In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC)
Abstract:
Colloidally synthesized cesium lead bromine (CsPbBr 3 ) nanocrystals are considered as one of the most promising luminescent materials due to their excellent photoelectric properties. However, the ligands binding to CsPbBr 3 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 CsPbBr 3 using a dual functional phosphate-ester BODIPY (BDPPO) as an alternative to the traditional oleic acid ligand (BDPPO–CsPbBr 3 ). The PO and –F groups in BDPPO act as a double passivation system, which allows the coordination with unsaturated sites (Cs + or Pb 2+ ), thus effectively managing the defects of CsPbBr 3 . Notably, the hard base (PO) 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 CsPbBr 3 . 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 CsPbBr 3 and the ammonium groups of oleylamine. Consequently, the obtained BDPPO–CsPbBr 3 exhibits better performance than CsPbBr 3 in terms of operational stability. By taking advantage of the different responses of CsPbBr 3 and BDPPO–CsPbBr 3 to environmental stimuli in combination, a variety of luminescent anti-counterfeiting labels are prepared to achieve the encryption and decryption of information. Therefore, stable CsPbBr 3 can be obtained innovatively through a reasonable design of the unique proton-free ligand capable of facilitating capping ligands to bind tightly on CsPbBr 3 .
Type of Medium:
Online Resource
ISSN:
2050-7526
,
2050-7534
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702245-6
Permalink