Relationship among morphology, photoluminescence emission, and photocatalytic activity of Eu-doped ceria nanostructures: A surface-type effect

Ortega, P.P.; Amoresi, Rafael Aparecido Ciola; Teodoro, M. D.; Longo, E.; Ponce, Miguel Adolfo; Simões, Alexandre Zirpoli

doi:10.1016/j.ceramint.2023.03.270

Cited by 10 publications

(1 citation statement)

References 89 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this work, we investigated how different synthesis temperatures influenced the morphology of europium-doped ceria (CeO 2 : 8 wt % Eu) nanostructures prepared using the MAH method. A doping concentration of 8 wt % was selected based on previous results, which indicated that at this concentration, several electronic and electrical properties of ceria, including its photocatalytic and gas sensing properties, , were improved without the formation of secondary phases. The morphological, structural, and optical properties were analyzed via X-ray diffractometry (XRD), Raman spectroscopy, absorption spectroscopy in the ultraviolet–visible region (UV–vis), photoluminescence emission spectroscopy (PL), transmission electron microscopy (TEM), and X-ray excited photoelectron spectroscopy (XPS).…”

Section: Introductionmentioning

confidence: 99%

Insights into the Morphology and Structural Defects of Eu-Doped Ceria Nanostructures for Optoelectronic Applications in Red-Emitting Devices

Ortega,

Amoresi,

Teodoro

et al. 2024

ACS Appl. Nano Mater.

Self Cite

View full text Add to dashboard Cite

In this work, we investigated the synthesis temperature effect on the crystal growth of Eu-doped ceria nanostructures synthesized via the microwave-assisted hydrothermal method and how it influences their red-light emission. Sphere-like nanoparticles, nanorods, nanorods/nanocubes, and nanocubes were obtained by gradually increasing the synthesis temperature. The structural analysis revealed that the nanocubes displayed higher crystallinity and lower structural disorder in comparison to the other morphologies. X-ray photoelectron spectroscopy (XPS) spectroscopy showed that oxygen vacancies were the predominant defect. The intensity of the photoluminescence emissions of the nanocubes was 60 times higher than that of the sphere-like nanoparticles and nanorods, indicating that the structural symmetry in this morphology is suitable for doping with Eu3+, displaying greater photoluminescence efficiency. The nanocubes also displayed excellent red-light emission, with coordinates (0.63,0.37) close to the red RGB primary at (0.64, 0.32). The lifetime values increased with higher synthesis temperatures. This trend suggests a structural correlation of different morphologies, defects, and homogeneity of the Eu3+ distribution in the crystal lattice and the photoluminescence emission and quenching. Therefore, we showed that controlling the morphology of Eu-doped CeO2 nanostructures is a powerful tool to improve its photoluminescence properties, which is valuable for applications as a red phosphor.

show abstract

Section: Introductionmentioning

confidence: 99%