期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 23, 期 24, 页码 13483-13489出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1cp01731d
关键词
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资金
- Villum Foundation [VKR023115]
- Independent Research Fund Denmark [0136-00024B]
- Erasmus + Program
The study investigates two DNA-AgNCs with large Stokes shifts and efficient red light excitation, emitting at red and near-infrared wavelengths. The research also reveals novel photophysical behaviors for this class of emitters.
We investigated two DNA-stabilized silver nanoclusters (DNA-AgNCs) that show multiple absorption features in the visible region, and emit around 811 nm (DNA811-AgNC) and 841 nm (DNA841-AgNC). Both DNA-AgNCs have large Stokes shifts and can be efficiently excited with red light. A comparison with the commercially available Atto740 yielded fluorescence quantum yields in the same order of magnitude, but a higher photon output above 800 nm since both DNA-AgNCs are more red-shifted. The study of both DNA-AgNCs also revealed previously unobserved photophysical behavior for this class of emitters. The fluorescence quantum yield and decay time of DNA841-AgNC can be increased upon consecutive heating/cooling cycles. DNA811-AgNC has an additional absorption band around 470 nm, which is parallel in orientation to the lowest energy transition at 640 nm. Furthermore, we observed for the first time a DNA-AgNC population (as part of the DNA811-AgNC sample) with green and near-infrared emissive states with nanosecond and microsecond decay times, respectively. A similar dual emissive DNA-AgNC stabilized by a different 10-base DNA strand is also reported in the manuscript. These two examples highlight the need to investigate the presence of red-shifted microsecond emission for this class of emitters.
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