【摘 要】
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Up to date,solid-state carbon dots (CDs) with bright red fluorescence have scarcely achieved due to aggregation-caused quenching (ACQ) effect and extremely low quantum yield in deep-red to near infrared region.Here,we report a novel fluorine-defects induc
【机 构】
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School of Chemistry and Chemical Engineering,Anhui Key Laboratory of Modern Biomanufacturing,Anhui U
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Up to date,solid-state carbon dots (CDs) with bright red fluorescence have scarcely achieved due to aggregation-caused quenching (ACQ) effect and extremely low quantum yield in deep-red to near infrared region.Here,we report a novel fluorine-defects induced solid-state red fluorescence (λem =676 nm,the absolute fluorescence quantum yields is 4.17％) in fluorine,nitrogen and sulfur co-doped CDs (F,N,S-CDs),which is the first report of such a long wavelength emission of solid-state CDs.As a control,CDs without fluorine-doping (N,S-CDs) show no fluorescence in solid-state,and the fluorescence quantum yield/emission wavelength of N,S-CDs in solution-state are also lower/shorter than that of F,N,S-CDs,which is mainly due to the F-induced defect traps on the surface/edge of F,N,S-CDs.Moreover,the solid-state F,N,S-CDs exhibit an interesting temperature-sensitive behavior in the range of 80-420 K,with the maximum fluorescence intensity at 120 K,unveiling its potential as the temperature-dependent fluores-cent sensor and the solid-state light-emitting device adapted to multiple temperatures.
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