Site-selective excitation of Eu3+ substituted sodium β″ alumina single crystals
- 1 November 1988
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 89 (9) , 5377-5381
- https://doi.org/10.1063/1.455734
Abstract
Broad band excitation spectra of Eu3+ substituted sodium β‘ alumina reveals that the Eu3+ ions occupy at least two distinct sites. Examination of the fluorescence spectrum excited by an ultraviolet laser (308 nm) reveals the presence of an additional site. 5D0→7FJ emission spectra characteristic of each site were obtained using site‐selective excitation. A crystal‐field analysis of the emission spectra thus obtained permits the assignment of these sites. The two inhomogeneously broadened 5D0→7F0 emissions at 569.4 and 576.7 nm are assigned as mid oxygen sites perturbed by various arrangements of the residual sodium ions, while the sharp 5D0→7F0 emission at 578.7 nm is assigned as the Beevers–Ross site.Keywords
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