The glass containing the following compositions: Te2O3- B2O3- Li2CO3- ZnO- NaF: Sm2O3 were made using the melt-quench process and identified as Sm3+ Tellurite glass. The present work shows their Physical, optical, luminescent, and radiative characteristics in this paper. The glass's amorphous form was confirmed by an analysis of powder X-ray diffraction. Fourier transform infrared spectroscopy was used to identify the functional groups of glass. The glass was inspected using ultraviolet-visible spectroscopy and JO analysis was discussed. Its refractive index and optical band gap were among these characteristics. Emission peaks at 565 nm, 600 nm, and 646 nm were seen in the emission spectra. Based on the Commission International de l'eclairage (CIE 1931) diagram, all samples' color coordinates showed outstanding emission between neutral white and sunshine white, suitable for yellow laser. Using the Phy-X program, the mass attenuation coefficient, half-value layer, mean free path, tenth value layer, and energy absorption buildup factor (EABF) were examined about the glass's gamma ray shielding properties.

This study aims to investigate the structural, optical, and mechanical properties of Ce3+ doped Barium Tin Borophosphate glass for potential applications in nuclear radiation shielding. The Ce3+ Doped Barium Tin Borophosphate glass (50B2O3+20 P2O5+10TiO2+6SrCO3+4SnO+ 4BaF2+5BaCO3+1Ce2O3) was produced according to earlier research, melt quenching method. The amorphous nature of Ce3+ Doped Barium Tin Borophosphate glass was verified by powder X-ray diffraction investigation. The Ce3+ Doped Barium Tin Borophosphate glass's functional groups were determined using Fourier transform-RAMAN and Fourier transform infrared spectroscopy. Using Ultraviolet-Visible spectroscopy the Ce3+ Doped Barium Tin Borophosphate glass was examined. These properties included its optical band gap, extinction coefficient, optical conductivity, and refractive index. Using EDAX and SEM analyses, the chemical compositions and surface morphology of the Ce3+ Doped Barium Tin Borophosphate glass were examined. Ce3+ doped barium tin Borophosphate glass was studied in terms of its excitation and emission spectra using the photoluminescence technique. The glass's CIE coordinates were also looked at. Additionally, the mass attenuation coefficient, half-value layer, mean free path, tenth value layer, and EABF were studied concerning the glass's gamma-ray shielding qualities using the Phy-X software.

The Nb3+ doped Zinc Borophosphate glass (30B(2)O(3) +35P(2)O(5)+5TiO(2)+10ZnO+9LiCO(3)+10 BaCO3+1NbO(2)) has been synthesized successfully using melt-quenching method. The powder X-ray diffraction (XRD) analysis was used to find the glass nature of Nb3+ doped Zinc Borophosphate glass. The functional group of Nb3+ doped Zinc Borophosphate glass was recognized using Fourier-transform infrared spectroscopy (FTIR) analyses. Linear optical properties of the Nb3+ doped Zinc Borophosphate glass were studied using UV-vis-NIR spectrum in the room temperature. Mechanical behaviour of Nb3+ doped Zinc Borophosphate glass was examined through Vicker's hardness method. The mechanical properties of Nb3+ doped Zinc Borophosphate glass was examined with various loads. The emission transitions of Nb3+ doped Zinc Borophosphate glass was studied using Photoluminescence analysis. The CIE diagram of the Photoluminescence was examined. Gamma ray shielding parameters such half value layer, mean free path and mass attenuation coefficient of Nb3+ doped Zinc Borophosphate glass were studied using Phy-X software.

Dy3+ doped B2O3-P2O5-Ta2O5-Li2CO3- Al2O3-NaF-Dy2O3 (BPTLAND) glass was prepared using the melt-quenching method. The Dy3+ doped BPTLAND glass amorphous form was confirmed by an analysis of powder X-ray diffraction. Using EDAX and SEM analyses, the chemical compositions and surface morphology of the prepared glass were examined. FTIR and Raman analysis identified the presence of borate and phosphate groups. Absorption spectroscopy examined the glass’s optical characteristics, with a refractive index of 1.4 at 2 eV and an optical band gap found to be an indirect band gap. The band gap is determined by the intercept of the tangent to the x-axis, which is 2.80 eV. Photoluminescence research revealed dominating emission peaks at 573 nm wavelength. The CIE chromaticity coordinates of the prepared glass were found to exhibit daylight, are x = 0.3647, y = 0.4762, and the Correlated color temperature was found to be 4823 K. The produced glass’s ferromagnetic characteristics were confirmed using VSM analysis to evaluate the hysteresis loop’s retentivity and coercivity of magnetic behavior. Using galvanostatic charge–discharge (GCD), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV), the electrochemical properties of the generated electrodes in a 5 M KOH electrolyte were examined. After 2000 cycles, the glass electrode doped with Dy3+ (BPTLAND) displays the greatest specific capacitance value (258.12 F g−1 for GCD). Scan rate behavior was unique and exhibited redox behavior. In addition, the anodic–cathodic peak difference increases with increasing peak density as the scan rate increases, suggesting that the material is quasi-reversible. The flawless double capacitance characteristic of Dy3+ doped BPTLAND glass was demonstrated by each CV, which showed a regular rectangle. The charge transfer resistance for this electrode was found to be 34.53 (Ω cm2) whereas the ohmic resistance is 14.21 (Ω cm2). The working electrode’s capacity for long cycling performance was consistent CV curve after 5000 cycles indicating the electrode maintains good structural and electrochemical stability over prolonged cycling. The findings therefore confirmed that Dy3+ doped lithium borophosphate BPTLAND glass has a great deal of promise for advancement as electrode materials in the context of LED and supercapacitor applications.

Gadolinium doped phosphate glass was created with a composition of 70 P2O5 + 5Al(2)O(3) + 5 Ba2CO3 + 9 KF2 + 5 MnO2 + 5 SnO+1 Gd2O3 by using the melt-quenching process. The prepared glass sample's amorphous nature was confirmed by the X-ray diffraction analysis. FT-IR examination confirms the presence of phosphate functional groups. Glass's optical band gap was found to be 3.5 eV using Tauc's plot method. The photoluminescence analysis indicates that the emission band at around 311 nm. The Commission International de I'Eclairage (CIE) was employed. It was identified that the computed chromaticity coordinate values (x = 0.3164 and y = 0.3371) were situated in the summer sunlight zone, close to the white light region. The attenuation capabilities of the gadolinium-doped phosphate glass sample were validated by the gamma ray shielding parameters. The mass attenuation coefficient and Mean free path of the prepared glass were fund to be 4.41 x 10(5) cm(2)/g at 0.015 MeV and 12.4 cm at 15 MeV respectively. In terms of infiltration deepness up to 40 MFP, the energy-related energy buildup factor (EBF) and energy absorption buildup factor (EABF) of glasses were calculated using the five (a, b, c, d, and Xk) parameters of the G-P fitting scheme. All of the results show that the synthetic glass can be used as shielding materials against gamma radiation.

An organic mono methyl urea oxalic acid was synthesized and a single crystal was grown by a slow evaporation method using methanol as a solvent. Single crystal and high-resolution X-ray diffraction analyses examined the unit cell parameters and perfection of the grown crystals. The UV cut-off wavelength of the grown crystal and its optical behavior was studied using UV–Vis-NIR spectroscopic analysis. The functional groups of the NMUO crystal were confirmed through the FTIR technique. The elastic constant, yield strength (σy), and growth pattern of the NMUO compound have been studied using an Econment microhardness tester and high-resolution microscope respectively. Thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC) characterized the grown crystals' thermal stability and specific heat capacity. The dielectric behavior of the NMUO single crystal was analyzed for various crystallographic axes. The Laser-induced damage and birefringence of NMUO were experimentally calculated using Nd: YAG laser and halogen lamp as sources respectively. The Photoconductivity of the grown crystal was investigated. The third-order non-linear optical co-efficient of NMUO single crystal was studied using Z-scan Technique.

Abstract The Ce3+ Doped Barium Tin Boro-phosphate glass was produced according to earlier research, melt quenching method. The amorphous nature of Ce3+ Doped Barium Tin Boro-phosphate glass was verified by powder X-ray diffraction investigation. The Ce3+ Doped Barium Tin Boro-phosphate glass's functional groups were determined using Fourier transform-RAMAN and Fourier transform infrared spectroscopy. Using Ultraviolet-Visible spectroscopy, the linear optical properties of the Ce3+ Doped Barium Tin Boro-phosphate glass were examined. These properties included its optical band gap, extinction coefficient, optical conductivity, and refractive index. Using EDAX and SEM analyses, the chemical compositions and surface morphology of the Ce3+ Doped Barium Tin Boro-phosphate glass were examined. Ce3+ doped barium tin Boro-phosphate glass was studied in terms of its excitation and emission spectra using the photoluminescence technique. The glass's CIE coordinates were also looked at. Additionally, the mass attenuation coefficient, half-value layer, mean free path, tenth value layer, and EABF were studied concerning the glass's gamma-ray shielding qualities using the Phy-X software.

Urea Resorcinol (UR) was synthesized and grown using the slow cooling technique to form a possible organic nonlinear optical crystal. Single crystal X-ray diffraction analysis was used to determine the shape and lattice characteristics of the generated UR crystals. The crystallinity was verified using a high-resolution X-ray diffraction examination. The emission and transparency of the formed crystal were revealed by optical studies including photoluminescence and UV-Visible-NIR spectrum analyses. Through the use of an optical microscope and the Vickers microhardness tester, its mechanical behavior was investigated and the density of its etch pits was estimated. The investigations were also conducted on the UR crystal's microphysical properties, including its dielectric tensor, dielectric loss, and thermal analysis. An Nd:YAG laser was used to quantify the laser-induced surface damage and the results were connected to the grown crystal's specific heat capacity. By using the Kurtz and Perry technique, the efficiency of second harmonic generation was determined for different UR crystal particle sizes that have good phase matchability, and its SHG output was compared to urea.

The melt-quench technique was used to produce the rare earth element Sm3+ doped Antimony Boro-Phosphate glass. The amorphous nature of the Sm3+ doped Antimony Boro-Phosphate glass was verified by the powder X-ray diffraction pattern. With the use of FTIR, the functional groups of the Sm3+ doped Antimony Boro-Phosphate glass were determined calculations were made for the optical-bandgap energy and absorption using the Uv–Vis spectroscopic analysis. Among the optical metrics that were calculated and investigated were the refractive index, optical conductivity, and extinction coefficient. Using photoluminescence analysis, the excitation and emission spectra of Sm3+ doped Antimony Boro-Phosphate glass were investigated. The warm white color of the glass that was produced was verified by the chromaticity coordinates. SEM investigation was performed on the produced glass, and the surface morphology of the Sm3+ doped Antimony Boro-Phosphate glass was investigated. Phy-X software was employed to examine the gamma shielding behavior of Sm3+ doped antimony-phosphate glass, including the mass attenuation coefficient, mean free path, half-value layer, and effective atomic number.

Alumino tantalum barium borate - 65B2O3 +10Al2O3 +5SrCO3 +5BaCO3 +14Li2CO3 +4Ta2O5 +1Yb2O3 (AlTaBaBO: Yb) and barium antimony borophosphate - 35P2O5 +35B2O3 +10TiO2 +5 KF +10Li2CO3 +4SbO3 +1CeO3 (BaTiSbBPO: Ce) glasses were prepared using melt - quenching technique. The structural property of asprepared glass materials is investigated by powder X-ray diffraction to identify the amorphous nature of the materials. FTIR and FT-Raman spectroscopic analyses examined various functional groups of glasses. The linear optical behaviours were characterized using UV-visible spectroscopy, and besides the different linear optical parameters such as refractive index and optical bandgap, optical conductivity was estimated. Excitation and emission spectra of the harvested glasses were characterized using a Photoluminescence spectrophotometer. Rare earth - R.E (Yb3+ and Ce3+) doped both glasses have greater emission efficiency due to their 2F7/2 -* 2F5/2 (951 nm) and 5d1 -* 2F5/2, 2F7/2 (550 and 663 nm) electronic transitions, which shows that the as-prepared glass materials have their potential applications. Colour chromaticity (CIE) diagrams of the cultivated glasses were examined with colour co - ordinations x = 0.3054, y = 0.2881 for AlTaBaBO: Yb and x = 0.3874, y = 0.3436 for BaTiSbBPO: Ce and the obtained outcomes confirmed w-LED device fabrication. Moreover, the various gamma- ray shielding parameters were analyzed theoretically using Phy-X software. The five (a, b, c, d, and Xk) parameters of the Geometric Progression (G-P) fitting scheme were used to determine the energy-related energy buildup factor (EBF) as well as energy absorption buildup factor (EABF) of glasses in terms of infiltration deepness up to 40 mfp. At lower photon energy, the AlTaBaBO: Yb and BaTiSbBPO: Ce glasses have the highest mu/rho values of 4.47 x 105 cm2/g and 3.864 x 103 cm2/g, respectively. For AlTaBaBO: Yb and BaTiSbBPO: Ce glasses, the calculated mean free path (MFP) values at 15 MeV photon energy are 0.143 cm and 12.18 cm, respectively. The result of all findings reveals that the synthesised glasses are viable materials for the futuristic utilization of w-LED and neutron radiation shielding applications.

The Tb3+/Dy3+ co-doped Boro-Phosphate Glass (BPANZDyTb) was produced (40 B2O3 + 39P2O5 + 5 Al2O3 + 5 NaF + 10 ZnO + 0.5 Tb2O3 + 0.5 Dy2O3) using melt-quenching technique. X-ray diffraction measurements, Raman, and Fourier Transform Infrared were used to evaluate the structural behavior of the prepared glass. Powder-XRD spectra, in the 10–90° range showed that the prepared glass was amorphous. FTIR analysis reveals that the network contains a variety of structural groups, including B-O-B, BO4, BO, P-O, PO2, P-O-B, and PO4 units. The UV–visible diffuse reflectance spectroscopy was used to record and study the optical linear properties of Tb3+/Dy3+ co-doped Boro-Phosphate Glass (BPANZDyTb). The photoluminescence excitation peak was obtained at 348 nm. The emission peaks were located at 484 nm (4F9/2 → 6H15/2 → blue), 576 nm (4F9/2 → 6H13/2 → yellow), and 662 nm (4F9/2 → 6H11/2 → red). Tb3+ ions are located at 412 nm (5D3 → 7F5), 441 nm (5D3 → 7F4), 546 nm (5D4 → 7F5), and 625 nm (5D4 → 7F3). The result of CIE 1931 chromaticity coordinates indicate that the prepared glass is suitable material for cold white light emitting diode applications due to its color coordinates x = 0.3106 and y = 0.3240 and correlated color temperature (CCT) values about 6768 K. The gamma-ray parameters such as half-value layer (HVL), mass attenuation coefficient (μ/ρ), mean free path (MFP), and effective atomic number (Zeff) of the BPANZDyTb glass were studied using Phy-X software. The results of the gamma-ray parameter show that the Dy3+ ions and Tb3+ ions co-doped BoroPhosphate glass is an appropriate material for radiation shielding applications.

Photocatalysis has a significant role in water remediation. During the process of photocatalysis, catalysts face different problems, such as instability and inefficiency. Here, we are introducing a new method, 'nonlinearity kinetics', which will help to identify this kind of problem during photocatalytic activity. We are considering Ag3PO4@TiO2 to study nonlinear disorder kinetics. Ag3PO4 is a highly photoactive compound with an inherent photocorrossive nature. Here, it addresses the challenge of pure Ag3PO4 by transforming composite materials to Ag3PO4@TiO2 and by studying its nonlinear kinetics during photocatalysis. The Ag3PO4@TiO2 underwent preliminary characterisation. Increment of crystalline nature studied through XRD. FESEM and TEM analysed morphological alignment and diffraction patterns. The functional behaviour of oxygen, Ag, Ti and P-O-P were identified through the FT-IR spectra. The reduced optical band gap Ag3PO4@TiO2 was 2.9 eV Obtained from the UV-visible spectra. Photocatalysis activity was performed, and newly introduced disorder kinetics were observed. The nonlinear fit of the kinetics shows a shift over time (intercept value of linear fit -0.27) that indicates the corrosive characteristics. For an efficient catalyst, this value must be equivalent to zero. The photocorrossive disorder kinetics study demonstrates the disorder and nonlinearity of the catalyst and catalytic medium when it does not fit with a linear fit. To identify a disorder, it is important to look at the disorder kinetics of analysis.

Dysprosium (Dy3 +) doped silver Boro-phosphate glass 30 B2O3 + 40 P2O5 + 5 AgO + 10 MgO + 9 ZnO + 5 BaO + 1 Dy2O3 was created via melt quenching, and Powder X-ray diffraction was utilized to describe the material, and the absence of crystallization peaks in the spectra confirmed that the material is amorphous and glassy. Optical characteristics were carried out using the Uv–Vis analysis. The refractive index was discovered to be 1.9 at 400 nm, and the optical band gap energy was determined to be 3.6 eV. The functional regions of the produced glass were identified using Fourier Transform InfraRed and Fourier Transform -Raman spectroscopy investigations. The FT-RAMAN spectra confirmed the stretching vibrations of the borate units, while the FTIR spectrum shows the existence of phosphate and borate groups. Various prominent emission peaks were seen in the glass. The photoluminescence findings of the Dysprosium-doped silver Boro-phosphate glass showed that the excitation wavelength was 386 nm, and the emission peak was observed at 482 nm (blue) and 574 nm (yellow). CIE chromaticity coordinates of the prepared sample were determined to be x = 0.373 and y = 0.454. For usage in visible lasers and LEDs, the predicted CCT of 4494 K for the Dysprosium-doped silver Boro-phosphate glass is suitable. Vickers microhardness tester was used to evaluate the mechanical behavior of the produced glass. The glass's maximum elastic stiffness constant was 700 kg/mm2 at 200 g, and its greatest yield strength was 134 kg/mm2 at 200 g. The current components of the Dy3+ doped silver Boro-phosphate glass elemental traces were identified using the EDAX spectrum and SEM images manifested their phase formation. The Phy-X program was used to look at gamma-ray properties such as the mass attenuation coefficient, mean free path (MFP), effective atomic number (Zeff), and half-value layer. The suggested glass composition's spectroscopic characteristics indicate that it is suitable for visible lasers and LEDs and radiation shielding applications.

The slow evaporation technique was used to produce nonlinear optical ammonium pentaborate dihydrate (APBDH) single crystals. The crystal lattice parameters and structure of APBDH crystal was determined by single crystal X-ray diffraction (S-XRD) technique with the triclinic space group. The optical band gap of the grown crystal was determined using UV-Vis spectrophotometer. There is no absorption peak was observed in the entire visible region of the spectrum. The functional groups of the APBDH crystal were identified through Fourier transforms infrared (FTIR) and Fourier transform Raman (FR-Raman) analyses. The thermal decomposition and thermal stability of the grown crystal was measured using TG-DTA analyses. The laser damage threshold (LDT) analysis was used to know the ability to withstand the influence of laser on the grown crystal. Photoconductivity of the grown crystal was studied and its photocurrent and dark current behavior was examined. The surface morphology of the APBDH crystal was evaluated using HR-SEM analysis. The APBDH crystal was exhibited second harmonic generation behavior and its efficiency was calculated with different particle sizes.

This study details the synthesis of a novel series of Holmium-doped Aluminium Strontium-phosphate glass (HoAlSr- phosphate glass) composed of (P2O5)-P-55+(Al2O3)-Al-5+(MgO)-Mg-4+(NaF)-Na-5+(LiCO3)-Li-10+(CaO)-Ca-5+(SrCO3)-Sr-10+5 ZnO+(Ho2O3)-Ho-1 prepared by melt-quench method and its structural, optical, and physical properties are analysed. Powder-XRD verified its amorphous nature, FTIR shows the existence of large phosphate functional groups, Optical properties such as band gap energy was calculated by acquiring absorption spectra covering the UV, Vis, and NIR ranges. Obtained 3.02 eV optical band gap energy. The refractive index changing with increasing energy. Three peaks in the PL spectra corresponded to Ho3+ transitions: I-5(8 )-> 5G6 , I-5(8 )-> K-3(8) , and (5)I8 -> F-5(3) . The glass conducted theoretical studies for radiation shielding properties based on several key parameters. Gamma radiation shielding parameters, including Mean Free path (MFP), Effective atomic number (Z(eff)), linear attenuation coefficient (LAC), and mass attenuation coefficient (MAC), were obtained with the use of the Phy-X program. MAC data show that when Compton scattering (CS) fluctuates in the intermediate photon energy zone (E >3MeV), the area of prominence of CS diminishes. They can cause pair production at higher energies, Compton scattering at intermediate energies, and the photoelectric effect at lower energies. The MFP values of glasses doped with HoAlSr- phosphate glass were shorter, indicating a higher level of shielding efficacy. In this study we are focusing on optical properties changes with presence of Holmium ions and its shielding property using Phy-x software. In this research discovered that the synthetic material has high shielding qualities and can be a valuable shield in environments where X-rays are present. So it will be beneficial at X-ray prompted environment.

2-amino-6-methyl pyridinium L-tartrate (2A6MPLT) was used to grow a new organic nonlinear optical single crystal. The 2A6MPLT crystal grew in an orthorhombic space group P212121 crystal structure. The crystal morphology was investigated. The percentage of transmittance and optical band gap of the 2A6MPLT crystal were found to be 80% and 3.50 eV, respectively. The solid-state parameters of the grown crystals were examined. Surface laser damage threshold value of 2A6MPLT single crystals was measured to be 4.6 GW cm−2 at 1064 nm laser radiation. The photoconductivity study confirms the grown crystal is positive photoconductivity. The microhardness test was carried out employing 2-amino-6-methyl pyridinium L-tartrate crystal, and therefrom the hardness number (Hv), Meyer’s index (n), yield strength (σy) and elastic stiffness constant (C11) were assessed. The dielectric behaviour of the grown crystal was studied for different temperatures at different frequencies. The 2A6MPLT had a SHG efficiency that was 1.42 times that of KDP and 0.312 times that of Urea. The Z-scan technique with an He–Ne laser at 632.8 nm was used to analyse the third order optical nonlinearity characteristics of 2A6MPLT and its suitability in NLO applications.

In this study, manganese ion was used as a dopant to improve the electrochemical characteristics of SrO 3 –BaCO 3 –B 2 O 3 , a manganese-based cathode material. Manganese-doped strontium barium borate (MSBB) glass was synthesized using the melt quenching procedure. UV–Vis spectroscopy was used to investigate linear optical characteristics such as optical band-gap energy ( E g ), extinction coefficient ( k ), refractive index ( n ) and, optical and electrical conductivity. Furthermore, spectroscopy was employed to determine the existence of Mn 2+ and Mn 3+ oxidation states of manganese oxide in the glass composition. The dielectric characteristics ( ε r and tan δ ) and ac conductivity (σ ac ) were examined at 30°C in the frequency range of 100 Hz to 5 MHz, and the space charge polarisation is dominant at the lower frequency domain, resulting in a high dielectric constant. The increase in frequency was accompanied by an increase in ac conductivity over shorter distances, which might be explained by the mobility carrier hopping process. The paramagnetic features of prepared glass at room temperature were confirmed by vibrating sample magnetometry (VSM). The electrochemical characteristics of the prepared glass electrode in a 6 M KOH electrolyte were investigated using cyclic voltammetry (CV), galvanostatic charge–discharge, and electrochemical impedance spectroscopy (EIS). The MSBB glass electrode has the highest specific capacitance of 84 F g –1 at 2 A g –1 and the highest power density of 1388 W kg –1 , with a specific energy density of 2 Wh kg –1 . The mechanical behavior of the prepared glass under various stresses was examined using Vickers hardness measurement. The mass attenuation coefficient ( μ / ρ ), the mean free path (MFP) and the half-value layer (HVL) of the prepared glass were all evaluated.

A number of researchers have reported on the thermoluminescence (TSL) properties of many borates activated with rare earths and transition metal ions. However, there are not many reports that pinpoint the role and chemical nature of the gamma induced radicals. Further, there are even fewer reports highlighting the multifunctional characteristics of a single TSL phosphor. In this work, we showcase SrB4O7 doped with Dy3+ for the dual role of white light emitting as well as a TSL dosimetric material. We did the PL/TSL/EPR (electron paramagnetic resonance) correlation studies in order to identify the active luminescent centers, the trap parameters and the chemical nature of the radicals responsible for the phenomena. By doing a systematic study on a series of Dy3+ (1-10 mol %) doped samples, we optimized the composition. Colorimetric studies on the optimized sample revealed that it had intense near white light emission with 38.1% color purity when excited by UV-C light (247 nm). The same sample also showed a linear gamma dose response up to 1600 Gy (J/kg). A detailed EPR investigation confirmed the role of a borate based radical in the observed TSL process. We believe that the material can be a good candidate for real life application as a multifunctional material.

An organic dispirooxindolopyrrolidine (DOP) crystalline salt was synthesized by reflux method using methanol as a solvent. Molecular structure and lattice parameter of the grown crystalline salt was refined using SHELX program. The C-13 NMR and H-1 spectral analysis was used to identify the molecular structure. CHN elemental analysis was studied for DOP single crystal. The crystalline perfection of the crystal was studied using high resolution X-ray diffraction analysis. The curves are significantly sharp having a full width at half maximum (FWHM) of 37 ' for DOP crystal. The specific heat capacity of the compound was measured and found to be 1.3-2.8 J g/K from room temperature to 90 degrees. The mechanical properties of the compound was examined using Vicker's hardness tester. The magnetic property of the DOP crystal was studied using VSM analysis. (C) 2021 Elsevier B.V. All rights reserved.

Four Li-Al-Si-O-based ceramic compounds with varying Si to Li ratios were synthesized via a high-temperature reaction route and characterized by X-Ray diffraction, scanning electron microscopy, and photoluminescence techniques. Eu was used as an activator in these four compositions namely, LiAlSiO4, LiAlSi2O6, LiAlSi3O8, and LiAlSi4O10, and the radiative properties were evaluated. The activator concentration was optimized in all these samples to 2 mol%. The photoluminescence emission intensity and decay time values increased with the Si to Li ratio. The relative intensities of the emission spectra and the lifetime values indicated that the rare earth ion stabilizes itself at interstitial positions in the lattice having approximately C-2v symmetry. The chromaticity indices for the four ceramic samples doped with Eu were calculated that showed near red emission for all. To get an idea about their commercial utility, color purity, quantum efficiencies for the phosphors were evaluated. The emission profile of the prepared samples was compared with a commercial sample. The Judd-Ofelt parameters, transition probabilities, branching ratios, and quantum efficiencies were also calculated for these systems. It was observed that the metal-ligand bond covalency decreased with an increase in the Si to Li ratio which was responsible for the increase in the emission intensities and luminescence decay time values.