GdO-modulated borate glass for the enhancement of near-infrared emission energy transfer from Gd to Nd.

(LiO)(SrO)(NdO)(BO)(GdO), where = 0, 3, 5, 7, and 10 mol%, glass was melt-quenched to test it as a laser source in the near-infrared (NIR) region. The structural modification, absorption spectra, Judd-Ofelt (J-O) parameters, luminescence spectra, radiative laser parameters, lifetimes, XRD, and FTIR spectra were studied. Luminescence spectra excited at = 584 nm revealed the highest intensity peak at 1073 nm due to the transition of F → I.

Investigation of Structural, Mechanical, Optoelectronic, and Thermoelectric Properties of BaXF (X = Co, Ir) Fluoro-Perovskites: Promising Materials for Optoelectronic and Thermoelectric Applications.

Coded within Wien2K, we carry out DFT-based calculations for investigations of the structural, elastic, optoelectronic, and thermoelectric properties of BaXF (X = Co, Ir) fluoro-perovskites. The Birch-Murnaghan fit to the energy-vs-volume data and formation energy shows that these fluoro-perovskites are structurally stable. The phonon calculation confirms the thermodynamic stability, while the relation between elastic constants such as - > 0, > 0, + 2 > 0, and > 0 validates the mechanical stability of the compounds.

First-principles structural, elastic and optoelectronics study of sodium niobate and tantalate perovskites.

The intensified quest for efficient materials drives us to study the alkali (Na)-based niobate (NaNbO) and tantalate (NaTaO) perovskites while exploiting the first-principles approach based on density functional theory, coded within WIEN2K. While using the Birch Murnaghan fit, we find these materials to be stable structurally. Similarly, the ab-initio molecular dynamics simulations (AIMD) at room temperature reveals that the compounds exhibit no structural distortion and are stable at room temperature.

Luminescence characteristics of Sm-doped lithium barium gadolinium silicate glasses for Orange LED's.

Traditional melt-quenching technique is adopted for synthesis of SmO doped lithium barium gadolinium silicate (LBGS: LiO-BaO-GdO-SiO) glasses. These glass samples are characterized by different spectroscopic techniques under ambient conditions. Density and molar volume of the present LBGS glass samples increase with increasing Sm ion-concentration.

Energy transfer phenomenon of Gd to excited ground state of Eu ions in LiO-BaO-GdO-SiO-EuO glasses.

LiO-BaO-GdO-SiO glasses with different concentration of Eu ions were developed by the traditional melt quenching technique and characterized via FTIR, absorption, excitation, emission and CIE color coordinates analysis for visible red emission application. The FTIR shows strong band at position 740 cm which is attributed to Si-O-Si symmetric stretching mode. Density and molar volume of LBGSEu glasses increases with Eu ions concentration.