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

Autor(es)

Riul, Andre ^[1] ; da Fonseca, Fernando A. A. ^[1] ; Pugina, Roberta S. ^[1] ; Caiut, Jose Mauricio A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Quim, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Ribeirao Preto - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Luminescence; v. 233, MAY 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 16/11670-5 - NANOMATERIAIS e SISTEMAS LUMINESCENTES BASEADOS EM ÍONS TERRAS RARAS
• Beneficiário: José Maurício Almeida Caiut
• Modalidade de apoio: Auxílio à Pesquisa - Regular