Network structure of B2O3–PbO and B2O3–PbO–PbBr2 glasses analyzed by pulsed neutron diffraction and Raman spectroscopy

Local field effects on the radiative lifetime of emitters in surrounding media: Virtual- or real-cavity model?

“…From a recent study of the network structure of B 2 O 3 -PbO, 16 it can be seen that the bond length B-O is less than 0.15 nm, while Pb-O is between 0.25 to 0.3 nm, comparable with the usual bond length between a rare-earth ion and O ion. Therefore a rare-earth ion can only substitute a Pb ion in the glass.…”

Effect of Dy3+ ions concentration on optical properties of lead borosilicate glasses for white light emission

“…Rare earth ions emit intense radiations in the ultraviolet (UV)-visible (VIS) and near infrared (NIR) regions due to the 4f → 4f and 4f → 5d transitions under different excitation wavelengths. In order to get high quality laser glasses, number of hosts were studied and among them, the PbO-H 3 BO 3 -SiO 2 glasses are found to be the excellent hosts due to their unique physical and structural properties [5][6][7]. In this glass system, the presence of PbO-H 3 BO 3 causes various borate groups and boroxil rings, where as the addition of Al 2 O 3 improves the optical quality of the glass and decreases the effective phonon energy of the host glass [8][9][10].…”

Influence of Fe2O3 on the physical, structural and electrical properties of sodium lead borate glasses

“…Moreover, PbO-B 2 O 3 glasses have desirable characteristics against irradiation, since the naturally occurring stable boron isotope is a good absorber of thermal neutrons [12] and lead is known as a shielding material of γ-rays [13]. It is now well known that lead oxide (PbO) is unique in its influence on the glass structure and is widely used in glasses, because it enhances the resistance against devitrification, improves the chemical durability and lowers the melting temperature [14].…”