Recently, borate glasses have been widely investigated due to their unique qualities such as high optical transmission, low refractive index, and high thermal expansion coefficient [1]. Due to these characteristics, such glasses are suitable for being doped with trivalent lanthanides to explore potential laser applications. For this purpose, Nd3+, characterized for possessing near infrared...
To detect changes or events produced by physical phenomena in our environment, it is necessary to use sensors. The presence of some gases on high concentrations can be dangerous for the living beings and its early detection is of vital importance. Nowadays there are several sensing devices, among them those with luminescent properties represents an attractive option, because the interaction of...
The synthesis and characterization of calcium tungstate-based micro-nanophosphors will be presented. These materials were prepared using the spray pyrolysis technique. Based on Scanning Electron Microscopy measurements, both CaWO4 and CaWO4:Eu (III) exhibit a quasi-spherical shape. CaWO4 displays blue luminescence originating from electron transitions within unperturbed WO4 complexes. In...
Multimodality nanoplatforms play a crucial role in advancing medical interventions by integrating multiple functionalities into a single system. However, issues like intricate production processes and biocompatibility persist. Herein, a facile synthesis of a biomaterial-based mesoporous nanocarrier, HAp:Nd+SPIONs@mSiO2, loaded with the near-infrared (NIR) emitting dye indocyanine green (ICG)...
This work studied the structural and luminescent properties of CsVO3 crystals synthetised by the Solid State Reaction, and the effect of the silica coated of the cesium metavanadate (CsVO3/SiO2) on the properties described above. The Solid State Reaction is a versatile and eco-friendly technique potentially applicable in the industry. The X-Ray Diffraction patterns shows that the crystalline...
In this project, europium-doped yttrium phosphate powders (YPO4:Eu3+) with a concentration of 6 mol% were synthesized by the hydrothermal method. The hydrothermal reaction conditions were 190 °C for 3 hours. Heat treatment was carried out at 750 °C for 3 hours to form the crystal structure. The addition of glycerol as a cosolvent was to prevent agglomeration and promote dispersion of the...
Challenges in technology have been significant in reducing the size of components such as transistors, antennas, MEMs, LEDs, lasers, and many devices for biomedical and environmental improvement applications. Therefore, the concept of nanotechnology has played a significant role in the manufacturing and study of new materials at this scale. In the photonic area, the interaction between light...
Since the discovery of the red light-emitting diode (R-LED) by Nick Holonyak in 1962, LEDs have become indispensable in many everyday applications, from lighting on display screens and smartphones, to laser diodes, even in specialized lighting in horticulture. In this direction, tungsten-based compounds are very attractive due to their high thermal stability greater than 800 °C and their high...
In recent years, materials based on rare earth oxides have gained great importance in modern technology, due to the innovative properties they have. For application in different scientific-technological branches, ranging from the synthesis of hybrid materials to the development of new ceramic materials. The study of nanoparticles based on cerium oxides using the sol-gel method has become of...
Lanthanide complexes are a new type of luminescent materials used for several optical applications, including biological fluoro-immuno assays, lasers, solid-state lighting, electroluminescent devices, and Light Emission Diodes (LEDs). The Direct excitation of Lanthanide ions inefficient absorption is due to forbidden transitions resulting in low quantum yield. However, it has been observed...
Material Physics focuses on synthesis and characterization of materials for different applications, such like tunable color iluminants, LED applications, construction, and even medicine. Keeping this in mind, the incorporation of rare earths as crystal impurities in the host material is quite important, because it could change the electrical and optical properties in order to favor its...
There is a need to develop composite phosphors for white-emitting lamps based on blue LEDs that can be efficiently activated and generate light with high color rendering index (CRI). In particular, there are only few red-emitting luminescent materials excited with blue photons for CRI improvement of the illumination devices. In this investigation, we report a two-stage energy-efficient...
The present work synthesized Al2(WO4)3 activated with Dy, using the solvent evaporation methodology. Deionized water was used as a solvent, AlCl3, DyCl3 and Na2WO4 as reagents; Then it was subjected to heat treatment at 400ºC for 2 hours. The X-ray diffraction patterns present high intensity peaks related to the orthorhombic phase of Al2(WO4)3, according to letter PDF-70-4478. With a...
This project focuses on the study of europium due to its luminescent properties and various technological applications. The general issue with lanthanides is their low energy absorption,attributed to deficiencies in the 𝑓−𝑓 transition bands. Europium, dissipates energy through vibrations, which is not conducive to radiative processes. A solution is to add functional group bonds that generate...
Zinc phosphate glasses with varying compositions of Mn2+ and Yb3+ were successfully synthesized using the conventional melt and quenching method. Mn2+ exhibits simultaneous green-orange emission through four- and six-fold coordination upon excitation at 350 nm, and via up-conversion when excited at 980 nm. Yb3+ shows its characteristic 976 nm emission due to the 2F5/2→2F7/2 transition when...
Luminescence quenching in porous silicon has been widely employed due to its sensitivity to numerous molecular species acting as quenchers. Various molecular interactions can induce luminescence quenching, including excited state reactions, molecular rearrangement, energy transfer, complex formation in the basal state, and collisional quenching. Collisional inhibition, also known as dynamic...
Nanographite (NG), a nanoscale allotrope of carbon with sizes below 10 nanometers, has emerged as a fascinating material due to its unique properties in the optical and electronic fields. These nanostructures exhibit a series of intriguing characteristics that make them highly desirable for a variety of applications, ranging from advanced electronic devices to sensors and...
In this work, the Li3Ba2La3(MoO4)8:(Eu3+, Tb3+) phosphor was investigated due to its excellent luminescence emission properties in the red spectral range (615~620 nm) under excitation with a blue LED (Light Emitting Diode). The phosphors were synthesized by the combustion and sol gel methods, at different Eu and Tb concentrations, in order to find the optimal luminescence conditions and...
Er-doped CdO-V2O5-ZnO-B2O3 inverted glasses were synthetized by the melt-quenching method, using proportions of 80-5.0-2.5-12.5 mol% of CdO-V2O5-ZnO-B2O3, respectively, which were doped with different mol% of Er. The structural analysis, carried out by X-Ray diffraction patterns recording, showed an amorphous structure in all Er doping range. This fact was also verified by the line shape of...
There is a growing interest in the search for inverted glasses [1], which exhibit a low density of high-energy phonons. Due to the high energy phonons are the main source of non-radiative relaxations of lanthanide ions embedded in glasses, inverted glasses might show superior photoluminescence performance. Based on this issue, the present work aims to prepare and analyze the photoluminescence...
We report on the fabrication and characterization of TiO2 nanoparticles immobilized in porous silicon (p-Si) structures; p-si was obtained by chemical anodization using crystalline silicon (c-Si) substrates with varying resistivity. This study used two types of TiO2 nanoparticle nanoparticles to compare their properties: one synthesized by hydrothermal process and the other commercial....
This work studied the structural and luminescent properties of CsVO3 crystals synthetised by the State Solid Reaction doped with Nd3+ ion (0.5, 1, 1.5, 3, 4.5 and 6 mol%). The State Solid Reaction is a versatile and eco-friendly technique potentially applicable in the industry. The X-Ray Diffraction patterns shows that the crystalline structure is the characteristic of the CsVO3, the...
The search for sustainable and efficient solutions in the solid-state lighting field has gained significant importance due to its environmental impact. One such solution is light-emitting diodes (LEDs), which offer higher energy efficiency and durability than conventional lighting technologies such as incandescent bulbs and fluorescent tubes. Nowadays, LED technology has evolved to the...
Compounds synthesized from lanthanide elements have become indispensable due to their high efficiency in applications where their luminescent properties are taken advantage of. Among these can be found phosphors for illumination in screens or night vision, inks for security labels, lasers, photocatalysis, bioprobes, nanoscopy or in light-activated drug delivery. In the present work, through...
Cesium metavanadate (CsVO3) materials have recently received extensive attention due to their out-standing luminescent properties.In this study, the synthesis of CsVO3 and CsVO3:Er3+ was conducted using the solid-state reaction method.Through a thermal treatment at 400°C for 5 hours,the crystalline phase corresponding to PDF 00-70-0680 was obtained,achieving a phase purity ofapproximately 94%...
Nowadays, vanadate-based materials have been a topic of studying due to their interesting structures and electronics, optics, and magnetic properties. In most cases, the structural characteristics are convenient to be impurified with trivalent lanthanide and/or transition metals, which opens the possibility of applications in deep-red LEDs, W-LED, among others [1]. Moreover, the vanadate...
Recently, research on vanadates has generated genuine interest due to their high luminescent efficiency [1], resonant excitation with commercial NUV chips (λex = 350 nm) [2], high thermal stability [3], excellent chemical stability [4], and extraordinary dopant solubility. These qualities make vanadate matrices suitable for the incorporation of lanthanides to modulate their emissions to...
The synthesis of hydroxyapatite and calcium phosphate of nanometric and micrometric sizes is carried out respectively. Were doped with erbium and ytterbium,with the aim of creating a biomarker who underwent chronic tests on Dania Magna. The synthesis and characterization of Ca5(PO4)3(OH) (hydroxyapatite or HAp) enriched with Er (III) and Yb (III) ions was carried out. The synthesis of calcium...
In this work, a synthesis process was carried out to obtain fluorescent quantum dots from cucumber peel in order to produce white visible light.
The production of quantum dots consisted in a dehydration process followed by a milling procedure to obtain powders of the dehydrated peels. Subsequently, two thermal treatments were carried out at 100 °C and 200 °C to equal quantity of powders....
In recent years, rare earth metals such as erbium have gained great importance in various technological applications. At the same time, borate glasses have emerged as another crucial material due to their ability to form glass even at relatively low cooling rates and under pressure alone[1]. B2O3 glasses facilitate melting, reduce viscosity and surface tension, which improves the material's...
Zinc oxide (ZnO) is a material with multiple electrical and optical properties, in this work we studied the incorporation of the Er$^{3+}$ ion into the host of ZnO synthetized by the Sol-Gel. Changes in the luminiscent properties of ZnO:Er$^{3+}$ are directly correlated with the incorporation of Er$^{3+}$ ion (0.25, 1.25, 2.25, y 3.25 mol%). The Near-Infra Red (NIR) emission of ZnO:Er$^{3+}$...
The importance of water treatment cannot be ignored, especially now that the distribution and availability of this resource have been negatively affected, and it is essential for our survival. Photocatalysis is a technique used to degrade the organic pollutants present in industrial water. Titanium dioxide (TiO2) is extensively utilized as a photocatalyst due to its chemical stability, easy...
The aim of this work is to obtain fluorescent white light from quantum dots processed from avocado peel with different thermal treatments and mixtures.
The initial process consist in dehydrating the peel with sunlight for a week. After that, it is grounded and separated into three groups to apply different heat treatments in two of them, being 100°C and 200°C.
Three suspensions containing...
Aerogels are very novel materials due to the large number of potential applications that the scientific community is currently investigating. This is due to their extreme porosity and the ability to be synthesized using a wide variety of compounds. Although the excellent thermal and acoustic properties of aerogels are guaranteed by the interconnection of their particles at the nano and...
