@conference{
author = "Stamenković, Tijana and Radmilović, Nadežda and Dinić, Ivana and Vuković, Marina and Mančić, Lidija and Lojpur, Vesna",
year = "2024",
abstract = "Rare-earth (RE)-based materials are particularly interesting since they possess exceptional optical, electronic, and magnetic properties. These materials consist of a host (matrix) that can be doped with RE ions, which therefore enhance the current properties of the material, and/or provide additional, such as luminescent emission in the visible spectrum. For example, RE-earth oxides, such as ARE2O4 (A = Ca, Sr, Ba, and RE = trivalent rare-earth ions, have great perspectives for producing highly efficient luminescent materials. So far, SrGd2O4 has been a poorly investigated material, even though it has huge potential for many different applications since it possesses high thermal stability, good chemical durability and it is environmentally friendly. The morphology and structure of the obtained particles are mostly influenced by the synthesis methods used for preparing the material. In this work, we will present structural and optical characterization of new material composed of SrGd2O4 doped with Yb3+ and Ho3+, but also, co-doped with Bi3+ ions, prepared via combustion method with glycine as a fuel and citric acid as a chelator. Samples of SrGd2O4 were doped with different Yb3+ (2, 4, 6 at%) ions and constant Ho3+ (1 at%) and Bi3+ (2 at%) concentrations. All samples were heated in the furnace for 1.5 hours at 500 °C and then thermally treated for 2.5 hours at 1000 °C. The pure orthorhombic lattice of SrGd2O4, space group Pnma, was revealed by X-ray diffraction (XRD) (JCPDS Card No.:01-072-6387). Transmission electron microscopy (TEM) discovered agglomerated clusters of spherical particles measuring around 150 nm in size. The inclusion of Bi3+ ions into the structure influenced the morphology since the formation of larger grains was observed, with sizes reaching up to ~1.7 μm, showing fine packing of pyramidal-shaped nanoparticles. The uniform distribution of constitutive elements in the samples was confirmed by energy dispersive spectroscopy (EDS). (activator). A substantial decrease in the energy band gap value was detected using diffuse reflectance spectroscopy (DRS UV-Vis) for this sample. Luminescent properties were evaluated from photoluminescent emission spectra and intensity dependence on excitation power after excitation at 976 nm. Dominant green (550 nm), red (671 nm), and infrared (758 nm) 5F4, 5S2 → 5I8, 5F5 → 5I8, 5F4, 5S2 → 5I7 transition emissions, respectively, are detected in all samples. The sample co-doped with Bi3+ showed the most intense photoluminescent emission.",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program & Book of Abstracts / Third International Conference ELMINA 2024, Belgrade, Serbia, September 9th -13th, 2024",
title = "Resulting Changes in Structural and Optical Properties After Bi3+ Co-doping of SrGd2O4:Ho,Yb Nanoparticles",
pages = "178-179",
url = "https://hdl.handle.net/21.15107/rcub_dais_16776"
}