Figure 3

PL spectra of Pt, Au and Ag NCs embedded in silica (a) and sapphire (b–d) matrices. Laser excitation corresponds to 355 nm wavelength and a low pump fluence of 0.5 mJ/cm2.
PL spectra of Pt, Au and Ag NCs embedded in silica (a) and sapphire (b–d) matrices. Laser excitation corresponds to 355 nm wavelength and a low pump fluence of 0.5 mJ/cm2.