Magnesium Borate Glass Research Articles

Optical and erbium ion concentration correlation in lithium magnesium borate glass

Tuning the optical response of lithium magnesium borate glass via controlled doping of rare earth ions is the key issue in photonic devices. Glasses with composition 30Li2O–(60−x)B2O3–10MgO-xEr2O3, where 0≤x≤1 are prepared by conventional melt-quenching technique. The X-ray diffraction (XRD) pattern confirms the amorphous nature of all samples. Fourier transform infrared (FTIR) spectra reveal the presence of BO3 and BO4 local structure unit. The physical parameters, such as the direct and indirect optical energy band gap, oscillator strength, refractive index, ion concentration, Polaron radius, molar volume and inter-nuclear distance are calculated and analyzed. The room temperature UV–vis–IR spectra comprised of ten absorption bands centered at 1523, 973, 796, 650, 550, 522, 486, 447, 406, 373nm corresponding to the transitions from the ground state to 4I13/2, 4I11/2, 4I9/2, 4F9/2, 4S3/2, 2H11/2, 4F7/2, (4F5/2+4F3/2), 2G(1)9/2, 4G11/2 excited states, respectively. The peak evidenced at 522nm is due to hypersensitive transition. The up-conversion spectra exhibits three emission peaks centered at 509, 547 and 656nm. All the emission bands (green and red) at 0.5mol% of Er3+ shows a significant enhancement in the intensity attributed to the energy transfer from Mg2+ to the Er3+ ion. Our results suggest that these glasses can be nominated for solid state lasers.

Influences of dysprosium and phosphorous oxides co-doping on thermoluminescence features and kinetic parameters of lithium magnesium borate glass

This paper presents the main dosimetric characteristics and kinetic parameters of a newly proposed borate glass dosimeter modified with lithium and magnesium oxide (LMB) and co-doped with Dy2O3 and P2O5. Dosimetric features include thermoluminescence (TL) glow-curve, annealing procedure, TL sensitivity, photon dose response, fading, reproducibility, minimum detectable dose, kinetics order, activation energy (E) and frequency factor (s). The proposed dosimeter exhibits simple glow curves, good linearity from 0.01 up to 4 Gy, easy annealing, excellent reproducibility and minimal fading. These attractive features will pave the way to its use in radiation dosimetry.

Physical and optical properties of Li2O-MgO-B2O3 doped with Dy3+

The study on the optical properties of alkali borate glasses doped with rare earths is an interesting area of research. Dysporosium doped lithium magnesium borate glasses were prepared by melt-quenching technique with dysporosium concentration varying from 0.3 to 1.0 mol %. Physical and optical properties of Lithium Magnesium Borate doped with different concentration of Dy3+ were observed based on its physical parameters, emission spectra and absorption spectra. The absorption spectra of this study exhibits eight absorption bands with hypersensitive peak at 1260 nm (6H9/2). Two emitted spectra transitions were also observed at 4F9/2 → 6H15/2, 4F9/2 → 6H13/2. Lastly, important physical parameters for each concentration of dopant such as density, ions concentration, polaron radius, inter-nuclear distance, refractive index, oscillator strength and other parameters were determined.

Impact of Nd3+ ions on physical and optical properties of Lithium Magnesium Borate glass

Enhancing the up-conversion efficiency of borate glass via optimized doping of rare earth ions is an ever-ending quest in lasing glass. Neodymium (Nd3+) doped Lithium Magnesium Borate (LMB) glasses are prepared using the melt-quenching method. X-ray diffraction (XRD), Fourier transformed infrared (FTIR), UV–Vis–NIR absorption and Photoluminescence (PL) spectroscopic characterizations are made to examine the influence of Nd3+ concentration on physical properties and optical properties. Nd3+ contents dependent density, molar volume, refractive index, ion concentration, Polaron radius, inter nuclear distance, field strength, energy band gap and oscillator strength are calculated. XRD patterns confirm the amorphous nature of all glasses and the FTIR spectra reveal the presence of BO3 and BO4 functional groups. UV–Vis–IR spectra exhibit ten prominent bands centered at 871, 799, 741, 677, 625, 580, 522, 468, 426, 349nm corresponding to the transitions from the ground state to 4F3/2, (4F5/2+2H9/2), (4F7/2+4S3/2), 4F9/2, 2H11/2, (4G5/2+2G7/2), (2K13/2+4G7/2+4G9/2), (2G9/2+2D3/2+2P3/2), (2P1/2+2D5/2), (4D3/2+4D5/2) excited states, respectively. A hyper-sensitive transition related to (4G5/2+2G7/2) level is evidenced at 580nm. The room temperature up-conversion emission spectra at 800nm excitation displays three peaks centered at 660, 610 and 540nm. Glass with 0.5mol% of Nd3+ showing an emission enhancement by a factor to two is attributed to the energy transfer between Mg2+ and Nd3+ ions. Our results suggest that these glasses can be nominated for solid state lasers and other photonic devices.

Physical and optical properties of Li2O–MgO–B2O3 doped with Sm3+

Samarium oxide doped lithium magnesium borate glass has been prepared using conventional melting method. The density and molar volume have been calculated and analyzed while their optical properties were studied by measuring the optical absorption and luminescence spectra at room temperature. From the XRD results, since the patterns do not exhibit any diffraction line thus it confirms their amorphous nature. It was found that the density of the glass samples increased and the molar volume decreased with respect to Sm3+ ions content. Meanwhile, the absorption spectra of this study showed four absorption bands with most outstanding peak at 1230nm (6H5/2–6F7/2). Three emitted spectra transition were observed in this study which are 4G5/2–6H5/2 (blue), 4G5/2–6H9/2 (green), and 4G5/2–6H11/2(yellowish green). A great enhancement in the PL peaks at green region are observed particularly with the 0.5mol% concentration, which may attribute to the energy transfer from Mg2+ to the trivalent ions of samarium oxide. Beyond the optimum concentration an opposite effect was remarked. This dwindling is attributed to the concentration quenching phenomenon. The current results agreed with other systematic studies that Sm3+ doped with lithium magnesium borate glasses are attractive solid-state laser materials for generation of various visible lights.