The current study focuses on the production of GdAl
(BO
)
(GAB) phosphors using gel combustion. X-ray diffraction (XRD) and thermoluminescent (TL) methods were used to investigate the structural and ...thermoluminescence (TL) features of the samples. XRD results revealed that GAB phosphors were crystallized in a rhombohedral crystal system. TL experimental data exhibited an unusual heating rate behaviour, which was explained by the semi-localized transition model, and this provides valuable insight into the properties of the GAB sample. Beta-irradiated GAB hosts exhibit two primary peaks at 106 °C and 277 °C on their TL glow curves. We have employed a variety of heating rates (VHRs), T
-T
method, and computerized glow curve deconvolution (CGCD) techniques. By using a combination of these techniques, we can identify the kinetic parameters of the GAB samples more accurately, including peak numbers, activation energy, and frequency factors. Both T
-T
and CGCD techniques produce similar results in terms of trap numbers and trap depths. In the trap centers, electrons were trapped at 1.05 eV, 0.84 eV, 1.12 eV, 1.20 eV, 1.42 eV, 1.63 eV and 1.42 eV. There was a linear behaviour of GAB samples over a dose range of 0.1 Gy-10 Gy. GAB phosphors did not show any significant changes in TL response with repeated irradiation cycles, suggesting that it is a reliable radiation dosimeter. GAB is therefore a potential candidate for radiotherapy dose measurement based on these findings.
This study reports cathodoluminescence (CL) and photoluminescence (PL) properties of undoped borate Ca
Y
B
O
and Ca
Y
B
O
:x Dy
(x = 0.5, 1, 2, 3, 5, and 7) synthesized by gel combustion method. ...Micro-X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), CL and PL under electron beam and 359 nm pulse laser excitation, respectively were used to investigate characterization and luminescence studies of synthesized samples in the visible wavelength. As-prepared samples match the standard Ca
Y
BO
phase that belongs to the orthorhombic system with space group Pnma (62) based on XRD results. Under electron beam excitation, this borate host shows a broad band emission from about 250 to 450 nm, peaked at 370 nm which is attributed to NBHOC. All as-prepared phosphors exhibited the characteristic PL and CL emissions of Dy
ions corresponding to
F
→
H
transitions when excited with laser at 359 nm. The CL emission spectra of phosphors were identical to those of the PL spectra. Concentration quenching occurred when the doping concentration was 1 mol% in both the CL and PL spectra. The underlying reason for the concentration quenching phenomena observed in the discrete orange-yellow emission peaked at 574 nm of Dy
ion-doped Ca
Y
B
O
phosphor is also discussed. According to these data, we can infer that this new borate can be used as a yellow emitting phosphor in solid-state illumination.
Copper iodide is an attractive p-type transparent material suitable for optoelectronic applications. This work reports on the synthesis of copper iodide (CuI) by iodination of sputtered Cu films ...previously deposited on glass and silicon substrates. The crystalline phase and surface morphology were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The prepared CuI films crystallize in the zinc blende structure (γ-phase) at different amounts of iodine and exhibit preferential orientation along the direction. Moreover, detailed investigation of the microstructure via high-resolution transmission electron microscopy (HR-TEM) revealed the presence and details of alternating twin crystallographic domains between adjacent grains. The electrical properties of the CuI films were characterized by Hall effect measurements and revealed a p-type carrier behavior for all films. The electrical behavior was discussed and attributed to the change in intrinsic point defects. In addition, the electronic bandgap and luminescence properties were investigated using optical transmission and photoluminescence (PL). The CuI films showed a wide band gap (about 3.05 eV) with an average transmittance of about (66 %) in the visible region. Moreover, the PL showed a blue emission ranging from 400 to 440 nm originating from the excitonic recombination and radiative point defects.
Dementia is a debilitating neurological condition that is characterized by persistent cognitive decline. It is a global health challenge, with a rapidly increasing prevalence due to an increasing ...aging population. Although definitive diagnosis of various conditions of dementia is only possible by autopsy, clinical diagnosis can be performed by a specialist. The diagnostic process has evolved with recent breakthroughs in diagnostic tools, such as advanced imaging techniques and biomarkers. These tools facilitate early and accurate identification of the condition. Early diagnosis is vital, as it enables timely interventions to improve the quality of life for affected individuals. Treatment strategies for dementia encompass both pharmacological and non-pharmacological approaches. Non-pharmacological treatments include cognitive training and lifestyle modifications. Among pharmacological treatments, acetyl-cholinesterase inhibitors including donepezil, rivastigmine, and galantamine can be used in various doses based on the severity of the disease. Apart from these, N-methyl-D-aspartate receptor antagonists such as memantine can also be used. Furthermore, personalized treatments have also gained significant attention in dementia treatment. Interdisciplinary care, involving healthcare professionals, social workers, and support networks, is crucial for comprehensive and holistic dementia management.
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