This paper describes and compares the local environments of Er3+ ions in pure SiO2, SiO2-Al2O3, SiO2-TiO2, and SiO2-HfO2, glasses, and in SiO2-HfO2 glass-ceramic waveguiding systems. This structural information is useful for selecting waveguides with optimised functional properties. This comparison has emphasised the peculiarity of the SiO2-HfO2 glass, in which the Er3+ ions are incorporated in HfO2-rich regions. By appropriate heat treatment, a transformation of SiO2-HfO2 system from glass to glass-ceramic occurs, where Er3+ remains incorporated in HfO2 nanocrystals as substituent of Hf4+. The spectroscopic interpretations are coherent with the present structural results.
Titolo: | Er3+-activated SiO2-based glasses and glass-ceramics: from structure to optimisation |
Autori: | N. D., Afify; Dalba, Giuseppe; F., Rocca; M., Ferrari |
Autori Unitn: | |
Titolo del periodico: | EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY. PART B, PHYSICS AND CHEMISTRY OF GLASSES |
Anno di pubblicazione: | 2007 |
Numero e parte del fascicolo: | 4 |
Handle: | http://hdl.handle.net/11572/90750 |
Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |