Preparation of transparent oxyfluoroborate glass-ceramics containing CaF2〈Eu〉 crystals

Transparent oxyfluoride glass ceramics

“…Also, other data [26] indicate that neodymium ions are practically absent in nanocrystaline PbF 2 phase distributed in the glass matrix. In [211], europium was not extracted by CaF 2 , for its (Eu) luminescence spectra did not change after the partial glass crystallization. However, the latter fact may be explained by the specific glass composition that includes bismuth in its matrix, and rare earth ions could have occupied bismuth positions in the glass.…”

“…Indeed, the composition of the starting glass material should be chosen within the close proximity of the boundaries of the area of glass formation in the corresponding multicomponent matrix system. Otherwise, one A c c e p t e d M a n u s c r i p t 9 can obtain just surface crystallization instead of uniformly distributed crystallization [211].…”

Eu3+ ion distribution in oxyfluoride glass nanocomposites

“…Preliminary room temperature optical spectroscopy measurements of our samples revealed Eu 3+ luminescence in the red spectral region (see inset of Figure 3), while the broad blue emission characteristic to Eu 2+ in oxyfluoride glasses [11,14,31,32] as well as in CaF 2 crystals [33,34] was not observed in the investigated glass ceramics. Literature is already abundant with room temperature Eu 3+ luminescence spectra in CaF 2 containing glass ceramics [12,13,[17][18][19][20][21][22], therefore only the novel aspects are emphasized here. Eu 3+ luminescence intensity in the glass ceramics depending on EuF 3 content in the initial composition is shown in Figure 3.…”

“…Eu 3+ and Eu 2+ ions are sensitive to crystallization induced local structure changes, which modify luminescence propertiesintegral intensity, spectral composition and decay timeof the material [10][11][12][13][14][15][16][17][18][19][20][21]. It has also been observed that crystallization of CaF 2 during the melt cooling process promotes reduction of Eu 3+ to Eu 2+ [22].…”

Enhanced upconversion emission in crystallization-controllable glass-ceramic fiber containing Yb3+-Er3+codoped CaF2nanocrystals

“…CaF 2 crystal is an important optical material with high Re 3+ ion solubility, and is highly transparent from 0.13 to 9.5 μm [11,12]. Transparent CaF 2 glass-ceramic has been successfully prepared in various glass systems [4,[11][12][13][14][15][16][17]. However, there have been few investigations about the fabrication of the oxyfluoride glass-ceramic fibers.…”