Fluoroindate glass is characterized by low phonon energy (500 cm-1 ), which enables most of the radiative transitions in the lanthanides to occur in the range VIS-NIR. It allows considering this matrix as a potential host glass for NIR emission and light sources. This work reports the fabrication and analysis of luminescence properties, and structure of the fluoroindate glasses and glass-ceramics (GC) co-doped with Eu3+ ions. The materials' microstructure and structure were analysed using X-ray diffraction (XRD) and Raman measurement techniques, respectively. It has been shown that the basic structural units in the glass network are [InF6] octahedrons tetrahedrons. The luminescence analysis was performed in the glass and glass-ceramics samples doped with EuF3 showing the excitation and emission properties and changes in the lifetimes. The excitation at 395 nm resulted in different emissions in blue, green, and red which correspond to the transitions from 5DJ (J=0 to 3) multiples to the 7FJ (J= 0 to 6), which is the effect of the low phonon energy of the matrix and is comparable with other low phonon materials. In the glass-ceramics, the effect of network ordering around the Eu3+ ions was noticed. The fluorescence intensity ratio R/O related to 5D0→7F2 and 5D0→7F1 transitions in Eu3+ decreased from 0.74 to 0.56 value. Obtained results allowed to consider this GC material as a potential host for luminescent material and possibly glass fiber sources.
The Large Mode Area (LMA) fibers are attractive in the field of new components in optical fiber technology in the field of sensing and novel radiation sources. The numerical analysis of multi-ring (multi trench) fiber construction is investigated for eye-safe transmission spectral range (1400-2100 nm). The optical fiber refractive profile construction of ∆n (0.001- 0.004) for different radial step ∆r (1.0-1.6 µm) is used for the investigation of linearly polarized modes (LP01 and LP11) propagation. The maximum mode field diameter (MFD) of LP01 was calculated. The results confirm the LMA propagation possibility in the presented fiber construction. The single-mode guiding was confirmed for different ∆n and ∆r parameters in the investigated spectral range. The cutoff wavelength <1400 nm and single-mode operation are possible for ∆n=0.001 and ∆r=1 µm.
Fluoroindate glasses co-dopped with Er3+ at different concentrations were synthesized using the melting quenching technique, where it was observed that the emission peak located at 1.53 μm associated with 4I13/2→4I15/2 transition of Er3+ increases up to 11.5 times with increasing ErF3 content up to 1.4 mol. %. Such increase is significant due to their proximity with one of the most important telecommunication windows (1.55 μm) which the spite of all the studies around it, some challenges like its efficiency need to be optimized. The effect of sensitization of the Er3+ by Yb3+ ions was also evaluated. The increase in luminescence intensity (~19%) was obtained by co-doping of 1.4ErF3 glass by 0.8YbF3. This effect is related to the efficient Yb3+→ Er3+ energy transfer.
Eu3+ - doped oxyfluoride tellurite-germanate glass-ceramics were fabricated by the controlled crystallization method. The microstructure and structure of samples were analysed using x-ray diffraction (XRD), transmission electron microscopy (TEM), and infrared spectroscopy (IR). The EuF3 introduction caused the rise of the non-bridging oxygens/fluorides in glass network in a consequence of the [TeO,F4] and [GeO,F4] structural units transformation into the [TeO,F3]/[TeO,F3+1], and [GeO,F6], respectively. These changes were caused by Eu3+ ions, which played the role as a network modifier and led to the new non-bridging oxygens/fluorides Te–O,F− Eu3+O,F−–Te, and Ge– O,F−Eu3+O,F−–Ge, linkages formation and the ZnTe crystalline phase. The structure changes caused by the Eu3 + ions incorporation in the crystalline phase have been discussed in accordance to analysed the photoluminescence (PL) spectra and decay curves. It was showed a significant increase of the 5D0 → 7F1 magnetic-dipole transition intensity and decay times for transparent glass-ceramics sample. It confirmed the migration of Eu3+ ions from the amorphous network into ZnTe nanocrystals.
In the paper, 1.4 – 2.2 μm broadband emission under 796, 808, 980 nm laser diode excitation in low phonon energy germanate glass system co-doped with 0.7Er2O3/0.35Tmo2O3 (1st core) and 0.7Tm2O3/0.15Ho2O3 (2nd core) were investigated. Next, double-core, double-clad optical fiber has been developed by the modified rod-in-tube technique. Amplified spontaneous emission (ASE) in double-clad optical fiber with 3dB bandwidth was measured to be 346 nm and 677 nm for - 10 dB. ASE spectrum is a result of the partial donor-acceptor energy transfer and superposition of Er3+: 4I13/2 → 4I13/2, Tm3+: 3F4 → 3H6, 1.8 μm and (Ho3+:5I7 → 5I8) 2 μm emission bands. Excellent spectroscopic properties indicate that the developed germanate optical fiber is a promising active element for construction compact, broadband ASE sources.
In the article, the effect of samarium ions doping on the spectroscopic and biological properties of 45S5 Bioglass® was presented. The luminescence spectra of doped glasses have been analyzed in the visible range under 405 nm laser excitation. The in vitro method for testing the apatite-forming ability of bioactive glasses was used. Crushed to 100μm fractions bioactive glasses were immersed in Simulated Body Fluid (SBF) prepared by the Kokubo method. The material was incubated at 37°C for 3 days and then the measurements of ions (Ca, Na, Si) release in SBF were carried out. The bioactivity test indicated that Sm3+ ions affect not only on the luminescent properties of the bioactive glasses but also their capability of creating the hydroxycarbonate-apatite (HCA) layer.
The article presents the use of Eu3+ ions as a spectroscopic probe to measure changes in glass structure without interfering with the tested material. The aim of the work is to obtain bioactive glass-ceramics structure with increased mechanical properties. Examined 45S5 Bioglass® was annealed at 620°C for 8h. XRD measurements indicate the formation of the glass-ceramics structure with nanocrystals (Na4CaSi3O9). Despite the additional heat treatment, the bioactivity of the glass has been preserved. The changes of luminescence profile of Eu3+ - doped glass was determined. Decreasing value of fluorescence intensity radio parameter after annealing indicates symmetry around europium ions and thus the arrangement of the glass structure.
In the article, we showed the unconventional method to determine the degradation of Bioglass 45S5 doped with samarium ions used as an optical probe. The strongest emission at the wavelength of 601 nm has been observed under 405 nm laser excitation. We used the alternative method of fiber drawing from the 45S5 glass. Bioactive glass fiber was immersed in Sorensen buffer at temperature 37°C. In situ analysis of luminescence signal of glass fiber shown a decrease in intensity within 24 hours. This effect was connected with partial surface degradation of bioglass fiber.
The paper presents thermal and mechanical properties of bioactive S53P4 BoneAlive® and glass13-93 fibers. The aim is to fabricate bioactive glass fibers from the well-known bone reconstructive S53P4 and 13-93 glasses. Examined glasses were drawn using the modified rod-in-tube method. In this study tensile strengths for S53P4 and 13-93 fibers on mean diameters 39 and 34μm respectively were measured. Differential scanning calorimetry of this materials before and after drawing process was also investigated. Bioactive fibers have been considered for future medical application for reinforcing nanocomposites.
In this work, thermal and spectroscopic properties of antimony-germanate glasses have been presented. Investigated glasses with the different molar content of alkalis (Na2O and K2O) have been co-doped with erbium and silver ions in order to obtain luminescence in the near-infrared region. Along with the increment of alkalis content, an increase of thermal stability parameter ΔT has been observed. High concentration of Na2O and K2O in the glassy matrix results in the presence of a plasmonic peak at the wavelength of 454 nm originating from large volume fraction of silver nanoparticles. Change of the luminescence parameters in the near-infrared region (Er3+: 4 I13/2→4I15/2) has been observed in the function of alkalis content in the glass matrix, which high concentration increases the volume fraction and size of silver nanoparticles promoting the energy transfer channel Er3+→Ag.
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