Issue 43, 2023

Dual functional phosphate-ester BODIPY regulation achieved stable CsPbBr3 nanocrystals for optical anti-counterfeiting

Abstract

Colloidally synthesized cesium lead bromine (CsPbBr3) nanocrystals are considered as one of the most promising luminescent materials due to their excellent photoelectric properties. However, the ligands binding to CsPbBr3 are prone to being detached from the surface due to proton exchange, which leads to the formation of high-density defects, thus reducing their stability significantly. Herein, it is proposed to synthesize stable CsPbBr3 using a dual functional phosphate-ester BODIPY (BDPPO) as an alternative to the traditional oleic acid ligand (BDPPO–CsPbBr3). The P[double bond, length as m-dash]O and –F groups in BDPPO act as a double passivation system, which allows the coordination with unsaturated sites (Cs+ or Pb2+), thus effectively managing the defects of CsPbBr3. Notably, the hard base (P[double bond, length as m-dash]O) shows an intense interaction with the hard acid (Cs+) according to the soft–hard–acid–base theory, which ensures high efficiency in stabilizing the BDPPO ligand capped on CsPbBr3. Moreover, the BDPPO substitute can be used to create an acid-free environment, which eliminates the possibility of proton transfer, thus enhancing the hydrogen-bonding interaction between the Br terminal in CsPbBr3 and the ammonium groups of oleylamine. Consequently, the obtained BDPPO–CsPbBr3 exhibits better performance than CsPbBr3 in terms of operational stability. By taking advantage of the different responses of CsPbBr3 and BDPPO–CsPbBr3 to environmental stimuli in combination, a variety of luminescent anti-counterfeiting labels are prepared to achieve the encryption and decryption of information. Therefore, stable CsPbBr3 can be obtained innovatively through a reasonable design of the unique proton-free ligand capable of facilitating capping ligands to bind tightly on CsPbBr3.

Graphical abstract: Dual functional phosphate-ester BODIPY regulation achieved stable CsPbBr3 nanocrystals for optical anti-counterfeiting

Supplementary files

Article information

Article type
Paper
Submitted
21 Aug 2023
Accepted
25 Sep 2023
First published
26 Sep 2023

J. Mater. Chem. C, 2023,11, 15065-15073

Dual functional phosphate-ester BODIPY regulation achieved stable CsPbBr3 nanocrystals for optical anti-counterfeiting

X. Feng, R. Li, J. Liu, Q. Ma, Y. Yang, W. Zhang and J. Liu, J. Mater. Chem. C, 2023, 11, 15065 DOI: 10.1039/D3TC02992A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements