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- W97130750 abstract "The aim of this study was to compare the spectra of absorption and luminescence of europium and cerium in the stable or metastable state in model sodium silicate glasses. The spectra of the optical transitions of electrons between the 4f states and the charge-transfer states at photorecharged (metastable) (Ce/sup 3 +/) ions are shifted approximately 0.6 eV toward lower energies by comparison with the spectra of stable Ce/sup 4 +/ ions. The spectra of the f-d absorption of the photorecharged (Ce/sup 4 +/)/sup /minus// and (Eu/sup 3 +/)/sup /minus// are shifted (0.01-0.15) eV toward lower energies relative to the spectra of the stable analogs Ce/sup 3 +/ and Eu/sup +/. Metastable (Ce/sup 4 +/)/sup /minus// and (Eu/sup 3 +/)/sup /minus//, unlike the analogs, do not luminesce on excitation. Trivalent europium has f-f luminescence characteristics in both stable (Eu/sup 2 +/) and metastable (Eu/sup 2 +/)/sup +/ states. In this case the luminescence spectra of the Eu/sup 3 +/ and the (Eu/sup 2 +/)/sup +/ ions are the same." @default.
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- W97130750 date "1988-05-01" @default.
- W97130750 modified "2023-09-23" @default.
- W97130750 title "Photorecharging of rare-earth ions in a glass and the metastable valence form of the activator" @default.
- W97130750 hasPublicationYear "1988" @default.
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