A smartphone-based ratiometric fluoroprobe based on blue-red dual-emission signals of thiochrome and copper nanoclusters for sensitive assay of metam-sodium in cucumbers

A dual-mode green emissive fluorescent probe for real-time detection of doxycycline in milk using a smartphone sensing platform

“…As a result, this method using recognition with the naked eye significantly limits the ability to analyze visually. 19 Fortunately, smartphones can accurately recognize fluorescent color variations assisted by APP with RGB (Red, Green, and Blue) values. 20 Furthermore, the analysis method based on digital images can convert fluorescence reaction images into measurable data related to the concentration of the analyte, 21,22 which has broad application prospects in on-site monitoring.…”

A Ratiometric Molecularly Imprinted Sensor for Visual Detection and Removal of α-Dicarbonyl Compounds Based on Biomass Carbon Dot-Embedded Fluorescent Covalent Organic Frameworks

“…However, single-emission fluorescent sensors may be interfered with by external factors such as the environment and the instrument, which can easily lead to false-positive results . Ratiometric fluorescence sensors can avoid this problem by achieving self-calibration with two or more different wavelengths of fluorescence, thus improving the reliability of detection. − In addition, compared with single-emission fluorescence sensors, ratiometric fluorescence sensors present more colors and more significant variations, which facilitates the acquisition of sensor images and color output by smartphones, and greatly improves the sensitivity and accuracy of onsite visual inspection. − …”