A dual-mechanism activated fluorescent chemosensor for nanomolar bismuth(III) detection with demonstrated real-sample, anticounterfeit, swab/strip, smartphone, imaging & logic-gate applications. - Kavanya S; Antony E; Ganesan N; Paul SPM; Ramalingan C; Prabakaran G; Almansour AI; Kumar RS; Raja PB; Nandhakumar R (Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 2026)