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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tuned structure of europium-doped Al2O3-ytrium luminescent composites and their spectroscopic behavior

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Author(s):
Riul, Andre [1] ; da Fonseca, Fernando A. A. [1] ; Pugina, Roberta S. [1] ; Caiut, Jose Mauricio A. [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Dept Quim, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Ribeirao Preto - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Luminescence; v. 233, MAY 2021.
Web of Science Citations: 0
Abstract

This work proposes a smart way to produce lanthanide-doped alumina and yttrium spherical compounds. We were able to tune the structure of the Al2O3-yttrium binary material prepared herein by controlling the Y3+/Al3+ ratio. Small ratio (Y-0.1/Al-1 mol/mol) afforded the metastable hexagonal phase (YAlO3), which remained stable in the final product even after thermal treatment at 1100 degrees C. On the basis of XRD data, increasing Y3+/Al3+ ratio led to the formation of the crystalline YAG phase after thermal treatment. The luminescence data showed that Eu3+ ions doped into the binary material were highly sensitive to changes in the environment around the Eu3+ ion, and the emission spectra corroborated that the latter ion migrated to yttrium sites in the YAG structure. The luminescence confirmed the presence of a secondary Eu3+ ion coordination site in the material, but at higher Y3+/Al3+ ratio, the YAG structure has predominated. (AU)

FAPESP's process: 16/11670-5 - NANOMATERIALS AND LUMINESCENT SYSTEMS BASED ON RARE EARTH IONS
Grantee:José Maurício Almeida Caiut
Support Opportunities: Regular Research Grants