Dithizone functionalized CdSe/CdS quantum dots as turn-on fluorescent probe for ultrasensitive detection of lead ion

► A turn-on probe for lead based on dithizone functionalized QDs was constructed. ► Unique properties of QDs were combined with specific Pb2+ affinity of dithizone. ► High sensitivity and selectivity were achieved by combination of QDs with dithizone. ► The fluorescent probe was applied to environmental samples with satisfactory results.