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Lanthanide-activated alkaline earth aluminate phosphors are excellent luminescent materials that are designed to overcome the limitations of conventional sulfide-based phosphors. The increasing research attention on these phosphors over the past decade has led to a drastic improvement in their phosphorescence efficiencies and resulted in a wide var...
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... In the limited environment that surrounds the lanthanide activator, a luminescence center appears to be a significant factor in sustained luminescence. Since even little changes in the conditions surrounding phosphor synthesis can result in significant alterations in their luminescence qualities, it is important to understand how phosphor synthesis procedures and compositions affect persistent luminescence [5]. ...
In this work, CaS phosphors were synthesized using the sol–gel method with doping of rare earth metals such as Eu, Dy, and Tm in combination. The optimization of the dopant concentration at 2% allowed for the adjustment of the samples’ characteristics. Detailed analyses were carried out, including X-ray diffraction studies, evaluation of photoluminescence characteristics, examination of hemocompatibility, and determination of the average lifetime of the excited state for this novel set of CaS phosphors. The synthesized phosphors displayed intense greenish-yellow emissions at a wavelength of 543 nm, which can be attributed to the electric dipole transition resulting from the dopants. Among the different compositions, the CaS phosphors doped with 2% Eu and 2% Dy showed exceptional structural and morphological qualities. Additionally, this composition exhibited the highest hemolysis inhibition percentage, with 82.37% of red blood cells remaining viable. Moreover, this particular sample demonstrated the maximum light efficacy in terms of radiation and excitation purity. The study emphasizes the luminescent properties and biocompatibility of the CaS phosphor, particularly when enhanced through doping. The findings suggest promising potential for the application of these phosphors in the field of bioimaging.
... 1 Aluminate materials doped with rare earth have gained significant attention in research for their excellent LPL properties. 2,3 The SrAl 2 O 4 :Eu 2+ , Dy 3+ phosphor is one of the most efficient LPL materials. [4][5][6] These crystals have excellent luminescence properties such as high initial brightness, long-lasting time, or visible green emission, which make them profoundly useful in various fields such as optical data storage, safety indication, bioimaging, pressure sensing, and new energy. ...
In the SrO‐Al2O3‐B2O3‐SiO2 glass system, a SrAl2O4:Eu²⁺, Dy³⁺ long‐persistent luminescence glass‐ceramic (SAGC) with Li2O was successfully synthesized for the first time using the recrystallization‐melting method. The composition, micromorphology, long‐persistent luminescence (LPL) properties, photoluminescence (PL) properties, and water resistance were measured by X‐ray diffractometer, scanning electron microscope, brightness meter, fluorescence spectrophotometer, and pH meter, respectively. The method involves the formation of grains below the glass transition temperature, followed by the formation of the glass phase at a higher temperature, and finally the formation of products through cooling. The samples exhibited green PL and LPL emissions and demonstrated excellent color purity, homogeneity, and LPL luminescence. After doping Li2O, the purity and crystallinity of the SrAl2O4 were improved, and scalene hexagonal or monoclinic prismatic SrAl2O4 crystals with high regularity were synthesized in the glass matrix. This research indicates that excellent LPL benefits from the complete crystal structure, abundant crystals, and large crystal size. When the Li2O content reached 5 mol%, the crystal size was ∼30 µm, the PL and LPL properties performed best, and greater water resistance was exhibited. The SAGC in this new glass system has potential in optical storage.
... [1][2][3][4][5] Typical LPL materials include sulfides, aluminate, and silicate, such as ZnS:Cu, SrAl 2 O 4 : Eu 2þ /Dy 3þ , and CaAl 2 O 4 :Eu 2þ /Dy 3þ . [6][7][8][9] However, these LPL materials are sintered powders featured with the high synthesis temperature (>1000 C) and severe scattering effect. Moreover, some advanced applications, such as volumetric display or three-dimensional information storage, stimulate the study of developing efficient LPL materials with high transparency and long afterglow duration. ...
Exploring efficient and stable long-persistent luminescence (LPL) materials is of great value for promoting their advanced applications. Here, the metal halide CsCdCl3:Mn2+ crystals with tunable afterglow properties and good stability were grown by a facile solution method. Upon ultraviolet excitation, CsCdCl3:Mn2+ crystals exhibited a bright orange emission at 590 nm from the d–d transition of Mn2+ ions. Mn2+ doping concentrations matter for the LPL performance. By optimizing the doping amount of Mn2+, an enhanced afterglow duration up to 12 000 s was achieved, compared with undoped sample, originating from a trap redistribution. The deep traps in CsCdCl3:0.1Mn2+ crystal that provide little contribution to the LPL at room temperature shifted to shallow levels, thus synergistically enhancing the afterglow intensity and duration. Based on the variable afterglow durations by tuning Mn2+ doping concentrations, a multi-dimensional information storage encryption model was designed. This work gives deep understanding in doping effect on the afterglow and provides examples for the development of multi-dimensional information encryption.
... Supercapacitors, as an energy storage solution, can be conveniently classified into three primary categories: electrical double-layer capacitors (EDLCs), redox capacitors, and Materials 2023, 16 pseudocapacitors. Among these, EDLCs operate on a distinct energy storage principle based on the formation of a dual layer of ions in close proximity to the electrode surfaces, a phenomenon commonly referred to as the Helmholtz electrical double layer. ...
... On the other hand, lanthanide (Ln) elements have been extensively investigated across various application domains, including the display industry, magnets, bio-industry, pyroprocessing technology in nuclear power plants, and energy/environment fields [7][8][9][10][11][12][13][14][15][16]. Indeed, these elements exhibit unique physicochemical properties due to their unpaired 4f electronic configurations. ...
Supercapacitors have attracted considerable attention due to their advantages, including being lightweight and having rapid charge–discharge, a good rate capability, and high cyclic stability. Electrodes are one of the most important factors influencing the performance of supercapacitors. Herein, a three-dimensional network of rough and porous micropebbles of CeCu2Si2 has been prepared using a one-step procedure and tested for the first time as a supercapacitor electrode. The synthesized material was extensively characterized in a three-electrode configuration using different electrochemical techniques, such as cyclic voltammetry (CV), galvanostatic charge and discharge (GCD) tests, and electrochemical impedance spectroscopy (EIS). CeCu2Si2 shows rather high mass-capacitance values: 278 F/g at 1 A/g and 295 F/g at 10 mV/s. Moreover, the material exhibits remarkable long-term stability: 98% of the initial capacitance was retained after 20,000 cycles at 10 A/g and the Coulombic efficiency remains equal to 100% at the end of the cycles.
... They have good thermal stability and long service life [10]. In the literature survey, we found the Aluminate host material considered a luminescence center due to its excellent chemical and thermal stability [11][12][13]. In the present work, the photoluminescence property of KAlSiO4:Eu 3+ and KAlSiO4:Tb 3+ phosphors were studied. ...
KAlSiO 4 :Eu ³⁺ , Tb ³⁺ phosphor synthesized first time by simple combustion method. The X-ray diffraction (XRD) study confirms that the KAlSiO 4 phosphor matrix successfully matches to standard JCPDS database file. Photoluminescence properties observed for rare earth Eu ³⁺ , Tb ³⁺ at various concentration (x = 0.3, 0.5, 1.0, 1.3 mole %) shows an optimistic luminescence property. KAlSiO 4 matrix shows unique emissions of Eu ²⁺ and Eu ³⁺ ions when excited by 395 nm, where the utmost emission intensity was received when x = 1.0 mole%. The excitation spectra of KAlSiO 4 :Eu ³⁺ give proper peak position at 262 nm, 395 nm, and 465 nm corresponding to O ²⁺ → Eu ³⁺ , ⁷ F 0 → ⁵ L 6 , ⁷ F 0 → ⁵ D 2 . While sharp emissions peaked at 593 nm and 613 nm are obtained by ⁷ F 0 → ⁵ D 1 and ⁷ F 0 → ⁵ D 2 transitions. On the other hand, KAlSiO 4 :Tb ³⁺ shows the excitation peak position at 352 nm,370 nm, and 378 nm which gives the sharp green emission peak at 545 nm due to the ⁵ D 4 → ⁵ F 5 transitions. The particle size and elemental constitution determine using SEM-EDX analysis which is in the range of micrometers in size. The band gap and refractive index are determined using UV-visible spectroscopy. CIE chromaticity coordinate shows multicolor emission for KAlSiO 4 :Eu ³⁺ while the green color emission for the KAlSiO 4 :Tb ³⁺ phosphor. Photoluminescence (Pl) spectroscopy reveals the exciting luminescent properties of the KAlSiO4:Eu ³⁺ , Tb ³⁺ phosphor which may be applicable potential phosphor for fabrication of various light emitting devices.
... Now, the resultant solution is finally centrifuged in a centrifugal machine at 1500 rpm for half hour (Fig. 3). This step separates ZnS:Cu from other impurities (Kerekes et al., 2020;Kim, 2021;Kimi et al., 2015) Which is done by removing the excessive solution after centrifuging for 30 min. This step is repeated for 10 times to ensure complete removal of impurities resulting in a pure sample of ZnS:Cu. ...
ZnS:Cu is a mechanoluminescence sensor whose behavior is very different as compared to any other conventional sensor. As it does not require power, the biggest advantage of this smart sensor is that, unlike other sensors which react to changes in dimension in any 1 or 2 directions at max as well as requires sophisticated sets of instrumentation for making use of the obtained data. However, the ZnS:Cu mechanoluminescence sensor does not require any complex instrumentation and it can determine the distribution of stress on the surface on any structural element by glowing in places of stress concentration. In this paper, the wet chemical method of synthesis is opted for synthesizing the ZnS:Cu mechanoluminescence sensor with the purpose of surface stress visualization on the surface of a standard 150 mm cube (Alex C., Meeruty, A., Patel, M.N., Nihalani, S. 2020 “Comparative analysis of mechanolumines- cencematerial (ZnS:Mn) and strain gauge sensor,” AIP Conference Proceedings 2281; Anesh M.P, Gulrez, S. K. H., Anis, A., Shaikh, H., Ali Mohsin, M. E. and AL-Zahrani, S. M., 2014 “Developments in Eu+2-Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite,” Advances in Polymer Technology, vol. 33; Bite et al. Dec. Materials & Design 160:794–802, 2018; Chandra et al. Jan. Sensors and Actuators a: Physical 173:9–16, 2012).
... Claubau et al. in his model prepared from photoconductivity measurements of SrAl2O4: Eu 2+ , Dy 3+ under UV excitation observed that there is an increase of photoconductivity up to 250K and it goes as high as 300K where it plateau, this indicates that no free charge carriers are discharged at this temperature. [31] The presence of the detrapping process is observed with thermoluminescence studies around this temperature. They additionally advised that there may be no interplay among the traps and the luminescent center through the conduction band. ...
Various types of sensors are used for structural health monitoring systems, some of these systems are strain sensors, vibration sensors, etc. which are based on the resistance of material whose change can be recorded via a microcontroller and plotted to understand the real-time behavior of a structure and the effects of various loads acting on it. But these sensors require expensive equipment and skilled personnel, external power, as well as the acquired data needs to be processed such that some sense can be made out of it. Thus, a new method of Structural Health Monitoring using Mechanoluminescence materials that don't require external power seems quite promising, but being in the initial stage of research and development it comes with its own set of challenges. This study tries to understand the synthesis methods available to synthesize Strontium-based Mechanoluminescence sensors, their working, the embedment processes, and their performance when subjected to loading.
... Moreover, CuO is quite abundant in nature and wide range of information is available in literature too [33]. Meanwhile, Barium aluminates have been doped with lanthanides most commonly reported so far [34]. Different percentage of copper doping has been reported in this work for elucidating comparative behavior of synthesized materials. ...
Elimination of toxic dyes, as one of the utmost usual industrial pollution released in the natural water, is the very serious issue for the modern civilization. In this study a novel bimetallic [email protected] zeolitic imidazolate frameworks (ZIFs) have been fabricated by a simple and straight forward room temperature technique. Sodalite (SOD) cage type structure, morphology and porosity of synthesized bimetallic MOFs were characterized by SEM, TEM, XRD and BET. The results of characterizations showed that the [email protected] owns greater nano crystallinity, surface area and porosity. As compared to single metallic MOFs (ZIF-67 and ZIF-8), the physical and chemical properties of [email protected] were improved. Accordingly, the [email protected] potentially analysed for the exclusion of rhodamine B from water and the gained outcomes were compared with the efficiency of mono-metallic MOFs (ZIF-67 and ZIF-8). Several parameters, including initial dye concentrations, sonication time, and pH on dye removal efficiency were investigated. Additionally, Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich isotherm models were used to explain the process of adsorption onto the surface of MOFs. The results disclosed that the Langmuir model sufficiently explained the adsorption procedure as monolayer with higher R² values (R² = 0.9924, 0.9822 and 0.9909 of ZIF-67, ZIF-8 and [email protected] respectively). The mean free energy (E) was observed to be 0.551, 0.576 and 0.532 KJ.mol⁻¹ for ZIF-67, ZIF-8 and [email protected], respectively, exposing that the chemisorption dominates the process of adsorption. The qmax premeditated with Langmuir model was comparatively high (143.26 mg.g⁻¹) as that to ZIF-8 (56.40 mg.g⁻¹) and ZIF-67 (81.63 mg.g⁻¹), accrediting to the intensification in active binding sites. Also, the reusability of bimetallic MOFs was tested up to four regeneration cycles and results were outstanding with only 8 ±1% decrease in efficiency. It is assumed that, the fabricated [email protected] composite have high applicability for the adsorption of toxic dyes from water.
... Examples include BaB 4 O 7 :Dy [5], LiSr 4 (BO 3 ) 3 : Ce 3+ [6], LiBa 2 B 5 O 10 :Re 3+ (RE = Dy, Tb, Tm) [7], Li 2 B 4 O 7 :Cu [8], CaB 4 O 7 :Dy 3+ [9], LiSrBO 3 :Dy 3+ , Tm 3+ , Eu 3+ [10], SrB 4 O 7 :Ho 3+ [11]. Moreover, Kim (2021) reviewed current progress in lanthanide-activated alkaline earth aluminate phosphors suggesting a wide range of potential applications [12]. Aluminium borate, among the other borates, has recently indicated some significant characteristics, including TL sensitivity and linear dose response. ...
The structural and thermoluminescence characteristics of samarium doped Ca3Y2B4O12 samples at various concentrations are presented. The samples were synthesized via the combustion method. The thermoluminescence (TL) glow curves for Ca3Y2B4O12:Sm³⁺ depict strong peaks at 97 and 410 °C. Ca3Y2B4O12:Sm³⁺ exhibited completely opposite behavior, contrary to expectations, in that the luminescence intensity of both the total and individual glow peaks increased with the heating rate throughout the TL experiments. This unusual TL glow peak pattern was discussed via the Mandowski model of semi-localized transitions. The kinetic characteristics of both prominent glow peaks were established using various analysis techniques, including variable heating rate, initial rise (IR) by using the TM-Tstop method and the fractional glow technique (FGT), and computerized glow curve deconvolution (GCD). The dose response of the high temperature peak at 410 °C is linear between 0.1 and 5 Gy, and then sublinear at higher doses. In addition, the repeatability and fading results of 410 °C TL peak also yielded very favorable results. These findings suggest that Ca3Y2B4O12:Sm³⁺ has great potential in the development of high temperature dosimetric materials for beta irradiation.
... Moreover, CuO is quite abundant in nature and wide range of information is available in literature too [33]. Meanwhile, Barium aluminates have been doped with lanthanides most commonly reported so far [34]. Different percentage of copper doping has been reported in this work for elucidating comparative behavior of synthesized materials. ...
The entire world is facing an alarming situation due to energy demands and environmental pollutions. Solid oxide fuel cells are attractive in the era of renewable energy. Developing the materials for anode in solid oxide fuel cell is a challenging task to overcome the losses. Novel nanocomposites materials Ba0.75Al0.20Cu0.05O3, Ba0.75Al0.15Cu0.10O3, Ba0.75Al0.10Cu0.15O3 were synthesized by sol-gel method. Structural and morphological properties were carried out using X-rays diffractions and scanning electron microscopy. The prepared materials show porous structure as confirmed by Scanning electron microscopic images, while the average crystallite size of 34 nm has been determined by XRD. Furthermore, thermal stability was checked by thermo-gravimetric analysis using the temperature up to 800°C. Among all the nanocomposites, Ba0.75Al0.15Cu0.10O3 has maximum conductivity of 5.25 Scm⁻¹ at 650°C with power density of 483 mWcm⁻². The ionic and electronic conduction play some key role in fuel- electricity conversion. Moreover, the photocatalytic degradation of Rhodamine B has also been studied using visible light source. Different percentage of copper doping has been reported in this work for elucidating comparative behavior of synthesized materials. To the best of our knowledge, copper doping hasn't been done in barium aluminates to explore fuel cell applications along with photocatalytic vitiation of organic dyes as pollutants. All the three prepared materials show good results in percentage degradation efficiency as Ba0.75Al0.20Cu0.05O3 showed 86.2 %, Ba0.75Al0.15Cu0.10O3 69.8% and Ba0.75Al0.10Cu0.15O3 with 63.77 % respectively.
