Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 521, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2019.119462
Keywords
Sm3+/Eu3+; Non-radiative energy transfer; Germanate-tellurite glass
Funding
- Consejo Nacional de Ciencia y Tecnologia CONACYT-Mexico [Infra-226208-2014, Infra-255791-2015]
- Catedra-CONACYT
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Sm3+/Eu3+ single doped and co-doped zinc-germanate-tellurite glasses were prepared by the glass melting method. Raman and optical spectroscopic properties of Sm3+, Eu3+ and Sm3+/Eu3+ doped TeO2-GeO2-ZnO glasses have been characterized through optical absorption and pulsed/steady fluorescence. Excitation and emission spectra measurements indicated that the energy transfer process Sm -> Eu is active in the samples. The concentration of europium ions was varied to provide red emission for possible control over the chromaticity tuning in the red-orange region. Upon 344 non excitation, the color of the global emission can be adjusted from orange of 2038 K to reddish-orange of 1683 K by increasing the Eu3+ content from 1 up to 2% mol, and co-doped with 0.5% mol Sm3+. Reddish-orange color purity very close to 100% is attained when the phosphors are excited at 406 nm. The time shortening of Sm3+ emission decay in the presence of Eu3+ was attributed to a Sm3+ -> Eu3+ non-radiative energy transfer process. From fitting the Sm3+ emission decay profile with the Inokuti-Hirayama model, it was inferred that the energy transfer process could be dominated by an electric dipole-dipole interaction.
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