Fig. 2: Room-temperature ultranarrow photoluminescence (PL) and ultrashort PL lifetimes observed in the glass QDs-nAg (where QDs: quantum dots, nAg: silver nanoparticles) nanocomposites.
From: Ultrafast photoluminescence and multiscale light amplification in nanoplasmonic cavity glass
a, b PL spectra (a) and normalized time-resolved fluorescence (b) of the QDs in water (pink) and the NBP:CdTe (orange) and NBP:CdTe,nAg (green) nanocomposites. Both nanocomposites show a peak at 502.5 nm corresponding to exciton emission and a broadband PL corresponding to surface defects. The nanocomposite co-doped with QDs and nAg shows an enhanced and narrowed QD PL (full width at half maximum FWHM = 13 nm) and an almost three orders-of-magnitude decreased PL lifetime. c Image of the sample PL when excited with a 488 nm laser. d Image of the narrow-emission decay time from the streak camera with the spectrum (green line) and decay time curve (blue line). e, f Simulations (with lines to guide the eye) of the PL emission enhancement factor γ ̃em (e) and total decay enhancement (Purcell factor) γ ̃tot (f) of a CdTe QD situated at a distance z from a single nAg particle (light blue; inset: zoomed in) and in-between two nAg particles separated by a 2z distance (dark green).
