Observation of microsecond luminescence while studying two DNA-stabilized silver nanoclusters emitting in the 800–900 nm range

Abstract

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...

The effect of inosine on the spectroscopic properties and crystal structure of a NIR-emitting DNA-stabilized silver nanocluster

“…As reported in ref. 11 and 20 , the background amplitude counts can be used as a proxy for creating the red-shifted microsecond-lived luminescence spectrum (Fig. S13–S15 † ).…”

The effect of deuterium on the photophysical properties of DNA-stabilized silver nanoclusters

“…This indicates the presence of a long-lived and red-shifted luminescence. 14 The ns-lived emission intensities are reported as solid traces in Fig. 2B .…”

Probing emission of a DNA-stabilized silver nanocluster from the sub-nanosecond to millisecond timescale in a single measurement

“…11,12 While nanosecond decay times have been reported for DNA-AgNCs using time-correlated single photon counting (TCSPC), longer lived microsecond luminescence has only been very recently reported using pulsed Xe ash lamps or burst mode measurements. [11][12][13] DNA-AgNCs have long been known to possess microsecond lived dark states, which manifest themselves as uorescence blinking in single molecule and uorescence correlation experiments. [14][15][16] Considered to be non-emissive, these dark states have been utilized to generate background-free imaging capabilities by modulating the uorescence intensity output or by exploiting a process called optically activated delayed uorescence (OADF).…”

“…Time gating allows one to extract the OADF signal and generate a background free Anti-Stokes signal. 17 The recent discovery of microsecond emission from DNA-AgNCs, 11,12 led us to wonder whether these states are also able to generate OADF.…”