Plasmon-enhanced photoluminescence from TiO₂ and TeO₂ thin films doped by Eu³⁺ for optoelectronic applications

Abstract

In this work we study the luminescence properties of europium-doped titanium dioxide and tellurium oxide thin films enhanced by gold plasmonic nanostructures. We propose a new type of plasmon structure with an ultrathin dielectric film between plasmonic platform and luminescent material. Plasmonic platforms were manufactured through thermal annealing of the gold thin film. Thermal dewetting of gold film results in spherical gold nanostructures with average dimensions of 50 nm. Both, luminescent TiO2:Eu and TeO2:Eu films were deposited by RF magnetron sputtering from mosaic targets. The morphology of the gold nanostructures was investigated by SEM and TEM, while the composition of oxides film was analyzed by XPS. Luminescence properties were studied on the basis of excitation and emission spectra. The experiments show that the additional dielectric layer enhances the luminescence intensity. Such structures could be potential candidates as phosphors in white LEDs.

Characterization of Na_0.5Bi_0.5TiO₃ Single Crystals by X-ray Diffraction, Scanning Electron Microscopy, X-ray Photoelectron Spectroscopy, Optical Absorption, Electric and Thermoelectric Properties Studies

“…As can be seen, the examined materials are translucent in the visible and near infrared range. As the wavelength increases, a significant decrease in the material's absorption coefficient is observed, which is consistent with the theory of light scattering on defects [34]. The absorption spectrum was fitted to the dependence expressed by [35]: where α denotes the linear absorption coefficient of the material, hυ denotes the photon energy, Eg denotes the band gap energy.…”

Tailor Traps in Bi3+-Doped NaGdGeO4 Phosphors by Introducing Eu3+ Ions to Switch Multimodal Phosphorescence Emission

“…The binding energy peaks are enlarged, demonstrated in Figure S3b. Two additional peaks at 157.5 and 163.0 eV corresponding to 4f 5/2 and 4f 7/2 of Bi 3+ ions and 138.6 and 143.7 eV corresponding to 4d 3/2 and 4d 5/2 of Eu 3+ ions appeared, , indicating the presence of trivalent Bi and Eu without any secondary valence states, respectively. Figure c gives the crystal structure of NGGO, based on the olivine structure type, which exhibits a three-dimensional crystal structure consisting of corner- or edge-shared NaO 6 , GdO 6 , and GeO 4 polyhedra .…”

Preparation of a nano insecticide using dried Lawasonia Inermis leaves with TeO2 and investigate its effectiveness against house flie

“…They can also be used in the production of optical coatings and lenses. In catalysis, TeO2 nanoparticles have been investigated for their potential as catalysts for various reactions, including the reduction of nitroarenes and the oxidation of alcohols [3][4][5].…”