Photoluminescence modulation of ZnO via coupling with the surface plasmon resonance of gold nanoparticles

Abstract

In this letter, we study how coupling between AuNPs and ZnO thin films affects their emission properties. The emission intensity of ZnO thin films changes when Al 2 O 3 spacer layer of different thickness are included in ZnO/Au films, consistent with theoretical predictions. The emission properties are also controlled using the polarization of the excitation source. Emission properties depended on the polarization of the excitation source

Mechanism of Laser-Induced Bulk and Surface Defect Generation in ZnO and TiO2 Nanoparticles: Effect on Photoelectrochemical Performance

“…In addition to strong bandgap PL centered at ca. 385 nm (3.22 eV) attributable to excited electrons near the band edge, 63,64 we observed a green emission, in agreement with previous reports. 63,[65][66][67][68][69] We chose the z-scale of the graphs such that weaker emissions are visible; as a result the strong bandgap emission appears white.…”

“…63 Damping weakened with increasing separation distance, whereas plasmon enhancement was active even at large separations of up to 30 -40 nm. 63 In our work, the surfactant-free laser-generated AuNPs were in direct contact with the ZnO particles, as depicted in Figure 6. Figure 6: Illustration of the physical origins of the different PL intensities that we observed in ZnO-AuNP composites as a function of laser irradiation dose.…”

Ag/ZnO hybrid systems studied with scanning tunnelling microscopy-based luminescence spectroscopy

“…1 In most examples, ZnO nanostructures, e.g., rods, pillars, or spheres, are functionalized either with silver 18,19 or gold particles. 20,21 Their density and geometry are typically derived from electron-microscopy studies, while absorption and photoluminescence experiments are used to explore their electromagnetic coupling to the oxide support. Silver deposition was found to enhance the UV luminescence of ZnO, indicating an energy transfer from metal plasmons to oxide excitons.…”

Insights into non-noble metal based nanophotonics: exploration of Cr-coated ZnO nanorods for optoelectronic applications

“…Although there is an enhancement in the value of the NBE however it is lower than the typical values of the enhancement ratio that were reported for other metals like Au, Ag, Pt and Al. 25,26,64,65 It is worth to mention here that the exciton-plasmon coupling strength depends prominently on the magnitude of the real part of dielectric constant of the metal (the real part of the dielectric constant of the metal must be negative and its magnitude must be greater than that of the semiconductor). For Cr, the magnitude value of the real part of dielectric constant is not as large as for the other plasmonic metals like Ag, Au and Al in the UV and visible region of the electromagnetic spectra, therefore, it is expected that the effect of plasmon coupling will be less pronounced in the case of Cr.…”