The Impact of Silver Codoping on Tb Luminescence in Lithium Tetraborate Glasses.

Spectroscopic properties of Tb-doped and Tb-Ag codoped lithium tetraborate (LTB) glasses with LiBO (or LiO-2BO) composition are investigated and analysed using electron paramagnetic resonance (EPR), optical absorption, photoluminescence (PL) and photoluminescence excitation (PLE) spectra, PL decay kinetics and absolute quantum yield (QY) measurements. PL spectra of the investigated glasses show numerous narrow emission bands corresponding to the D → F (J = 6-0) and D → F (J = 5-3) transitions of Tb (4f) ions. The most intense PL band of Tb ions at 541 nm (D → F transition) is characterised by a lifetime slightly exceeding 2.

Effect of gamma-irradiation on the photoluminescence of silver-doped lithium triborate glass.

Optical-luminescence properties, including absorption spectra, photoluminescence excitation spectra, and changes in photoluminescence spectra after irradiation with -rays in the dose range of 1-3 Gy, were measured for novel : dosimeter glass. A clear dependence of the intensity of the photoluminescence (PL), with a maximum of approximately 300 nm, on the dose value when excited by light with =220 was observed. The mechanism of PL in -irradiated : glass is proposed to be a consequence of radiation annihilation with the emission of relaxed exciton-like electronic excitations with the participation of impurity defects ( ) in the glass structure.

On the issue of textured crystallization of Ba(NO) in mesoporous SiO: Raman spectroscopy and lattice dynamics analysis.

The lattice dynamics of preferentially aligned nanocrystals formed upon drying of aqueous Ba(NO) solutions in a mesoporous silica glass traversed by tubular pores of approximately 12 nm are explored by Raman scattering. To interpret the experiments on the confined nanocrystals polarized Raman spectra of bulk single crystals and X-ray diffraction experiments are also performed. Since a cubic symmetry is inherent to Ba(NO), a special Raman scattering geometry was utilized to separate the phonon modes of A and E species.

Optical nonlinearities in LiKBO-AgO and LiKBO-AgO-GdO glasses containing Ag nanoparticles.

The results on optical studies of LiKBO-AgO and LiKBO-AgO-GdO glasses containing Ag nanoparticles formed during annealing in vacuum and air are presented. Strong bands that appear in optical transmission spectra of the samples correspond to plasmon excitations associated with Ag nanoparticles. The average radius of Ag nanoparticles was retrieved from FWHM of the plasmon bands and found to be 1.

Formation of silver nanoparticles in LiBO-AgO and LiBO-GdO-AgO borate glasses.

Results of investigations of 98.0LiBO-2.0AgO and 97.