Manipur University is a central university located in Imphal, Manipur, India. It was established on 5 June 1980, under the Manipur University Act, 1980 (Manipur Act 8 of 1980), as a teaching cum-affiliating university with territorial jurisdiction over the state of Manipur. It was converted into a central university under the Manipur University Act, 2005 w.e.f. 13 October 2005.
Establishing a clear connection between defect structure and photocatalytic performance remains challenging, as conventional metrics often fail to predict efficacy. This study employs low-temperature irradiated thermoluminescence (TL) to probe charge carrier dynamics in zinc oxide (ZnO). Three ZnO nanoparticle samples were synthesized: non-annealed (ZnO-NA), single-annealed (ZnO-SA), and double-annealed (ZnO-DA). Despite systematic increases in crystallite size (44.56–115.13 nm) and bandgap, methylene blue degradation followed a nonlinear trend: ZnO-SA (87
The development of efficient photocatalysts for wastewater remediation is often hindered by time-intensive degradation experiments. This study introduces a novel, high-throughput screening protocol using Ice-Temperature Irradiated Thermoluminescence (ITI-TL) to predict the photocatalytic potential of orthorhombic CaSO _4 :Dy nanophosphors synthesized via sol-gel and co-precipitation methods. While traditional X-ray diffraction (XRD) and scanning electron microscopy (SEM) confirmed phase purity and morphological evolution, they fail to quantify the real-time charge carrier dynamics essential for catalysis. Our results demonstrate that ITI-TL provides a direct “window” into these dynamics by measuring initial electron-hole (e-h) pair concentration and thermal stability. The sample synthesized via co-precipitation and annealed at 900 ^∘ C exhibited the highest initial carrier density ( 8.3 × 10^5 counts) and superior thermal retention (50.1 ρ = 0.95 , providing formal statistical validation of the screening framework. This work validates ITI-TL as a transformative diagnostic tool capable of estimating a material’s environmental remediation potential in minutes rather than hours, streamlining the discovery of next-generation persistent phosphors.
Mear Infrared (NIR) persistent luminescent (PersL) materials are critical for in vivo cancer imaging due to their deep tissue penetration and elimination of autofluorescence. However, characterization of these phosphors via thermoluminescence (TL) spectroscopy is severely limited by commercial photomultiplier tube (PMT)-based readers, which exhibit poor NIR quantum effi-ciency, employ signal-attenuating optical filters, and suffer from saturation under high-intensity emissions. This work presents a filter-less TL reader integrating a silicon photomultiplier (SiPM) with 300-1050 nm spectral response and a Zynq Z-7010 system-on-chip (SoC) for real-time control. The system features variable photon integration windows (1 & micro;s to 1 s) and proportional-integral-derivative (PID)-controlled heating (+/- 0.25 degrees C accuracy, 1 degrees C/s-5 degrees C/s). Comparative evaluation against a commercial Nucleonix PMT reader using LiGa5O8:Cr3+ and ZnGa5O8:Cr3+ phosphors demonstrates that the SiPM-based system successfully captures NIR emission peaks at 720 nm-completely missed by the PMT system's IR cut-off filter-with significantly higher TL intensities and superior trap-state resolution. This instrumentation breakthrough enables accurate characterization of NIR PersL materials for next-generation cancer diagnostics.
The NIR (near-infrared) persistent phosphor, LiGa5O8:Cr3+(LGO:Cr), is a suitable candidate for bioimaging applications. Understanding the trap characteristics of the LGO:Cr persistent phosphors could enhance their properties. LGO:Cr can be prepared by two different methods: solid-state reaction and sol–gel. In this work, thermoluminescence (TL) analysis of LGO:Cr prepared by the two methods has been performed, revealing that the mode of preparation and irradiation energy play a vital role in using this phosphor. TL analysis found that, for in vivo imaging, LGO:Cr prepared using solid-state synthesis and irradiated with UV rays is better than the LGO:Cr prepared using sol–gel. However, LGO:Cr prepared using sol–gel is better for dosimetry than LGO:Cr prepared using solid-state synthesis provided it has stable fading and a linear dose response. Computerized glow curve deconvolution (CGCD) was performed using a temperature-dependent frequency factor equation. The results showed that the TL curve of LGO:Cr can be described using 13 TL peaks. The activation energy of the trap ranges from 0.6 eV to 1.44 eV, the fraction of empty traps that take part in the retrapping process is about 0.001–0.216, the temperature-dependent frequency factor ranges from 36,000 to 39,300 s−1 °K−2, and the capture cross-section varies from 2.157 /z .10^-17 to 8.789/z. 10^-18 , where z is the ratio of effective mass to the remaining mass of the electron.
A comprehensive data of whole‐rock and stable isotopic geochemistry along with microfossil assemblages of the carbonate rocks of the ophiolite mélange zone of the Indo–Myanmar orogenic Belt (IMOB), north‐east India are discussed, to determine the influence of terrigenous contamination during the formation of these carbonate rocks and also to understand their depositional environment and ages. These carbonate rocks contain a diverse fauna with the dominance of foraminiferal assemblages of planktonic foraminifera (Globotruncana sp. and Heterohelix sp., etc.) which indicates they were formed during the Santonian to Maastrichtian age. Based on chemical compositions, these carbonate rocks have been identified as limestone (CaO/MgO > 50.1) to slightly dolomitic limestone (9.1 < CaO/MgO < 50.1). Total rare earth element (REE) contents in these carbonates are variable (22.39–146.05 ppm). The Post‐Archean Australian Shale (PAAS)‐normalized REE + Y patterns of these carbonates exhibit seawater‐like REE patterns with LREE depletion and relative HREE enrichment with negative Ce anomalies (Ce/Ce* = 0.32–0.79) and positive Y (4.42–27.81 ppm) and Eu anomalies (Eu/Eu* = 1.11–1.86), suggesting that they were deposited under an oxygenated environment with contamination by hydrothermal activity. They are also depleted in δ13C 0/00 (PDB) (1.02–1.570/00) and δ18O 0/00 (PDB) (−6.37 to −9.00%) values which characterize marine precipitates. Eu anomalies and spread in negative δ18O 0/00 (PDB) values to a lesser extent of δ13C 0/00 (PDB) values of these carbonates suggest their formation was altered by diagenesis in the shallow marine environment. Our new whole‐rock and stable isotope geochemical characteristics, in conjunction with microfacies, suggest that the investigated carbonate rocks might have been formed in low‐energy environments, and deposited in neritic to bathyal palaeoenvironments during the Santonian to Maastrichtian interval.
