Studies of Sol-Gel Evolution and Distribution of Eu3+ Ions in Glass–Ceramics Containing LaF3 Nanocrystals Depending on Initial Sols Composition

摘要: In this work, we performed a systematic analysis of the impact selected chemical reagents used in sol-gel synthesis (i.e., N,N-dimethylformamide) and different catalyst agents CH3COOH, HNO3) on formation luminescence Eu3+-doped SiO2–LaF3 nano-glass–ceramics. Due to characteristic nature intra-configurational electronic transitions Eu3+ ions within 4f6 manifold (5D0 → 7FJ, J = 0–4), they are frequently as spectral probe. Thus, changes photoluminescence profile could identify general tendency rare earth materials segregate inside low-phonon energy fluoride nanocrystals, which allows us assess their application potential optoelectronics. Fabricated materials, from sols gels xerogels nano-glass–ceramics, were examined using several experimental techniques: X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared spectroscopy (IR), measurements. It was found that distribution between amorphous silicate host LaF3 nanocrystals is strictly dependent initial composition obtained sols, lack N,N-dimethylformamide significantly promotes segregation nanocrystals. As result, detected long-lived 5D0 excited state equal 6.21 ms, predisposes glass–ceramic material for use an optical element reddish-orange emitting devices.