Dysprosium site occupancy in SrZnO nanophosphors probed through XANES.

Doping-assisted lattice site engineering is widely practiced to obtain a tailor made response, which subsequently poses a need for an efficient probe of the local electronic structure of the system. This study presents a detailed analysis of the local electronic structure around the host cations (Zn and Sr) and dopant (Dy) through combined experimental and simulated X-ray absorption near edge structure. The real space full multiple scattering-based simulations of the Zn K-edge are done by substituting Dy at cationic sites in the second coordination shell around Zn, in various combinations along with and/or without oxygen vacancies in the system.

Spectroscopic studies of metastable tetragonal ZrO nanocrystals.

This study delves into an examination of the structural and luminescent properties of zirconium dioxide (ZrO) synthesized via the solid-state combustion method. Nitrates are harnessed as the oxidizing agent, while glycine serves as the fuel. Two distinct compositions are explored: a stoichiometric 1:1 ratio and a fuel-enriched 1:2 ratio.

Intense green light emission and thermoluminescence glow curve analysis of Tb -activated CaY O phosphor.

Here, the synthesis and luminescence analysis of the Tb -activated phosphor were reported. The CaY O phosphors were synthesized using a modified solid-state reaction method with a variable doping concentration of Tb ion (0.1-2.

Electronic structure and defect-induced luminescence study of phase-stabilized t-ZrO nanocrystals.

Luminescent tetragonal-ZrO (t-ZrO ) nanocrystals were synthesized using an optimized combustion method without post-synthesis annealing and characterized using X-ray diffraction, electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, UV-Vis. spectroscopy, photoluminescence spectroscopy, thermoluminescence (TL), and vibrating sample magnetometry. The as-synthesized t-ZrO nanocrystals have a bandgap of 4.

UV/blue/green converted efficient red-NIR photoluminescence in Cr incorporated MgAlOnanocrystals: Site selective emission tailored through cation inversion and intrinsic defects.

The UV/Visible activated near-infrared (NIR) phosphors have many applications in solid state lighting, night vision devices and bio-imaging. The early research reported the red-NIR emitting phosphors doped with Crcenters upon visible light excitation. Here, in this work the intense red-NIR emission and color tuning is achieved for broad excitation range (UV/blue/green) through Cr dopant induced defect centers and cation inversionWe present the infuence of Cr dopant induced defect centers and cation inversion in MgCrAlO(x= 0.

Effect of Eu doping on the thermoluminescence of UV and gamma irradiated Mg B O nanophosphors.

This article presents the effect of europium (Eu) doping on the thermoluminescence (TL) of ultraviolet (UV-254 nm) and gamma irradiated triclinic Mg B O nanophosphors. The diffuse reflectance predicts slight decrease in band gap from 5.18 to 4.

Structural, diffuse reflectance and luminescence study of t-MgBO nanostructures.

We report here the structural, reflectance, photoluminescence and thermoluminescence study of -MgBO nanostructures synthesized using optimized combustion method relatively at much lower temperature. The rietveld refinement of X-ray diffraction data confirms single-phase triclinic crystal structure of MgBO nanoparticles. The direct band gap determined using diffuse reflectance spectra (DRS) was 5.

Oxygen vacancies induced photoluminescence in [Formula: see text] nanophosphors probed by theoretical and experimental analysis.

We report, for the first time, the influence of oxygen vacancies on band structure and local electronic structure of [Formula: see text] (SZO) nanophosphors by combined first principle calculations based on density functional theory and full multiple scattering theory, correlated with experimental results obtained from X-ray absorption and photoluminescence spectroscopies. The band structure analysis from density functional theory revealed the formation of new energy states in the forbidden gap due to introduction of oxygen vacancies in the system, thereby causing disruption in intrinsic symmetry and altering bond lengths in SZO system. These defect states are anticipated as origin of observed photoluminescence in SZO nanophosphors.

Mechanistic insights into defect generation and tuning of optical properties in ZnFeAlO(0.01 ≤ x ≤ 0.40) nanocrystals.

The correlation of several defects and optical and magnetic properties with Fe content in ZnFeAlO (0.01 ≤ x ≤ 0.40) nanocrystals has been scrutinized through X-ray diffraction, O K-edge X-ray absorption near-edge structure, FT-IR, diffuse reflectance, photoluminescence and electron spin-resonance spectroscopies, and vibrating sample magnetometry.

Switchable cool and cold white emission from dysprosium doped SrZnO.

In presented work, excitation selective novel cool and cold white emission is reported from dysprosium (Dy) doped SrZnOnanophosphors, synthesized by combustion technique. The host lattice provided selective excitation routes for Dylevels and intrinsic defects levels via charge transfer (270 nm) and host defects absorption bands (375 nm), respectively. The emission due to Dylevels was found to be exhibiting cool white emission and that from intrinsic defects was cold white emission, as characterized from correlated color temperature.

Color modulation by selective excitation activated defects and complex cation distribution in ZnMgAlO nanocrystals.

Complex cation distribution in spinel solid solution, fosters defect generation and permutates the optical properties. To scrutinize the effect on structural properties, viz. the cation distribution and defect states upon substitution of Zn with Mg; and to tune the emission properties, Zn1-xMgxAl2O4 (0.

A Novel Synthesis of the Graphene Oxide-Silver (GO-Ag) Nanocomposite for Unique Physiochemical Applications.

Graphene oxide-silver nanocomposite (GO-Ag) was fabricated via the sonochemical method, which shows unique physiochemical properties. Graphene oxide (GO) and silver nanoparticles (AgNPs) were synthesized by modified Hummer's and Chemical reduction methods, respectively. The synthesized nanocomposite was characterized using powder X-ray diffraction, Raman spectroscopy, and Fourier-transform infrared spectroscopy.

Defect states and kinetic parameter analysis of ZnAlO nanocrystals by X-ray photoelectron spectroscopy and thermoluminescence.

Defect states in ZnAlO have a significant role in its applicability as a luminescent material. To understand the nature and distribution of defects in its crystal lattice, thermoluminescence (TL) study has been carried out. Excellent TL response is observed from γ- and ultraviolet-irradiated samples at different doses and exposure durations, respectively.

Nanostructured Boron Nitride With High Water Dispersibility For Boron Neutron Capture Therapy.

Highly water dispersible boron based compounds are innovative and advanced materials which can be used in Boron Neutron Capture Therapy for cancer treatment (BNCT). Present study deals with the synthesis of highly water dispersible nanostructured Boron Nitride (BN). Unique and relatively low temperature synthesis route is the soul of present study.