Production of photochromic nanocomposite film via spray‐coating of rare‐earth strontium aluminate for anti‐counterfeit applications

Luminescence ◽  
2021 ◽  
Author(s):  
Omnia M. Mokhtar ◽  
Yasser A. Attia ◽  
Ahmed R. Wassel ◽  
Tawfik A. Khattab
Keyword(s):  
Rare Earth ◽  
Nanocomposite Film ◽  
Spray Coating ◽  
Strontium Aluminate

scholarly journals Calculation Of The Crystal Field Parameters For Eu3+ Doped In SrAl2O4 And SrIn2O4 Spinels

2012 ◽  
Vol 56 (1) ◽  
pp. 132-138
Author(s):  
M. L. Stanciu
Keyword(s):  
Experimental Data ◽  
Rare Earth ◽  
Crystal Field ◽  
Energy Levels ◽  
Superposition Model ◽  
Strontium Aluminate ◽  
Intrinsic Parameters ◽  
Broadband Emission ◽  
Host Materials ◽  
Crystal Field Parameters

AbstractStrontium aluminate (SrAl2O4) and the indium aluminate (SrIn2O4) spinels have been proven to be efficient host materials, which offer the possibility of generating broadband emission after doping with rare earth trivalent ions. The present work is devoted to the calculation of the crystal field parameters and the energy levels of the trivalent europium doped in SrAl2O4 and SrIn2O4 spinels, using the superposition model of the crystal field. Using the intrinsic parameters for Eu3+-O2− bonds, and the geometry structure of the each crystal, we modeled the CFPs and simulated the low-lying energy levels schemes. The obtained results are compared with the experimental data and discussed.

Structures and Optical Properties of Nanoforest-Like Carbon Nanotubes Decorated with Nanoparticles of Strontium Aluminate Doped with Rare-Earth Elements

MRS Advances ◽  
2018 ◽  
Vol 3 (1-2) ◽  
pp. 121-126
Author(s):  
Patsy Y. Arquieta Guillén ◽  
Alena Borisovna Kharissova ◽  
Beatriz Ortega García ◽  
Oxana V. Kharissova
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Metal Oxides ◽  
Spray Pyrolysis ◽  
Metal Oxide Nanoparticles ◽  
Strontium Aluminate ◽  
Fluorescent Properties ◽  
Multi Wall Carbon Nanotubes

ABSTRACTNowadays, carbon nanotubes have a lot of applications in daily life, being applied in the fabrication of cellphones, computers, nanotransistors, among many others. Currently, their new applications in biotechnology area are in research, in particular in order to find new biosensors with fluorescent properties applying on the basis of multi-wall carbon nanotubes (MWCNTs). In this work, the obtaining of carbon nanoparticles having fluorescent properties via spray pyrolysis is presented. Synthesis, properties, structural peculiarities, and applications of nanobuds and related nanostructures are discussed. MWCNTs, decorated with strontium aluminate SrAl12O19 and doped with rare-earth elements, were synthetized from distinct organic precursors and the corresponding metal oxides. The metal oxides used were Samarium (Sm), Europium (Eu), Neodymium (Nd), Lanthanum (La), Cerium (Ce) and some their combinations.The synthesis was carried out on the surface of optical fibres to obtain a uniform growth of forest-like MWCNTs, adding to metal oxide nanoparticles to their surface. The preparation of composites was carried out by spray pyrolysis techniques in dry nitrogen atmosphere in the temperature range from 780 to 850°C. The formed products were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), FTIR spectroscopy, Raman spectroscopy and UV/visible spectroscopies. The analysis of the obtained data shows that the deposited nanoparticles are in the range of size 20-60 nm being uniformly distributed on the surface of MWCNTs. The samples, obtained at different temperatures and with doping metal oxides added to SrAl12O19, show different fluorescence behavior. The best results were observed with lanthanum oxide as a dopant. Possible applications as persistently luminescent phosphors for the formed MWCNTs-supported luminescent materials are proposed.

Photochromic properties of rare-earth strontium aluminate luminescent fiber

2011 ◽  
Vol 12 (7) ◽  
pp. 875-879 ◽  
Author(s):  
Xuefeng Guo ◽  
Mingqiao Ge ◽  
Jumei Zhao
Keyword(s):  
Rare Earth ◽  
Strontium Aluminate ◽  
Photochromic Properties

Mechanoluminescence glow curves of rare-earth doped strontium aluminate phosphors

2011 ◽  
Vol 33 (3) ◽  
pp. 444-451 ◽  
Author(s):  
B.P. Chandra ◽  
V.D. Sonwane ◽  
B.K. Haldar ◽  
S. Pandey
Keyword(s):  
Rare Earth ◽  
Strontium Aluminate ◽  
Rare Earth Doped

X-ray investigations of solid solutions of monocalcium aluminate and monostrontium aluminate important phases in cement and phosphorescence materials

2014 ◽  
Vol 29 (2) ◽  
pp. 141-146 ◽  
Author(s):  
H. Pöllmann ◽  
R. Kaden
Keyword(s):  
Solid Solution ◽  
Rare Earth ◽  
Solid Solutions ◽  
Calcium Aluminate ◽  
Solid Solution Series ◽  
Strontium Aluminate ◽  
X Ray ◽  
Hydration Behaviour ◽  
Orthorhombic Modification ◽  
High Temperature Form

Calcium monoaluminate is the main phase in calcium aluminate cements and participates in the hydration, forming calcium aluminate hydrates. The amount of incorporation of foreign ions influences the hydration behaviour. Strontium aluminate is an important phase in producing phosphorescent materials when doped with rare-earth elements (REE) such as Eu, Dy, and La. These monoaluminates occur in different forms. Monocalcium aluminate forms a monoclinic and an orthorhombic modification, whereas monostrontium aluminate forms a monoclinic low-temperature and a hexagonal high-temperature form. Monoclinic calcium monoaluminate and monoclinic strontium aluminate form a partial solid-solution series. The hydration behaviour of different solid solutions was also investigated using calorimetry. The newly formed strontium aluminate hydrates could be identified while similar strontium aluminate hydrates are formed. Solid solutions of strontium- and calcium-aluminate hydrates will be investigated.

scholarly journals Spray Coating Luminescence Layers on Glass for Si Solar Cells Efficiency Enhancement

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6884
Author(s):  
Katarzyna Znajdek ◽  
Natalia Gwardjan ◽  
Aleksandra Sosna-Głębska ◽  
Maciej Sibiński
Keyword(s):  
Solar Cells ◽  
Rare Earth ◽  
Solar Spectrum ◽  
Spray Coating ◽  
Efficiency Enhancement ◽  
Active Materials ◽  
Si Solar Cells ◽  
Absolute Efficiency ◽  
Pv Cell ◽  
Deposition Technology

The article presents experimental research focused on the improvement of solar cells efficiency using the photoluminescence down-shifting effect. In the paper, the authors present the results of solar cells performance enhanced with the proposed solution. As light energy converted active materials, rare earth elements of europium and dysprosium were implemented. In the experiments, luminescent layers were deposited on top of photovoltaic protective glass in order to absorb the highest possible amount of ultraviolet light from the incident solar spectrum. Spray coating deposition technology with various types of ink compositions was used for process optimization. It was observed that there are optimal concentrations and solvent types for the best conversion effect and consequently, the improvement of solar cell external quantum efficiency (EQE) together with the PV cell absolute efficiency enhancement.

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