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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
Link between optical spectra, crystal-field parameters, and local environments of Eu3
+
ions in Eu
2
O
3
-doped sodium disilicate glass
Physical Review B - Condensed Matter and Materials Physics, Volume 84, No. 10, Article 104206, Year 2011
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Description
Rare-earth-doped glasses are key materials for optical technology due to the luminescent properties of 4fn ions. The crystal-field model describes the effect of local environment on transitions between 4f electrons. We present a detailed modeling study of the optical spectra of sodium disilicate glass, 33Na2O•67SiO2, doped with 0.2% and 1.0 mol% Eu 2O3. This study uses very large molecular dynamics models with up to 100 Eu3+ ions, the superposition model for covalent and overlap effects on crystal-field parameters, and realistic values for homogeneous linewidth broadening. The simulated spectra are in reasonable agreement with experiment. The trends in 7FJ energy levels across different Eu3+ ion sites have been examined and a very detailed analysis is presented that looks at how features of the spectra are related to features of the local environment of Eu3+ ions. Increasing the crystal-field strength Stotal causes the 7F0 energy level to decrease and causes the splitting of 7FJ manifolds to increase, and this is due to increasing mixing of 4f wave functions. To a reasonable approximation the crystal-field strength components Sk depend on angular positions of ligands independently of distances to ligands. The former are seen to be more significant in determining Sk, which are closely related to the rotationally invariant bond-orientational order parameters Q k. The values of S2 are approximately linear in Q 2, and the values of Q2 are higher for fivefold than sixfold coordinated rare-earth ions. These results can be of importance for efforts to enhance the local environment of rare-earth ions in oxide glasses for optical applications. © 2011 American Physical Society.
Authors & Co-Authors
Qin, T.
United Kingdom, Canterbury
University of Kent
United Kingdom, Uxbridge
Brunel Centre for Advanced Solidification Technology
Mountjoy, Gavin
United Kingdom, Canterbury
University of Kent
Afify, Nasser A.
United Kingdom, Canterbury
University of Kent
Switzerland, Ruschlikon
Ibm Research - Zurich
Egypt, Giza
Egypt Nanotechnology Research Center
Reid, M. F.
New Zealand, Christchurch
University of Canterbury
Yeung, Y. Y.
China, Hong Kong
The Education University of Hong Kong
Speghini, Adolfo
Italy, Verona
Università Degli Studi Di Verona
Bettinelli, Marco
Italy, Verona
Università Degli Studi Di Verona
Statistics
Citations: 20
Authors: 7
Affiliations: 7
Identifiers
Doi:
10.1103/PhysRevB.84.104206
ISSN:
10980121
e-ISSN:
1550235X
Study Approach
Quantitative