| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Glasses and Optical Materials: Current Issues and Functional Applications
|
| Presentation Title |
D-17: Sulfur Blue Glasses - S<sub>3</sub><sup>-</sup> Anion Charge Transfer Transitions |
| Author(s) |
Lucas Greiner , Jacob Kaspryk, Doris Möncke |
| On-Site Speaker (Planned) |
Jacob Kaspryk |
| Abstract Scope |
Ultramarine, the intense anion-to-anion charge transfer transitions within a sulfur cluster, gives Lapis Lazuli its typical deep blue color. In ancient times “lapis lazuli from the fire” refers to cobalt blue silicate glasses, however, low basicity phosphate and borate glasses may also stabilize sulfur clusters. Focusing first on phosphate glasses, we looked for low basicity compositions with high field strength cations in order to identify a chemically stable composition that shows the blue color of these S<sub>3</sub><sup>-</sup> clusters. UV-Vis-NIR spectroscopy shows the typical absorption band with a maximum at 578 nm, Photoluminescence spectra saw a red fluorescence with an emission maximum near 666 nm when excited at 420 nm. The extra electron of the S<sub>3</sub><sup>-</sup> clusters was also confirmed by Paramagnetic Resonance (EPR) spectroscopy. |