Fluorescence wavelength shifts combined with light scattering for ratiometric sensing of chloride in the serum based on CsPbBr@SiO perovskite nanocrystal composite halide exchanges

• Published in: Dalton transactions : an international journal of inorganic chemistry 2023-10, Vol.52 (42), p.15353-15359
• Main Authors: Zhang, Peng, Chen, Liming, Cai, Xiaoyan, Luo, Binbin, Chen, Tianju, Chen, Haini, Chen, Guoliang, Li, Feiming
• Format: Article
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d3dt01871g

A traditional fluorescence-scattering intensity based ratiometric sensing system utilizes both inherent scattering and fluorescence intensity and has drawn extensive attention owing to its simplicity and self-calibration properties. In this work, we propose a novel ratiometric fluorescence sensing system that combines a fluorescence wavelength shift and scattering in a single window, using second-order scattering (SOS) as the representative scattering signal based on the halide exchange of CsPbBr 3 @SiO 2 perovskite nanocrystal composites. We observe a fast halide exchange within 10 seconds, resulting in an identifiable fluorescence wavelength blue shift, while the scattering wavelength remains relatively constant for self-correction. This system could be applied for ratiometric sensing of Cl − in the serum without any sample treatment. The established wavelength-based ratiometric system demonstrates high reliability and reproducibility, paving a new way for fluorescence sensing. A traditional fluorescence-scattering intensity based ratiometric sensing system utilizes both inherent scattering and fluorescence intensity and has drawn extensive attention owing to its simplicity and self-calibration properties.