Photoluminescence of rhodamine 6G in plasmonic field of Au nanoparticles: Temperature effects

Influence of temperature on the photoluminescence of rhodamine 6G deposited on 2D array of the gold nanoparticles was studied in the temperature range of 78-278 K. The factor of surface plasmonic enhancement of rhodamine luminescence was found to decrease monotonically with increasing temperature. Electron-phonon scattering and thermal expansion of the gold nanoparticles were considered as two competing physical mechanisms of the temperature dependence of plasmonic enhancement factor. The calculations showed the significant prevalence of the electron-phonon scattering. The temperature induced increase of the scattering rate leads to higher plasmon damping that causes the decrease of plasmonic enhancement of rhodamine 6G luminescence.