Luminescence最新文献

The fabrication of the green strategy of metallic oxide creation provides considerable profits via a minimum of effort, making it an acceptable substitute to the most laborious and challenging conventional processes. The suggested approach involved the creation of titanium dioxide (TiO₂) nanoparticles through Orthosiphon stamineus extracts of leaves. The synthesized nanoparticles (NPs) were then characterized using XRD, FT-IR, FE-SEM with EDX, and UV–visible spectroscopy. UV–visible spectroscopy validated the presence of optical imperfections in the TiO₂ NPs at frequencies of 286 nm. This research specifically focused on examining the photodecomposition and germicidal traits of NPs. Initiatives aimed must be made to mitigate the hazardous effects of TiO₂ NPs in an ecologically sensitive way throughout their production. Exposing the dye methylene blue (MB), a major water polluting produced by garment manufacturing, to TiO₂ NPs resulted in a considerable increase in photodecomposition efficiency. The photodecomposition process exhibited a rate of breakdown of 83%. The findings indicate that the diameter inhibition zone exhibits the most potent resistance versus pathogenic microorganisms. These results have led to the identification of a long-term, sustainable, and ecologically beneficial solution for removing pollutants from water and biological properties.

The fluorescent materials have sparked a lot of research interests due to their unique electronic, optical and chemical characteristics. Here, we are intended to present a simple and facile synthesis of novel orange emitting thiazole-pyridone fluorescent tag (TPFT) by a simple diazo coupling reaction and the structural elucidation was carried out by IR, NMR (¹H and ¹³C), UV–Vis, photoluminescence and HR-MS spectrometry. The solvatochromic behaviour of the TPFT offered crucial information about the formation of hydrazone and azo tautomeric forms. The DFT simulations are computed to calculate HOMO-LUMO energy gap (3.028 eV) of TPFT along with MEP and RDG analyses. Comprehensive LFP visualization is revealed under both normal and UV light conditions (365 nm). The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to analyse the electrochemical behaviour of the TPFT-modified glassy carbon electrode (MGCE) and exhibited a lower detection limit of 7.89 × 10⁻⁸ M (S/N = 3) with a linear range of 0.5–8.0 μM for DA detection. The live-cell imaging study of TPFT showed a strong blue emission at 453 nm, which generally indicates the existence of fluorescence stability.

In this work, the luminescence properties of AgInS₂ colloid nanoparticles in solution and in films were investigated and compared. Decay time of fast and slow relaxation processes differ by about an order of magnitude. Both components are significantly reduced in films compared to the corresponding contributions in colloids that hint towards charge carrier transfer between AgInS₂ particles enhanced in the films.

The current work was going to study the dosimetric properties of Egyptian muscovite minerals irradiated with β-rays using the thermoluminescence technique (TL). The analysis of the TL glow curves was done using the (T_m − T_stop) and the initial rise methods. The deconvolution of the muscovite glow curves was analyzed to have eight superimposed trapping peaks. These trapes were located at 0.72, 0.80, 0.98, 1.09, 1.19, 1.30, 1.50, and 1.59 eV. Muscovite samples were studied at doses up to 330 Gy and exhibited good linearity in relation to beta radiation. The kinetic parameters, sensitivity, and dosimetric characteristics were evaluated. High accuracy was achieved through the repeatability of TL measurements.

Latent fingerprint imaging is a crucial tool for national security and crime recognition, requiring environmentally sustainable, nontoxic materials. To address this need, we have developed a green fluorescence-emitting material, THCHO, that binds effectively to latent fingerprints, enabling clear, high-resolution visualization. The solution produces strong green fluorescence that highlights fingerprint imprints with exceptional detail and contrast. The material is applicable across various substrates, making it efficient for on-site visualization. The synthesized organic conjugated material THCHO rapidly visualizes precise fingerprint substructures within 5 s using a simple spray method. It maintains high contrast and low interference across different substrates, such as glass, aluminum foil, plastic, and ironware, even in diverse backgrounds. Additionally, the THCHO material demonstrates high stability, retaining its fluorescence imaging capabilities for up to 35 days and after water washing. This is the first report of using a conjugated organic thiophene material for latent fingerprint fluorescence imaging, suggesting potential applications in other fields.

A new calix[4]triazacrown-5–derived fluorescence chemosensor (AntUr-AzClx) at cone conformation was synthesized to afford an effective fluorescent probe, which enables an enhancement in the fluorescence intensity specifically in the presence of Co²⁺ metal ions as well as a turnoff response for hazardous dichromate anions. ¹H-NMR, ¹³C-NMR, ESI-MS, and elemental analysis techniques were used to characterize the structure of the anthracene-appended calix[4]triazacrown-5 (AntUr-AzClx). The metal ion–binding ability of AntUr-AzClx was evaluated against Co²⁺, Ba²⁺, Ni²⁺, Pb²⁺, and Zn²⁺ ions. On the basis of various metal ion recognition phenomena, AntUr-AzClx exhibited outstanding selectivity for only the Co²⁺ ion among other metal ions. Also, the calix[4]triazacrown-5–derived fluorescence chemosensor showed high sensitivity towards the Co²⁺ ion with a very low limit of detection (LOD) 0.142 μmol L⁻¹. In addition, anion binding abilities of AntUr-AzClx against various anions such Cr₂O₇²⁻, HCO₃⁻, CO₃²⁻, NO₃⁻, SO₃²⁻, SO₄²⁻, N₃⁻, F⁻, and I⁻ demonstrated that AntUr-AzClx enables selective and highly sensitive detection of the Cr₂O₇²⁻ anion with an excellent LOD of 4.182 nmol L⁻¹ in DMF/PBS (1/1, v/v; pH: 7.05). Furthermore, the calix[4]triazacrown-5–derived fluorescence chemosensor displayed a significant sensing behavior to detect the presence of dichromate anions even in real samples.

In this study, the application of continuous wavelet transform as a signal processing technique for the spectrofluorimetric determination of rosuvastatin and losartan is investigated. Both rosuvastatin and losartan exhibited native spectrofluorometric signals with severe overlapping peaks, making their simultaneous determination challenging. To address this issue, rbio 2.4 wavelet transformation was employed to obtain zero-crossing points in the synchronous fluorescence spectra of losartan and rosuvastatin at 346 and 408 nm, respectively, making their quantification possible. The developed method was validated according to the ICH guidelines and displayed high accuracy, precision, and specificity. The method exhibited excellent linearity over concentration ranges 0.2–2.0 and 0.25–2.0 μg/mL for losartan and rosuvastatin, respectively. In addition, LOD and LOQ were 0.046 and 0.140 μg/mL for losartan and 0.036 and 0.110 μg/mL for rosuvastatin, respectively, indicating the high sensitivity of the developed method. Moreover, greenness and blueness assessments were carried, revealing a high AGREE score of 0.71 and BAGI score of 77.5 for the developed method, making it a promising greener alternative for the reported chromatographic methods. Finally, the developed method was applied to the determination of rosuvastatin and losartan in pharmaceutical formulations, posing it as a powerful greener alternative in quality control laboratories.

A fluoride material phosphor doped with rare earth ions Eu³⁺ and Dy³⁺ was studied for its photoluminescence (PL) properties. The material was synthesized using a combustion method and characterized using X-ray diffraction (XRD) and PL techniques. The Na₃Ca₂(SO₄)₃F: Eu³⁺ phosphor exhibits two distinct peaks at 593 nm (orange) and 615 nm (red) at an excitation wavelength of 395 nm. The PL excitation spectrum of the Na₃Ca₂(SO₄)₃F: Dy³⁺ phosphor showed series of peaks, corresponding to the 4f → 4f transitions of Dy³⁺ ions. Under 350-nm excitation, the PL emission spectrum revealed two prominent bands one at 483 nm (blue region) due to the ⁴F₉_/₂ → ⁶H₁₅_/₂ transition, and another at 573 nm (yellow region) resulting from the ⁴F₉_/₂ → ⁶H₁₃_/₂ transition. These blue and yellow emissions suggest potential applications in solid-state lighting, particularly for mercury-free excitation sources. Rare earth–doped Eu³⁺/Dy³⁺ materials exhibit highly efficient PL properties, making them suitable candidates for white light-emitting diodes (LEDs) or other solid-state lighting phosphors.