Abstract
Technology of active glass-ceramics (GC) is an important part of luminescent materials engineering. The classic method to obtain GC is based on annealing of parent glass in proper temperature and different time periods. Generally, only the bulk materials are investigated as a starting host for further applications. However, the effect of an additional heat-treatment process on emission and structural properties during GC processing is omitted. Here, we focus on the possibility of obtaining transparent glass-ceramic doped with europium ions directly with a melt-quenching method. The influence of phosphate concentration (up to 10 mol %) on the inversion symmetry of local environment of Eu3+ ions in antimony-germanate-silicate (SGS) glass has been investigated. The Stark splitting of luminescence spectra and the local asymmetry ratio estimated by relation of (5D0→7F2)/(5D0→7F1) transitions in fabricated glass confirms higher local symmetry around Eu3+ ions. Based on XRD and SEM/EDX measurements, the EuPO4 nano- and microcrystals with monoclinic geometry were determined. Therefore, in our experiment, we confirmed possibility of one-step approach to fabricate crystalline structures (glass-ceramic) in Eu–doped SGS glass without additional annealing process.
Highlights
In photonic material technology, transparent glass-ceramic (GC) with active nanocrystals is still required [1,2,3,4]
The europium (Eu3+ ) ion is one of the interesting to analyze luminescence properties because: (i) it is characterized by relatively high quantum efficiency since the energy gap between the 5 D0 emitting level and the underlying 7 FJ multiplet is approx. 12,000 cm−1, which means that the non-radiative decay is less likely to occur even in hosts with high phonon energies such as phosphate and silicate glasses
It is well known that the intensities of emission optimum emission characteristics for glass-ceramic applications, the influence of glass composition bands of europium ion in glasses depend on its concentration and glass composition [11,12,13,14]
Summary
Transparent glass-ceramic (GC) with active nanocrystals is still required [1,2,3,4]. 12,000 cm−1 , which means that the non-radiative decay is less likely to occur even in hosts with high phonon energies such as phosphate and silicate glasses. 0 is less 1 likely to occur even in hosts with high phonon energies such as phosphate and silicate 3+ ions-doped. ); (ii) theEu intensity ratio between ceramization process; and the opticalelectrical-dipole material can be(ED: used as an efficient phosphor dipole It be is known thatsymmetry the intensities emission bands of ceramization process; and (iii). It is well known that the intensities of emission optimum emission characteristics for glass-ceramic applications, the influence of glass composition bands of europium ion in glasses depend on its concentration and glass composition [11,12,13,14]. A lot of photonic to obtain optimum emission characteristics for glass-ceramic applications, the influence of glass glasses after ceramization presenteddependence in original studies papersof[5,15,16,17,18,19,20]
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