This paper reports on a chemiluminescence (CL) probe consist of CsPbBr quantum dots (QDs) in organic phase together with Fe(II) and KSO in aqueous medium for the highly selective and sensitive determination of the antibiotic, cefazolin (CFZ). The CsPbBrperovskite QDs prepared by the ligand assisted reprecipitation method, exhibit a narrow fluorescence at 533 nm under 460 nm excitation with a high quantum yield (42 %). The Fe(II) - SO as an ultra-weak CL system is converted to a rather strong CL sensing platform in the presence of organic-phase CsPbBr QDs. It was observed that CFZ exerts an enhancement effect on the CL signal of the designed probe in the linear range of 25 - 300 nM, with a low limit of detection (9.6 nM). The introduced sensor has broad application prospects in biosensing, food detection, and other fields with recovery ranging from 94 to 106 %.
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