Sonochemical Preparation and Characterization of Eu2O3 and Tb2O3 Doped in and Coated on Silica and Alumina Nanoparticles

Patra, Amitava; Sominska, Elena; Ramesh, Sivarajan; Koltypin, Yuri; Zhong, Ziyi; Minti, H.; Reisfeld, Renata; Gedanken, Aharon

doi:10.1021/jp984766l

Cited by 178 publications

(122 citation statements)

References 28 publications

(35 reference statements)

Supporting

Mentioning

113

Contrasting

Unclassified

Order By: Relevance

“…, which was blue shifted compared to previous results [38,42]. In Eu 3+ -doped CdS, the 5 D 0 → 7 F 1 transition is mainly magnetically allowed (magnetic-dipole transition).…”

Section: +contrasting

confidence: 68%

Rare earths (Ce, Eu) molar concentration-dependent of the structural and optical properties of CBD-CdS nanofilms

et al. 2018

View full text Add to dashboard Cite

It presents the characterization of rare earths (Eu,Ce)-doped CdS nanofilms that were synthesised by the growth technique chemical bath deposition (CBD) at the reservoir temperature of 70 ± 2• C. The doping of CdS with rare earths is performed by varying the synthesis time from 60 to 135 min. The rare earths molar concentration was range from 0.0 ≤ x ≤ 3.5, which was determined by energy dispersive X-ray spectroscopy. X-ray diffraction (XRD) analysis and Raman scattering reveal that CdS nanofilms showed the zinc blende (ZB) crystalline phase. The CdS average nanocrystal size was ranged from 1.84 to 2.67 nm that was determined by the Debye-Scherrer equation from ZB (111) direction, which was confirmed by transmission electron microscopy. Raman scattering shows that the lattice dynamics is characteristic of bimodal behaviour and the multipeaks adjust of the first optical longitudinal mode for the (Eu,Ce)-doped CdS, which denotes the Raman shift of the characteristic peak about 305 cm −1 of the CdS nanocrystals. The CdS nanofilms exhibit a direct bandgap that slightly decreases with increasing doping, from 2.50 to 2.42 eV, which was obtained by room temperature transmittance. The room-temperature photoluminescence of CdS shows the band-to-band transition at 2.88 eV, which is associated to quantum confinement and a dominant radiative band at 2.37 eV that is called the optical signature of interstitial oxygen. The Eu 3+ -doped CdS photoluminescence shows the dominant radiative band at 2.15 eV, which is associated to the intra-4f radiative transition of Eu 3+ ions that corresponds to the magnetic dipole transition, ( 5 D0→ 7 F 1 ).For the Ce 3+ -doped CdS the dominant radiative transition, at 2.06 eV, is clearly redshifted, although the passivation of the CdS nanofilms byCe was approximately by a factor about 21 for the best results.Keywords: CdS; Chemical bath deposition; Rare earths; cerium; europium.Se presenta la caracterización de las nanopelículas de CdS impurificadas con tierras raras (Eu,Ce) que se sintetizaron mediante la técnica de crecimiento deposición de baño químico (CBD) a la temperatura del reservorio de 70 ± 2 • C. La impurificación de CdS con tierras raras se realizó variando el tiempo de síntesis de 60 a 135 min. La concentración molar de las tierras raras fue de 0.0 ≤ x ≤ 3.5, que se determinó mediante espectroscopia de rayos X de energía dispersiva. El análisis de difracción de rayos X (XRD) y dispersión de Raman revelan que las nanopelículas de CdS mostraron la fase cristalina de zinc blenda (ZB). El tamaño medio de los nanocristales de CdS varió de 1.84 a 2.67 nm, que se determinó mediante la ecuación de Debye-Scherrer a partir de la dirección ZB (111), que se confirmó mediante microscopía electrónica de transmisión. La dispersión Raman muestra que la dinámica de la red es característica del comportamiento bimodal y el ajuste multipicos del primer modo longitudinalóptico para el CdS impurificado con (Eu, Ce), el cual denota el desplazamiento Raman del pico característico en aproximadamente 305 ...

show abstract

“…, which was blue shifted compared to previous results [38,42]. In Eu 3+ -doped CdS, the 5 D 0 → 7 F 1 transition is mainly magnetically allowed (magnetic-dipole transition).…”

Section: +contrasting

confidence: 68%

Rare earths (Ce, Eu) molar concentration-dependent of the structural and optical properties of CBD-CdS nanofilms

et al. 2018

View full text Add to dashboard Cite

show abstract

“…It is evident that the highest phonon frequencies of the host lattice are responsible for nonradiative relaxation in the luminescence of rare-earth ions. [40] In accordance with the energy law, the presence of a large gap between the emitting and terminal levels reduces the probability of nonradiative decay. Therefore, lower host phonon energy has a greater number of phonons connecting the emitting level with the next lower level.…”

Section: Introductionmentioning

confidence: 87%

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

2014

View full text Add to dashboard Cite

The fundamental understanding of lanthanide-doped upconverted nanocrystals remains a frontier area of research because of potential applications in photonics and biophotonics. Recent studies have revealed that upconversion luminescence dynamics depend on host crystal structure, size of the nanocrystals, dopant concentration, and core-shell structures, which influence site symmetry and the distribution and energy migration of the dopant ions. In this review, we bring to light the influences of doping/co-doping concentration, crystal phase, crystal size of the host, and core-shell structure on the efficiency of upconversion emission. Furthermore, the lattice strain, due to a change in the crystal phase and by the core-shell structure, strongly influences the upconversion emission intensity. Analysis suggests that the local environment of the ion plays the most significant role in modification of radiative and nonradiative relaxation mechanisms of overall upconversion emission properties. Finally, an outlook on the prospects of this research field is given.

show abstract

“…2 Eu 2 O 3 nanoparticles have been prepared by means of laser evaporation, 3 sol-gel, 4 and colloidal chemistry. 5 So far, some synthetic methods of 1D Eu 2 O 3 nanostructures have been published.…”

Section: Introductionmentioning

confidence: 99%

Formation of Eu₂O₃ Nanorods through Solvothermal Routes by Surfactant Assistance

et al. 2008

View full text Add to dashboard Cite

Eu 2 O 3 nanorods were synthesized and characterized. The crystallites of Eu 2 O(CO 3 ) 2 •H 2 O nanorods and Eu 2 O 3 nanorods were obtained by means of surfactant assistance, with aqueous butanol solution as the solvent and hexamethylene tetramine as the base. The characteristics of the nanorods were analyzed by transmission electron microscopy, high-resolution transmission electron microscopy, scanning electron microscopy and X-ray diffraction. The Eu 2 O 3 nanorod is about 80-300 nm in diameter and 1-5 µm in length. The formation mechanism of the 1D products was also proposed.

show abstract

Sonochemical Preparation and Characterization of Eu₂O₃ and Tb₂O₃ Doped in and Coated on Silica and Alumina Nanoparticles

Cited by 178 publications

References 28 publications

Rare earths (Ce, Eu) molar concentration-dependent of the structural and optical properties of CBD-CdS nanofilms

Rare earths (Ce, Eu) molar concentration-dependent of the structural and optical properties of CBD-CdS nanofilms

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

Formation of Eu₂O₃ Nanorods through Solvothermal Routes by Surfactant Assistance

Contact Info

Product

Resources

About

Sonochemical Preparation and Characterization of Eu2O3 and Tb2O3 Doped in and Coated on Silica and Alumina Nanoparticles

Cited by 178 publications

References 28 publications

Rare earths (Ce, Eu) molar concentration-dependent of the structural and optical properties of CBD-CdS nanofilms

Rare earths (Ce, Eu) molar concentration-dependent of the structural and optical properties of CBD-CdS nanofilms

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

Formation of Eu2O3 Nanorods through Solvothermal Routes by Surfactant Assistance

Contact Info

Product

Resources

About

Sonochemical Preparation and Characterization of Eu₂O₃ and Tb₂O₃ Doped in and Coated on Silica and Alumina Nanoparticles

Formation of Eu₂O₃ Nanorods through Solvothermal Routes by Surfactant Assistance