Abstract Silver nanoprisms with strong absorption in the near‐IR have been synthesized using a modification of the photoinduced method by illuminating preformed silver seeds under different illumination conditions. Low‐intensity light‐emitting diodes and white light combined with different color filters are used as light sources. The lateral dimensions of the nanoprisms are found to be correlated in a quasilinear fashion with the emission wavelength and the position of the main in‐plane dipole plasmon band. The structural characterization of the Ag nanoparticles, carried out using scanning electron microscopy, transmission electron microscopy (TEM), high‐resolution TEM, and electron diffraction, reveal that the particles are flat and have a single‐crystal face‐centered‐cubic structure. Time‐resolved studies suggest that the nanoprisms are formed by steady consumption of the original Ag seeds with little variation of the aspect ratio after a short induction time.
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