Microstructure and luminescence of erbiumdoped Na2O/K2O/CaO/CaF2/Al2O3/SiO2 nano glass-ceramics

Transparent Aluminosilicate Oxyfluoride Glass Ceramics Containing Upconversion Luminescent CaF2 Nanocrystals: Glass-to-Crystal Structural Evolution Studied by the Advanced Solid-State NMR Spectroscopy

“…The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.jpcc.9b10433. Fluorine quantification results; DSC results; deconvolution of 19 F MAS spectra of parent glasses, glass ceramics, La 3+ -doped glasses, and La 3+ -doped glass ceramics; deconvolution of 29 Si MAS spectra; 27 Al TQMAS spectrum; XRD patterns of (55 − x)Si−(15 + x)Al series glasses, 5La glass, and 5Er glass; TEM of glass ceramics; 27 Al(IV) { 19 F} REDOR results of glass ceramics; 19 F static spin echo NMR results; 19 F, 27 Al, and 29 Si MAS spectra of Er 3+ -doped glasses; 19…”

“…Fu et al first reported Eu 2+ -doped transparent oxyfluoride glass ceramics containing CaF 2 nanocrystals where the Eu 2+ has higher luminescence than in the precursor glasses . Subsequently, numerous studies reported the optical properties of various REIs-doped these materials. − A strong fluorescence emission at around 2.7 μm was observed from ErF 3 :CaF 2 fluorophosphate glass ceramics, implying potential applications for infrared (IR) lasers and amplifiers . The X-ray excited luminescence (XEL) intensity of Tb 3+ -doped germanate glass ceramics containing CaF 2 nanocrystals is about 50% of that of the commercial Bi 4 Ge 3 O 12 (BGO) scintillating crystal, making it a promising scintillating material used in X-ray detection for slow event .…”

Fluorine loss determination in bioactive glasses by laser‐induced breakdown spectroscopy (LIBS)

“…Fluorine losses in glasses are strongly dependent on the composition. While in bioactive glasses in the system SiO 2 ‐P 2 O 5 ‐CaO‐CaF 2 fluorine losses are typically in the range between 5 and 23%, 2,19 in oxyfluoride glasses much higher fluorine losses between 30 and 40% have been reported 11,12,20‐22 ; in the system SiO 2 ‐TiO 2 ‐SrO‐SrF 2 even as high as 63% 23 . The use of lids on the crucibles during melting as well as pre‐calcined raw materials (decreasing the water content, thereby avoiding the fluoride loss as HF) is highly recommended to increase fluorine retention during melting 4,12 …”

“…An additional challenge in the fluorine determination by EDXS, especially in glasses, is the fluoride mobility under the electron beam irradiation, 28 which considerably affects the accuracy of the quantification. However, recent advances in energy‐dispersive spectroscopy in combination with the silicon drift detector (SDD) enable an accurate quantification of low atomic number elements, including fluorine 22,29 …”

“…However, recent advances in energy-dispersive spectroscopy in combination with the silicon drift detector (SDD) enable an accurate quantification of low atomic number elements, including fluorine. 22,29 One of the most common methods to quantify the fluorine content in glasses is X-ray fluorescence (XRF) spectroscopy. 30 However, a large error and a high average lower limit of detection of about 1-10 μg/g is associated with XRF.…”