Optical applications of glass-ceramics

Influence of CoO addition on phase separation and crystallization of glasses of the ZnO–Al2O3–SiO2–TiO2 system

“…As the temperature was raised, gahnite and at higher temperatures rutile crystallized, in the process, the residual glass phase became depleted in zinc, aluminum and titanium. Also we demonstrated that when transition metal oxides were added to parent glasses, they participated in amorphous phase separation in such a manner that the phase formed at early stages of phase separation contained these ions [7].…”

“…Among other materials, Co 2+ -doped spinel single crystals and glass-ceramics are the materials of choice for passive Q-switching of Er:glass lasers [2][3][4][5][6][7]. Glass-ceramics prepared by the controlled nucleation and crystallization of glasses [8] possess several advantages over conventional powder-processed ceramics and single crystals.…”

Controllable synthesis and selective doping of hexagonal GdF3 and spinel-like Ga2O3 nano-crystals in silicate glass

“…The absorption spectrum of the precursor glass consists of two main absorption bands with maxima at about 434 and 846 nm, which can be ascribed to the transitions 3 E′(F)→ 3 A′ 2 (P) and 3 E′(F)→ 3 A′ 2 (F) of the trigonal bipyramic fivefold and tetrahedral Ni 2+ ions in silicate glass [16]. After annealing at 620 ℃ , when GdF 3 nano-crystals precipitated from the glassy matrix, the 6 line-shape of the absorption spectrum almost remains unchanged, implying that Ni 2+ are still located in the residual glassy matrix, i.e., Ni 2+ [18], it could be speculated that Ni 2+ ions are partitioned into the Ga 2 O 3 nano-crystals by substituting for octahedral Ga 3+ . It is reported that the intensity of the absorption bands arising from Ni 2+ in tetrahedral sites is about 10-100 times higher than that in octahedral sites [19].…”

“…Glass ceramics containing fluoride, chalcogenide, or oxide nano-crystals are developed for application in broadband optical amplifications, white light-emitting diodes, tunable lasers, solar cells, and so on [2][3][4][5]. Recently, a combination of various properties in a glass ceramic allows developing multifunctional materials [6][7][8].…”

Structure and upconversion luminescence of transparent glass-ceramics containing (Er,Yb)2(Ti,Zr)2O7 nanocrystals

“…Addition of ZrO 2 to yttrium and erbium titanates leads to a structural transformation from the ordered-pyrochlore to the disordered-pyrochlore structure and then to the defect-fluorite structure [39,40]. Recently we have prepared transparent magnesium aluminosilicate glass-ceramics containing (Er , Yb) 2 (Ti,Zr) 2 O 7 nanocrystals and have shown that with increasing the heat-treatment temperature, the phase transformation occurs between the defect-fluorite and disordered pyrochlore type structures [41][42][43]. We have shown that such glass-ceramics demonstrate intense green and red UCL [43,44].…”