Visible photoluminescence of gold nanoparticles prepared by sputter deposition technique in a room-temperature ionic liquid

- Gold nanoparticles were prepared in an ionic liquid at room temperature.
- Photoluminescence spectra of gold nanoparticles were observed in an ionic liquid.
- Photoluminescence spectra show a red-shift, as the excitation wavelength increases.
- Decay profile and quantum yield were measured at various excitation wavelengths.