Structural evolution of Er3+ ions in Li2O-Al2O3-SiO2 glass-ceramics

Abstract

Luminescence characteristics of Er3+ -doped Li2O-Al2O3-SiO2 (LAS) glass and glass-ceramic were evaluated by measuring their absorption spectra, fluorescence spectra and fluorescence lifetime. The absorption cross section of 4 I13/2 -4 I15/2 transition at 1.5 μm increased after cerammization. In contrast, fluorescence intensity of the 1.5 μm emission, fluorescence lifetime, τ f and the Quantum efficiency, η calculated from τ f and spontaneous emission probabilities decreased after cerammization. The decrease of τ f and η was attributed to the increase of the nonradiative decay rate, Wnr caused by accumulation of Er 3+ ions in the glass matrix containing OH ions by cerammization.

Spectroscopy and structural state of V4+ ions in lithium aluminosilicate glass and glass–ceramics

“…Notice that due to high intensity of absorption bands of tetrahedrally coordinated V 4+ ions even small amount of these polyhedrons can produce a pronounced spectrum, the absorption band in the range of 400-600 nm may be due to the absorption of V 4+ ions in tetrahedral coordination or VO 2+ ions with increasing degree of tetragonal distorted octahedrally coordinated. The similar result has also been discussed for the transparent Ni 2+ -doped lithium aluminosilicate glass-ceramics [14]. So, the overlapping of the signals for hyperfine structures of V 4+ in two kind states can be taken as main reason for nearly equal values of g and A for all the glass samples tested at room temperature.…”

“…The transition metal ions [1][2][3][4][5][6][7][8][9][10] such as Co, Cr, Ni, rare metal ions [11][12][13][14] such as Nd, Eu, Er have been studied in various glass system. It is widely recognized that the doping ions occupy either octahedral sites or tetrahedral sites in glasses and crystals, and the color of glasses are associated with the valence, structural state, and surrounding ligand field of the doping ions.…”

“…The LAS system glass implanted with chromium ions was also prepared and studied by EI-Diasty et al [6,7], the different oxidation states adopted by the chromium ions into the glass network were identified by the optical data, and the relationship between optical property and the composition of glass was also determined by the IR spectra. Additionally, some rare metal ions such as Eu, Er were also incorporated into LAS glassceramics and the optical absorption, fluorescence spectra were evaluated [13,14]. Dymshits and Zhinlin et al have carried out a series of studies about LAS glass system containing Co 2+ , Ni 2+ , and Nd 2+ in recent 30 years [2][3][4]11,12].…”

Glass‐Ceramics and Solid‐State Lighting

“…As there exist no cation sites for trivalent lanthanide in the LAS crystal, Er 3+ ions are condensed in the silicate matrix phase together with OH − impurity. Detail of this result is published on JCS Japan in 2008 …”

Phase Transformations upon Formation of Transparent Lithium Alumosilicate Glass-Ceramics Nucleated by Yttrium Niobates

“…A combination of unique thermal-mechanical properties of LAS glass-ceramics and their transparency with optical properties of rare-earth ions in oxide nanocrystals could allow for the development of new multifunctional materials. However, ionic radii of rare-earth ions are larger than those of ions that constitute the β-quartz ss, and there exist no cation sites for trivalent rare-earth ions in the LAS crystals [3]; β-quartz ss appeared to be a poor host for fluorescent cations [4].…”