Stabilization of pyrochlore phase of nanostructured Eu3+-doped Y2Sn2O7: A potential material for imaging via time-resolved luminescence analysis

resumo

This study reports the synthesis, structural, and spectroscopic characterization of Eu3+-doped yttrium stannate prepared by coprecipitation followed by thermal annealing at temperatures ranging from 700 to 1300 degrees C. All the samples contained pyrochlore Y2Sn2O7, and the crystallization degree increased with an increasing temperature. The Eu3+ emission spectra were used to follow the structural changes. For the sample annealed at 700 degrees C, inhomogeneous broadening resulted from Eu3+ distribution in a significantly disordered low-symmetry environment. As the annealing temperature increased, the spectral profile became sharper, and the band due to the 5 D 0 -> 7 F 1 transition stood out, revealing that Eu3+ occupied a centrosymmetric site (D3d). Site-selective excitation was observed through the 5 D 0 -> 7 F J (J = 0, 1, 2, 3, and 4) transitions under different excitation wavelengths. The samples exhibited potential for excitation in the green region (525 nm) and a long 5 D 0 excited state lifetime as the pyrochlore is stabilized. The outstanding results showed these materials have promising photonic applications, especially in imaging via time-resolved luminescence analysis.

palavras-chave

STRUCTURAL-CHARACTERIZATION; HYDROTHERMAL SYNTHESIS; OPTICAL-PROPERTIES; RARE; EMISSION; EU3+; PHOTOLUMINESCENCE; NANOCRYSTALS; TEMPERATURE; CRYSTAL

categoria

Chemistry; Materials Science; Metallurgy & Metallurgical Engineering

autores

Guidorzi, MV; Borges, FH; da Costa, AC; Fu, LS; Ferreira, RAS; Gonçalves, RR

Grupos

G2 - Materiais Fotónicos, Eletrónicos e Magnéticos

Projectos

Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)

CICECO - Aveiro Institute of Materials (UIDB/50011/2020)

CICECO - Aveiro Institute of Materials (UIDP/50011/2020)

Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)

agradecimentos

The authors acknowledge the Brazilian funding agencies FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo) , CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) , and CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior) and the project CICECO - Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020 & LA/P/0006/2020 financed by national funds through the FCT/MEC (PIDDAC) and when appropriate co-financed by FEDER under the PT2020 Partnership through European Regional Development Fund (ERDF) in the frame of Operational Competitiveness and Internationalization Programme (POCI) for financial support. MVG acknowledges CNPq for the scholarship process number 155872/2022-2. FHB acknowledges FAPESP for the scholarship process number 2023/13509-0;2020/00277-6. ACC acknowledges CNPq for the scholarship process number 124793/2023-1 and FAPESP 2024/05947-0. RRG acknowledges CNPq (grant number 303110/2019-8) , Programa Nacional de Apoio a Atencao Oncologica-PRONON (SIPAR Project #25000.077093/2015-86) , and FAPESP (grant number 2020/05319-9, 2017/11301-2 and 2021/08111-2) for financial support. We also would like to thank Mrs. Cynthia Maria de Campos Prado Manso for reviewing the text.