FT-IRRS, UV–Vis–NIR absorption and green upconversion in Er3+ doped lead silicate glass

Green and red fluorescence upconversion in neodymium-doped low phonon antimony glasses

“…The average electronegativity of anions ( A ) or cations ( C ) can be evaluated by the following simple additive relation [7,8]:…”

“…The enormous interest in frequency upconversion materials mainly because a visible laser source pumped by a NIR laser would be useful for high capacity data storage optical devices, bar-code reading, submarine communications, laser printing, biotechnology, biomedical instruments and diagnostics, three-dimensional displays, remote sensing thermometers for high temperature application, etc. [5][6][7][8][9][10][11][12][13]. The trivalent neodymium ion (Nd 3+ ) is one of the most important active ions in the RE family (cerium to lutetium) due to its favorable energy level structure [14], that has been most conveniently exploited in upconversion processes in a wide variety of crystals [15][16][17][18], optical fibers [19] and glassy materials [20,21].…”

“…The phonon energy corresponds to the highest energy stretching vibration bond, for example Si-O-Si bond in silica and silicate glasses, of the network forming components of the glass [33]. The multiphonon decay rate is larger due to larger highest stretching vibrational energy in silicate glasses (1060-1150 cm −1 ) compared to that in germanate (800-975 cm −1 ), tellurite (600-850 cm −1 ), fluoride (500-600 cm −1 ), and chalcogenide (200-300 cm −1 ) [7,32]. Antimony oxide (Sb 2 O 3 )-based glasses are also expected to have lower phonon energies due to lower stretching vibration of Sb-O-Sb bond (605 cm −1 ) [34].…”

Structure, dielectric and optical properties of Nd3+-doped LiTaO3 transparent ferroelectric glass–ceramic nanocomposites

“…This phenomenon is popularly known as the "nephelauxetic effect" after Jørgensen [47]. Similar correlation between the rare-earth band position shift and the degree of covalent character of various hosts has been established by Karmakar et al [46,48,49].…”

Optical absorption and emission properties of Pr3+ and Er3+ in lithium cesium mixed alkali borate glasses

“…Chen et al [22,23] reported optical properties of Er 3+ -doped PbO and B 2 O 3 -based glasses with broad 1.5 mm absorption linewidth and low refractive index. Karmakar and Dwivedi [24] reported FT-IRRS, UV-VIS-NIR absorption and green up-conversion in Er 3+ -doped lead silicate glass. Xu et al [25,26] studied host dependent frequency up-conversion of Er 3+ -doped oxyfluoride tellurite glasses and also studied composition-dependent up-conversion of Er 3+ doped PbF 2 -TeO 2 glasses.…”