Developing highly efficient electrochemiluminescence (ECL) emitters of carbon dots (CDs) with finely tunable emission wavelength is crucial for multiplexed bioassays and imaging. Despite of great success in enhancing ECL efficiency of CDs, the simultaneous modulation of ECL efficiency and emission wavelength, along with the deep understanding the mechanism in molecular level remain elusive. Herein, we reported a facile phosphorus (P) doping route to prepare CDs having fine-tuned ECL wavelength from 425 to 645 nm, the widest ever reported, along with the significantly boosted efficiency (relative to the Ru(bpy)32+/K2S2O8 system) from 10.6% to 57.4%. The molecular mechanism was explored by the kinetics studies and theoretical calculation. It was disclosed that P doping not only imported shadow trapping states but also promoted a significant intramolecular charge transfer, which jointly induced the red-shift and boosted the ECL performance of CDs. Excellent ECL emission tunable CDs opening enticing perspectives for construct the wavelength-resolved ECL biosensor for simultaneous detection of multiple biomarkers in the early diagnosis of diseases.

Continuous modulating highly efficient electrochemiluminescence of carbon dots up to 220 nm via shadow trapping states and intramolecular charge transfer

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ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.