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Photophysical study of Fluorescent Zn (II) Sensor. [Display omitted] • Fluorescence study of the rhodamine-quinoline type of Al3+sensor. • Absorption spectra of rhodamine-based fluorescent Al3+ chemosensor. • Bioimaging study of FRET-based chromium(III) sensor. • HOMO-LUMO structures of rhodamine-based colorimetric Cu(II) sensors. • Fluorescence emission study of rhodamine-based Fe3+chemosensor. • Live cell imaging of Rhodamine-based Hg2+ chemosensor. Rhodamine-based photoresponsive sensors have emerged as a focal point in the realm of chemical sensing, garnering substantial attention owing to their exceptional sensitivity, straightforward implementation, and real-time detection capabilities across diverse analytes. Within this class, a notable substituent stands out for its well-established reputation, characterized by its electron-donating prowess and customizable coordination cavity, resulting in a heightened sensitivity towards various metal ions. The comprehensive examination of these sensors in the review centers on key parameters such as the detection target, detection limit, detection solution system, and detection method. Notably, the inclusion of an array of metal ions in the discussion contributes to the versatility of these sensors. To enhance the readability and applicability of the review, a detailed exploration of the indirect sensing strategy is presented, showcasing its efficacy in achieving sensitive detection, especially for anions and other species. This strategic approach not only broadens the scope of application but also underscores the versatility of rhodamine-based sensors, making this review a valuable resource for researchers and practitioners in the field of chemical sensing. [ABSTRACT FROM AUTHOR]

[Display omitted] • Facile synthesis of fluorescent CDs from Schyzium cumini leaves by hydrothermal process. • CDs displayed excitation dependent emission with quantum yield of 15.9 %. • CDs have been used as sensing probe for the detection of Fe3+. • Low limits of detection and >85 % recovery in real water samples. • The synthesized CDs exhibits good biocompatibility and low cytotoxicity. In this study, carbon dots (CDs) derived from Syzygium cumini leaves were synthesized through a hydrothermal process and employed as a sensing probe for the highly sensitive and selective detection of Fe3+. The synthesized CDs underwent comprehensive analysis to discern their functional groups, composition, morphology, nature, and size. The CDs exhibited excitation-dependent emission fluorescence with a quantum yield of 15.9 %. Notably, Fe3+ induced a substantial quenching effect on the fluorescence intensity of the CDs compared to other metal ions. The developed fluorescent probe facilitated the selective detection of Fe3+ within a linear range of 0–300 µM, exhibiting a low detection limit (LOD) of 0.13 µM. Moreover, the applicability of the fluorescent probe was validated in real water samples, with the recovery and Relative Standard Deviation (RSD) values serving as indicators of specificity and selectivity. Additionally, the CDs were assessed for cell imaging in both normal human and cancer cells. The findings indicate that the produced CDs exhibit minimal cytotoxicity and outstanding biocompatibility, underscoring their potential for bioimaging applications. [ABSTRACT FROM AUTHOR]