Crystallization and upconversion luminescence of distorted fluorite nanocrystals in Ba2+ containing oxyfluoride glass ceramics

Cubic and rhombohedral Ba4Lu3F17:Er3+ in transparent glass ceramics: Crystallization and upconversion luminescence

“…6 a). The increase of the Er 3+ content in the precursor glass drastically change the relative intensity ratio of the green and red emission bands of the glass ceramics; the ratio is considerably higher than in similar Ba 4 RE 3 F 17 containing glass ceramic systems reported previously and it is attributed to enhanced rate of cross-relaxation processes between erbium ions [25,26]. The photographs of glass ceramic doped with 0.1-3% ErF 3 are shown in Fig.…”

“…In addition, two distorted fluorite phases are known: Ba 4 RE 3 F 17 (RE=Sm-Lu) with rhombohedral distortion and high temperature modification Ba 2 REF 7 (RE=Dy-Lu) with tetragonally distorted fluorite structure [18,19]. In oxyfluoride glass ceramics the formation of several fluorite type phases such as Ba 2 LaF 7 [20], BaGdF 5 [21], BaYF 5 [22], BaYbF 5 [23], BaLuF 5 [24] and rhobohedrally distorted fluorite phases Ba 4 Gd 3 F 17 [25], Ba 4 Y 3 F 17 [26], Ba 4 Yb 3 F 17 [27] have been reported.…”

“…We have recently developed new glass ceramics containing Ba 4 RE 3 F 17 (RE=Gd, Y and Yb) [25][26][27]. For Er 3+ doped materials, hosts containing Lu 3+ should ensure efficient incorporation of activation ions in the crystalline phase.…”

Adjustable multicolor up-energy conversion in light-luminesce in Tb3+/Tm3+/Yb3+ co-doped oxyfluorifFde glass-ceramics containing Ba2LaF7 nanocrystals

“…As a result, small Ba 2 LaF 7 nanocrystals can precipitate in the glassy matrix, and single crystals (see Fig. 2(b) ) can be obtained, indicating a relatively low viscosity of the base glass at the crystallization temperature 26 . Although the nanoparticles are not exactly of the same size, they have similar grain size with an average value of about 39 nm.…”

Development of gadolinium calcium phosphate oxyfluoride glass for radiation shielding materials

“…In order to combine the advantages of oxide and fluoride glasses, the oxyfluoride glasses were developed. So, oxyfluoride glasses are the glasses with lower phonon energy, better chemical and mechanical stabilities which is more favorable for practical applications [7][8][9]. Gadolinium (Gd) has high atomic number (64), high density (7.895 g/cm 3 ) and has paramagnetic property at room temperature with a ferromagnetic Curie point of 20°C and does not produce color center in glass [10].…”