resumo
We report the synthesis of a Y3TaO7 solid solution containing a high Eu3+ concentration (from 7 up to 50 mol%) and investigate how Eu3+ influences the Y3TaO7 crystallization process. To this end, we evaluate the Y3TaO7 structural features and photoluminescence properties after Eu3+ introduction into the Y3TaO7 lattice. The higher the Eu3+ ion concentration, the more stable the crystallization process of the Y3TaO7 phase seems to be. The Eu3+-containing Y3TaO7 displays intense orange-reddish, broad band emission because Eu3+ occupies different symmetry sites in the host and causes inhomogeneous broadening. Eu3+ emission quenching due to Eu3+ concentration is negligible up to 30 mol% and absolute quantum yield values of up to nearly 30% were obtained, making Eu3+-containing Y3TaO7 interesting materials for application as high-intensity emitters in photonics.
palavras-chave
FLUORITE-RELATED PHASES; X-RAY-DIFFRACTION; RARE-EARTH; MAGNETIC-PROPERTIES; LUMINESCENCE PROPERTIES; OPTICAL-PROPERTIES; CRYSTAL-STRUCTURES; PHOTOLUMINESCENCE PROPERTIES; STRUCTURAL CHARACTERISTICS; RAMAN-SPECTROSCOPY
categoria
Chemistry
autores
Borges, FH; Caixeta, FJ; Pereira, RR; de Oliveira, SR; Ferreira, RAS; Goncalves, RR
nossos autores
Maria Rute de Amorim e Sá Ferreira André
Professor Catedráticoagradecimentos
The authors want to acknowledge Brazilian Funding Agencies FAPESP (grant number 2017/11301-2 and the scholarships processes numbers 2017/10424-3 and 2018/04587-0), CNPq and CAPES for financial support. This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. We also would like to thank Mrs Cynthia Maria de Campos Prado Manso for reviewing the text.