Influence of Y³⁺, Gd³⁺, and Lu³⁺ co-doping on the phase and luminescence properties of monoclinic Eu:LaVO₄ particles

Abstract

Nano-sized particles of monoclinic-LaVO4 were prepared in a short reaction time of 30 minutes by employing a microwave assisted hydrothermal synthesis in the presence of glycerol, which was used both as a solvent and structure-directing agent. The tetragonal-LaVO4 is known to show strong luminescence properties when doped with Ln(3+), whereas the monoclinic-LaVO4 is usually considered not suitable for luminescence and therefore luminescence properties of monoclinic-LaVO4 doped with Ln(3+) ions are seldom investigated. Due to the scarce amount of research on the topic of luminescence of Ln(3+) doped monoclinic-LaVO4 in this paper a detailed study of solid state luminescence properties, including quantum yields, of nano-sized monoclinic-LaVO4 doped with different molar percentages of Eu(3+) is presented. It was observed that the 12.5%Eu(3+) doped sample showed the strongest luminescence properties. Additionally a study of the influence of different rare-earth ions (Y(3+), Gd(3+), Lu(3+)) co-doped into the particles was performed in order to explore the potential of increasing the luminescence of these materials. Furthermore stable colloidal suspensions of the Eu(3+) doped monoclinic-LaVO4 nanoparticles showing strong red emission could be obtained.

Low-Percentage Ln3+ Doping in a Tetranuclear Lanthanum Polyoxometalate Assembled from [Mo7O24]6– Polyanions Yielding Visible and Near-Infrared Luminescence

“…From an economical point of view lanthanum-based host materials are a good choice, as lanthanum oxide has a much lower price than other rare-earth oxides. Many such materials have been investigated in detail, for example, Eu 3+ :LaVO 4 , Eu 3+ :La 2 (MoO 4 ) 3 , Eu 3+ ,Tb 3+ :La­(1,3,5-BTC)­(H 2 O) 6 (1,3,5-BTC = 1,3,5-benzenetricarboxylate), Eu 3+ , Tb 3+ :LaOHCO 3 , and others. Yet, among the various studied compounds lanthanide POMs doped with only a low percentage of an emissive lanthanide are not common.…”

Structural and Excitation-Dependent Photoluminescence Properties of Bi0.95–xGdxEu0.05PO4 (0 ≤ x ≤ 0.95) Solid Solutions and Their Anticounterfeiting Applications

“…Ln 3+ -doped BiPO 4 remained stable in the monoclinic phase even at 900 °C . It has been reported that in a bismuth-based host material, the intensities of Bi 3+ and Eu 3+ emission increase with the replacement of a part of bismuth by Gd 3+ ions. ,− Thus, a partial replacement of Bi 3+ ions of Eu 3+ -doped BiPO 4 by Gd 3+ ions can exhibit improved emissions from both bismuth and europium ions in the same material. Hence, the material is suitable for excitation-dependent anticounterfeiting applications.…”

“…During the past few decades, crystalline BiPO 4 has been considered an excellent material due to its potential applications in many fields, including catalytic reactions, temperature sensing, microwave dielectric, as a host for luminescent cations, photocatalysts, and separating radioactive elements. − Especially, BiPO 4 has attracted much attention as a host material for doping rare-earth ions because of similar oxidation states and comparable ionic radii of Bi 3+ and Ln 3+ ions . Moreover, BiPO 4 has absorption in the UV region due to the 3 P 1 – 1 S 0 transition of the Bi 3+ ion in the lattice, and hence it exhibits emission at around 440 nm under excitation in the UV region .…”

Emission Enhancement and Color Tuning for GdVO4:Ln3+ (Ln = Dy, Eu) by Surface Modification at Single Wavelength Excitation

“…Till now, researchers have successfully developed a good deal of efficient nanophosphors. Among them, rare-earth vanadate is a highly efficient luminescent material due to the strong absorption of ultraviolet radiation of VO 4 3– groups and the efficient energy transfer from VO 4 3– to activator ions, and they are widely used in phosphor lamps, polarizers, display devices, laser hosts, and catalysts. − Especially, lanthanide activator doped vanadates of Y, La, Gd, and Lu have attracted considerable attention in terms of luminescent applications, specifically, as ideal candidates for light phosphors. − …”