Au nanoparticle’s plasmonic nearfield induced photoluminescence enhancement of fluorophores

Gold nanoparticles in fused quartz substrates were synthesized with ion implantation using the Western Michigan University’s particle accelerator lab. Localized Surface Plasmon Resonance with respect to ion fluence (1 x10¹⁶ to 9x10¹⁶ atoms/ cm²) at fixed ion beam energy (70 keV) was studied. Rutherford Backscattering Spectrometry and UV/Vis techniques were used to quantify Au concentration and detect the formed nanoparticles respectively within the substrate. The investigation of enhanced electric fields of embedded nanoparticles with incident electromagnetic wave were used to amplify the photoluminescence intensity of dye and various perovskites nanocomposites. Steady state time resolved photoluminescence spectroscopy were used to investigate the emission enhancement and the energy transfer between the fluorophore and the metal nanoparticle. It was observed that the photoluminescence enhancement of perovskites in the vicinity of Au nanoparticles had a direct relationship with the ion implanted fluence. The photoluminescence intensity was quenched for C515 dye indicating the energy transfer from molecule to the Au nanoparticle. The photoluminescence enhancement was obtained for the lead halide perovskites and the maximum relative enhancement of ~29 times was obtained in CsPbI₃.