Self-trapped Exciton in Gold-doped Silver Nanoclusters embedded in PVP matrix

Russel Cruz Sevilla^1*, Ruth Jeane Soebroto¹, Chi-Tsu Yuan¹

¹Department of Physics, Chung Yuan Christian University, Taoyuan City, Taiwan

* Presenter:Russel Cruz Sevilla, email:russelcruzsevilla@gmail.com

The presence of self-trapped excitons (STE) in the photoluminescence (PL) mechanism of a fluorescent material can cause the PL spectrum to be broad and exhibits large Stokes shift. These phenomena exist due to the strong interaction between the exciton and phonon. The temperature-dependent PL were measured to determine the coupling strength, quantified by Huang-Rhys factor (S), between the exciton and phonon in Gold-doped silver nanocluster embedded in PVP matrix (Au-AgNCs@PVP). The S were calculated to be ~12. The high S (S > 1) implies the strong exciton-phonon interaction strength and with such values, it can be concluded that the emissive state originated from STE.

Keywords: exciton-phonon coupling, photoluminescence, self-trapped exciton, silver nanoclusters