A homogeneous fluorescence-electrochemiluminescence sensing platform based on EDTA-RuCOFs: ultrasensitive detection of Cu²⁺ via a chelation-quenching mechanism. - Fan, Tao; Yin, Zhaojiang; Wu, Wenqi; Wei, Guobing; Zhang, Jing; Fan, Hao; Bao, Mengjie; Li, Huijie (Microchimica Acta, 2026)