Publication date: 8th July 2026
Silver sulfide (Ag2S) nanocrystals are promising candidates as fluorescence markers, because they show emission at 1200 nm, and the emission intensity strongly changes with temperature. Hence, the fluorescence of these particles could be used to probe the temperature inside biological cells. To explore the fluorescence mechanisms, we combined synthetic studies with optical investigations on ensembles and performed single particle fluorescence spectroscopy.
The fluorescence properties of these emerging light emitting materials reveal many novel phenomena such as a decrease of the fluorescence intensity by 90 % if the temperature is increased from 10 to 50 °C. Additionally, the fluorescence intensity is partially quenched upon illumination and reversibly recovers within seconds. Two distinct fluorescence lifetime components in the 1 ns and 100 ns range hint to different recombination channels, and first measurements if single particle spectroscopy show pronounced fluorescence intermittency.
Here we show how the fluorescence properties are depending on different surface modifications such as molecular and ionic surface treatments. Finally, we suggest a model for the fluorescence mechanism in silver sulfide nanocrystals.
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