Y3(Al/Ga)5O12:Ce3+,Cr3+,Nd3+ nanocrystals with strong persistent luminescence in the NIR-II spectral region, which are highly desired for bioimaging, have been synthesized by a salt microemulsion method.
Oriented arrays of silver nanorice or nanocarrots in stretched polymer films show polarization-dependent transmission of near-infrared light over a wide spectral region.