Sensitization and protection of Eu3+ luminescence by CeO2 in nano-composite

Yu, Yunlong; Chen, Daqin; Huang, Ping; Lin, Hang; Yang, Anping; Wang, Yuansheng

doi:10.1016/j.jallcom.2011.11.032

Cited by 12 publications

(8 citation statements)

References 20 publications

(24 reference statements)

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“…Without many quenching sites, the activator efficiently emits a desired color depending on the host and the activator materials. Red phosphors have generally been achieved by introducing Eu(III) activator ions into a host material . Eu(III) has a [Xe]4 f 6 electron configuration, and the emission of Eu(III) is generally associated with 5 D 0 → 7 F J ( J = 0,1,2,3,4) transitions, where the hypersensitive 5 D 0 → 7 F 2 transition emits red color .…”

Section: Introductionmentioning

confidence: 99%

“…CeO 2 was selected as a good model host material to study photoluminescence characteristics because it shows a good charge‐transfer absorption, has an oxidation pair (Ce 3+ /Ce 4+ ) that accepts/releases oxygen, and can demonstrate oxygen defects . Eu(III) has been loaded into CeO 2 host materials using hydrothermal, sol‐gel, solution combustion, and electrodeposition methods . Wang et al .…”

Section: Introductionmentioning

confidence: 99%

“…The broad emission was commonly attributed to oxygen vacancies . For Eu(III)‐doped CeO 2 , other studies have commonly reported that sharp 5 D 4 → 7 F J ( J = 6,5,4,3) emission transitions of Eu(III) occurred, and the photoluminescence was explained by the local site symmetry of doped Eu(III) . However, few studies of the Tb‐doped CeO 2 nanostructure have been conducted to date .…”

Section: Introductionmentioning

confidence: 99%

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2D‐ and 3D‐Photoluminescence Imaging of Eu(III) Embedded in CeO₂ Nanomatrix

Sohn

2013

J. Am. Ceram. Soc.

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2D-and 3D-photoluminescence characteristics of Eu(III) doped in CeO 2 nanoparticles were fully imaged for the first time. Their fundamental natures were also examined by scanning electron microscopy (SEM), X-ray diffraction (XRD) crystallography, and UV-visible absorption spectroscopy. The magnetic dipole 5 D 0 ? 7F 1 transition was dominated by an indirect transition associated with a O 2À -Ce 4+ charge-transfer band of CeO 2 . The electric dipole 5 D 0 ? 7 F 2 transition was dominated by a direct transition of Eu(III), indicating that Eu (III) replaces Ce(IV) at octahedral sites (O h and O) with and without an inversion center. Upon annealing, the photoluminescence intensity caused by direct transition was dramatically decreased, whereas that induced by indirect transition was greatly enhanced. These findings indicate that charge transfer to the Eu(III) at the octahedral (O h ) site with the inversion center is more efficient than that to the Eu(III) site without an inversion center. The absolute quantum yield for the 10 mol% Eu(III)-CeO 2 was found to be / = 0.007 at an excitation wavelength of 350 nm. The photoluminescence of Tb-doped CeO 2 was briefly discussed for comparison.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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2D‐ and 3D‐Photoluminescence Imaging of Eu(III) Embedded in CeO₂ Nanomatrix

Sohn

2013

J. Am. Ceram. Soc.

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“…Ce and Eu species are very popular as activators in different solid host lattices (single crystals, polycrystalline and glassy powders, ceramics) for producing multifunctional materials: as scintillators for neutron registration and X‐ray intensifying screens for medical purposes, as photosensitive materials for biomedical diagnostics, luminescence lamps, light‐emitting diodes, cathode ray tubes, etc. Previously we have reported on Ce, Cu, Eu, Mn and Ag species in tetraborate single crystals and silica .…”

Section: Introductionmentioning

confidence: 93%

Cerium and europium nanospecies in quartz glass: synthesis and spectral study

Ignatovych

Borysenko

Davydenko

et al. 2016

Materialwissenschaft Werkst

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Quartz glass doped with cerium (0.02–0.36 wt%) and europium (0.01–0.04 wt%) nanoparticles were prepared by a modified sol‐gel method. Ultraviolet‐visible optical absorption and steady‐state photoluminescence excitation‐emission techniques were applied for spectral characterization of samples. Absorption spectra for Ce/SiO2 samples showed two intense and broad bands of charge‐transfer (CT) character at 240 and 300 nm that were attributed to the O2– → Ce3+ and O2– → Ce4+ transitions, respectively. For Eu/SiO2 and CeEu/SiO2 samples, CT bands O2– → Eu3+ at 225 nm and non‐resolved ones O2– → Ce3+ at 245 nm were registered, respectively. Photoluminescence spectra of Ce/SiO2 samples showed the presence of Ce3+ ions emitting in the range of 413–438 nm caused by the 5d–4f transition. Photoluminescence spectra of Eu/SiO2 and CeEu/SiO2 samples featured the characteristic orange‐red emission arising from 5D0 → 7Fn manifolds (570–750 nm) of Eu3+ ions. The electric‐dipole 5D0 → 7F2 transition at 615 nm dominated in the Eu/SiO2 samples while the magnetic‐dipole transition 5D0 → 7F1 at 591 nm dominated in the CeEu/SiO2 double‐doped samples.

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“…To overcome the low absorptions of parity forbidden 4f-4f transitions of Ln 3+ , host sensitization via energy transfer (ET) from the excited host to the Ln 3+ ions provides an effective way to achieve highly efficient luminescence of Ln 3+ ions for practical applications [9][10][11]. Among various media for doping Ln 3+ ions, CeO 2 is regarded as one of the most suitable hosts for its high solubility, efficient sensitizing role for Ln 3+ activators [12][13][14][15]. The application potentiality in bioimaging and therapeutics of Ln 3+ doped CeO 2 is reported by Seal et al lately [16][17][18].…”

Section: Introductionmentioning

confidence: 99%