering
- Light: Science & Applications Vol. 15, Issue 2, Pages: 460-470(2026)
- Affiliations：
  
  1.School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Republic of Korea
  2.Inorganic Chemistry Laboratory, University of Oxford, Oxford, UK
  3.Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
  4.School of Physics, Sun Yat-sen University, Guangzhou, China
  5.Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK
  6.Pohang Accelerator Laboratory (PAL) Pohang, Gyeongbuk, Republic of Korea
  7.Department of Materials, University of Oxford, Oxford, UK
- Author bio：
  
  Junzhi Ye (junzhi.ye@chem.ox.ac.uk)
  Bo Ram Lee (brlee@skku.edu)
  Robert L. Z. Hoye (robert.hoye@chem.ox.ac.uk)
- Funds：
- DOI：10.1038/s41377-025-02135-y
  CLC：
- Received：12 April 2025，
  
  Revised：2025-10-23，
  
  Accepted：12 November 2025，
  
  Online First：02 January 2026，
  
  Published：28 February 2026
- Accepted：
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Jeong, W. H. et al. Enhanced stability and linearly polarized emission from CsPbI₃ perovskite nanoplatelets through A-site cation engineering. Light: Science & Applications, 15, 460-470 (2026).
DOI：

Jeong, W. H. et al. Enhanced stability and linearly polarized emission from CsPbI₃ perovskite nanoplatelets through A-site cation engineering. Light: Science & Applications, 15, 460-470 (2026). DOI： 10.1038/s41377-025-02135-y.

摘要

Abstract

The anisotropy of perovskite nanoplatelets (PeNPLs) opens up many opportunities in optoelectronics

including enabling the emission of linearly polarized light. But the limited stability of PeNPLs is a pressing challenge

especially for red-emitting CsPbI

. Herein

we address this limitation by alloying formamidinium (FA) into the perovskite cuboctahedral site. Unlike Cs/FA alloying in bulk thin films or nanocubes

FA incorporation in nanoplatelets requires meticulous control over the reaction conditions

given that nanoplatelets are obtained in kinetically-driven growth regimes instead of thermodynamically-driven conditions. Through in-situ photoluminescence (PL) measurements

we find that excess FA leads to uncontrolled growth

where phase impurities and nanoplatelets of multiple thicknesses co-exist. Restricting the FA content to up to 25% Cs substitution enables monodisperse PeNPLs

and increases the PL quantum yield (from 53% to 61%)

exciton lifetime (from 18 ns to 27 ns)

and stability in ambient air (from ~2 days to

7 days) compared to CsPbI

. This arises due to hydrogen bonding between FA and the oleate and oleylammonium ligands

anchoring them to the surface to improve optoelectronic properties and stability. The reduction in non-radiative recombination

improvement in the nanoplatelet aspect ratio

and higher ligand density lead to FA-containing PeNPLs more effectively forming edge-up superlattices

enhancing the PL degree of linear polarization from 5.1% (CsPbI

) to 9.4% (Cs

0.75

0.25

PbI

). These fundamental insights show how the stability limitations of PeNPLs could be addressed

and these materials grown more precisely to improve their performance as polarized light emitters

critical for utilizing them in next-generation display

bioimagin

and communications applications.

关键词

Keywords

references

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Enhanced stability and linearly polarized emission from CsPbI3 perovskite nanoplatelets through A-site cation engineering

DOI：10.1038/s41377-025-02135-y

摘要

Abstract

关键词

Keywords

references

Enhanced stability and linearly polarized emission from CsPbI₃ perovskite nanoplatelets through A-site cation engineering