Glasses and Optical Materials: Current Issues and Functional Applications: Optical Properties and Processing of Amorphous Solids
Sponsored by: ACerS Basic Science Division, ACerS Glass & Optical Materials Division
Program Organizers: Jessica Rimsza, Sandia National Laboratories; Delia Brauer, Otto Schott Institute of Materials Research
Monday 2:00 PM
October 18, 2021
Room: B231
Location: Greater Columbus Convention Center
Session Chair: Jungmin Ha, Lawrence Livermore National Laboratory
2:00 PM
3D Printed Germania-titania-silica Glasses to Tune the Refractive Index and Abbe Number: Jungmin Ha1; Koroush Sasan1; Timothy Yee1; Andrew Lange1; Du Nguyen1; Nikola Dudukovic1; Oscar Herrera1; Christopher Mah1; Rebecca Dylla-Spears1; 1Lawrence livermore National Laboratory
Development of gernamia-titania-silica glasses compatible with direct ink writing (DIW) 3D-printing is reported in this study. Colloidal germania and titania-silica core-shell feedstocks are prepared by a sol-gel method and converted to printable inks for DIW. The inks are densified to glass using heat treatment. The main achievements of this work are (1) the successful preparation of the germania-titania-silica sol inks with desired viscosities to be printed despite three different compositions in the inks, (2) an increase in the refractive index of 3D printed glasses beyond previous reports of titania or germania in glasses, (3) the investigation on the roles of titania and germania in glasses to increase in the refractive index of the glasses, and (4) the independent tuning of the refractive index and Abbe number of the glasses by changing the compositions concentration in the glasses. This work performed by LLNL under Contract DE-AC52-07NA27344 within the LDRD 19-ERD-020. LLNL-ABS-820516.
2:20 PM
Local Structural Effects on Divalent Europium in Glass Host Materials: Charles Bellows1; 1Alfred University
Many ionic lanthanides produce strong and distinctive luminescent properties. Typically, lanthanide dopants are present as trivalent ions which resist effects of the local environment of the host material; exhibiting a characteristic luminescent color regardless of the composition it is doped into. However, given a sufficiently reducing environment, select lanthanides can convert into a divalent state. These divalent ions are much more susceptible to ligand field effects; meaning, similar to transition metal color centers, divalent lanthanides may exhibit a wide variety of luminescent colors dependent upon composition of the host material. For example, whereas trivalent europium presents as a scarlet red luminescence; the divalent ion may range from anywhere along the visible spectrum from red to an aqua blue. Notably, compositions of soda lime silicates containing divalent europium were found to exhibit a brilliant “highlighter” yellow-green luminescence. Analysis of the shifts in luminescent wavelength was accomplished by fluorimetry and related spectroscopies.
2:40 PM
Optical Properties of One-dimensional Nb2O5 Nanostructures Prepared by Electrospinning: Tomasz Tanski1; Weronika Smok1; Marta Zaborowska1; 1Silesian University of Technology
In this work, electrospinning with subsequent heat treatment were employed to manufacture Nb2O5 nanowires. In the first step, using electrospinning from the solution of PVP and various weight concentrations of NbCl5, composite nanofibrous PVP/NbCl5 mats were obtained. As-spun mats were calcined in air at temperatures ranging from 400 to 600 °C to remove the polymer matrix and form pristine Nb2O5 nanowires. In order to study the morphology and structure of obtained nanostructures, a electron microscopes (SEM, TEM) were used. The chemical structure and composition were examined using Fourier-transform infrared spectroscopy (FTIR) and energy dispersive spectrometry (EDX), respectively. The polycrystalline structure of Nb2O5 nanowires was confirmed by X-Ray diffraction (XRD). The optical property analysis of manufactured nanomaterials was performed on the basis of UV–Vis spectra of absorbance as a function of the wavelength. The energy gap and the optical constants were determined on the basis of recorded spectra.