Lanthanide-based luminescent hybrid materials.

Intrinsically conducting polymers (ICP) and conductive fillers incorporated conductive polymer-based composites (CPC) greatly facilitate the research in electromagnetic interference (EMI) s...

Electromagnetic Interference Shielding Polymers and Nanocomposites - A Review

Magnesium-doped ZnO (ZMO) nanoparticles were synthesized through an oxalate coprecipitation method. Crystallization of ZMO upon thermal decomposition of the oxalate precursors was investigated using differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques. XRD studies point toward a significant c-axis compression and reduced crystallite sizes for ZMO samples in contrast to undoped ZnO, which was further confirmed by HRSEM studies. X-ray photoelectron spectroscopy (XPS), UV/vis spectroscopy and photoluminescence (PL) spectroscopy were employed to establish the electronic and optical properties of these nanoparticles. (XPS) studies confirmed the substitution of Zn2+ by Mg2+, crystallization of MgO secondary phase, and increased Zn–O bond strengths in Mg-doped ZnO samples. Textural properties of these ZMO samples obtained at various calcination temperatures were superior in comparison to the undoped ZnO. In addition to this, ZMO samples exhibited a blue-shift in the near band edge photo...

Mg-Doped ZnO Nanoparticles for Efficient Sunlight-Driven Photocatalysis

A review on the advancements in phosphor-converted light emitting diodes (pc-LEDs): Phosphor synthesis, device fabrication and characterization

Oxalate production by fungi: significance in geomycology, biodeterioration and bioremediation

Growth and characterization of a new metal-organic crystal: potassium thiourea bromide

Optical properties of Sm3+ ions in zinc potassium fluorophosphate glasses

Spectroscopic properties of Er3+ ions in multicomponent tellurite glasses

Spectroscopic investigations and phonon side band analysis of Eu 3+ -doped multicomponent tellurite glasses

In the present work, different concentrations of Sm 3 + ions doped lithium zinc borate glasses (LBZnFSm: Li 2 CO 3  + H 3 BO 3  + ZnF 2  + Sm 2 O 3 ) were prepared by melt quench technique. Thermal stability, amorphous nature and vibrational modes of lithium zinc borate glasses have been studied by using differential scanning calorimetry, X-ray diffraction and Fourier transform infrared spectroscopy, respectively. Spectroscopic characterization of Sm 3 + -doped lithium zinc borate glasses through absorption, excitation, emission and decay spectra has been carried out. Using absorption spectra nephelauxetic ratios, bonding parameters and energy band gap of the glass were evaluated. Judd–Ofelt (JO) intensity analysis had been performed and JO parameters were estimated for 1.0 mol.% Sm 2 O 3 doped lithium zinc borate glass. Radiative properties such as transition probabilities, branching ratios and radiative lifetime were estimated by using JO parameters. Stimulated emission cross-sections and effective bandwidths of each transition were obtained from the luminescence spectra. The decay curves of Sm 3 + -doped lithium zinc borate glasses exhibit single exponential nature for lower concentrations and gradually changes to non-exponential for higher Sm 3 + concentrations. The experimental life time, quantum efficiency and donor acceptor interaction parameters were also estimated using decay curves of 4 G 5/2 level of Sm 3 + ions in the present glasses. The non-exponential nature of the decay curves has been analyzed by Inokuti–Hirayama model indicating that ion interaction is of dipole–quadrupole nature. Dielectric studies of 0.1, 1.0 and 2.0 mol.% Sm 2 O 3 -doped glasses were undertaken and dielectric constants, Cole–Cole parameters and power-law parameters were also determined.

Cyriac Joseph

Papers

Growth and characterization of a new metal-organic crystal: potassium thiourea bromide

Optical properties of Sm3+ ions in zinc potassium fluorophosphate glasses

Spectroscopic properties of Er3+ ions in multicomponent tellurite glasses

Spectroscopic investigations and phonon side band analysis of Eu 3+ -doped multicomponent tellurite glasses

Spectroscopic and dielectric studies of Sm3 + ions in lithium zinc borate glasses