Composition dependence of the optical and structural properties of Eu-doped oxyfluoride glasses

Near white light emission of Ce3+‐, Ho3+‐, and Sm3+‐doped oxyfluoride silicate glasses

“…For SFAC: 0.1C0.8H0.1S and SFAN: 0.1C0.8H0.1S, three absorption bands located at 1400‐810, 800‐620, and 540‐400 cm −1 are observed. The vibration types corresponding to the respective absorption bands of samples are depicted as the following . The absorption band in the range of 1400‐810 cm −1 is due to the asymmetric stretching vibrations of Si–O–Si bonds within [SiO 4 ] tetrahedral.…”

“…In the FT‐IR spectra of samples SFBC: 0.1C0.8H0.1S and SFABC: 0.1C0.8H0.1S, four absorptions located at 1600‐1220, 1200‐810, 800‐620, and 540‐400 cm −1 are observed. The assignments of the vibration types for the respective absorption bands of samples are described as the following . The absorption band from 1600 to 1220 cm −1 is attributed to the B–O asymmetric stretching vibrations of trigonal [BO 3 ] units.…”

“…The vibration types corresponding to the respective absorption bands of samples are depicted as the following. [29][30][31] The absorption band in the range of 1400-810 cm À1 is due to the asymmetric stretching vibrations of Si-O-Si bonds within [SiO 4 ] tetrahedral. The absorptions from 800 to 620 cm À1 correspond to the Al-O bending vibrations of [AlO 4 ] units.…”

Ce3+‐ and Dy3+‐Doped Oxyfluoride Borosilicate Glasses with Near White Luminescence

“…Figure shows the FT‐IR spectra of samples SBA3, SBA8, and SBA9, where four main absorption bands can be observed. The vibration types corresponding to the respective absorption bands are described as the following . The absorption bands in the range of 1600–1200 cm −1 are attributed to the B‐O stretching vibrations of [BO 3 ] units.…”

Stabilization of divalent Eu2+ in fluorosilicate glass-ceramics via lattice site substitution

“…Generally, there are several ways to transform Eu 3+ into Eu 2+ : (i) adding reducing agents, [10][11][12] (ii) inputting reducing atmosphere during preparation processes, 13,14 (iii) adjusting optical basicity or electronegativity of host, 15,16 (iv) substituting M 2+ sites in crystalline lattices. 17,18 As strategies (i) and (ii) accompany drawbacks such as introducing impurities into the system or leading to infeasibility for elaborated optimization of concentration and distribution of Eu 2+ , strategies (iii) and (iv) are usually considered to be more executable. Using strategy (iv), silicate, 19,20 aluminosilicate, 10,15,21 borophosphate 22,23 and uoride crystalline phases [24][25][26] have been reported as good stabilizers for divalent Eu 2+ .…”