Warm white light emitting ThO2:Sm3+ nanorods: Cationic surfactant assisted reverse micellar synthesis and Photoluminescence properties

Gupta, Santosh K.; Gupta, Ruma; Natarajan, V.; Godbole, S.V.

doi:10.1016/j.materresbull.2013.09.010

Cited by 29 publications

(9 citation statements)

References 32 publications

(32 reference statements)

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“…Metal oxide nanoparticles show interesting changes in their optical, magnetic, electrical, and catalytic properties accompanied by improved physical properties like mechanical hardness, thermal stability, or chemical passivity . Since the rapid advances in nanosciences and nanotechnologies, particularly the development of new methods for materials synthesis, there has been growing interest in studying the optical behavior of rare‐earth (RE) ions in nanomaterials . The RE‐doped inorganic nanophosphor is one of the most promising materials for a variety of applications in solid‐state lasers, lighting, and displays, and biolabels …”

Section: Introductionmentioning

confidence: 99%

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Probing Site Symmetry Around Eu³⁺ in Nanocrystalline ThO₂ Using Time Resolved Emission Spectroscopy

et al. 2014

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ThO 2 :Eu 3+ nanoparticles were synthesized at 300°C by combustion route using urea as a fuel and characterized by thermogravimetric/differential thermal analysis, X-ray diffraction, transmission electron microscopy, and photoluminescence techniques. To investigate the effect of annealing temperature, as synthesized powder were heated further at 500°C, 700°C, and 900°C. It was observed that extent of asymmetry around Eu 3+ at 700°C/900°C is very high as compared to as-prepared or 500°C annealed sample. Based on the time resolved emission spectroscopic investigations, it was inferred that two different types of Eu 3+ ions were present in the ThO 2 nanoparticles. In ThO 2 structure, Eu 3+ ions occupy two sites; cubic (O h ) and noncubic (

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Section: Introductionmentioning

confidence: 99%

“…Reports are available on luminescence properties of ThO 2 activated with rare‐earth ions, such as Pr, Sm, Dy, Tb, Er . As far as europium as a dopant ion in thoria is concerned, some reports do exist in literature .…”

Section: Introductionmentioning

confidence: 99%

Probing Site Symmetry Around Eu³⁺ in Nanocrystalline ThO₂ Using Time Resolved Emission Spectroscopy

et al. 2014

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“…Although thoria has been associated with mild radioactivity and higher costs, careful handling of rare‐earth doped thoria systems would be outweighing its limitations especially in diagnostic and therapeutic biological applications . Although singly rare‐earth ion–doped thoria systems have been investigated from the point of view of luminescent materials and for understanding the complex defect chemistry present in them, answers to certain questions have not been reached yet . For example, concentration of LnO 1.5 that could be dissolved in thoria lattice has been found to vary with the mode of synthesis .…”

Section: Introductionmentioning

confidence: 99%

Optical property evaluation of thoria doped with heavier rare‐earth oxides LnO_1.5 (Ln = Er³⁺, Ho³⁺, Tm³⁺, and Yb³⁺)

et al. 2018

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To address the existing gap in the literature of upconversion studies involving thoria, samples of thoria doped with Ho3+‐Yb3+, Er3+‐Yb3+, and Tm3+‐Yb3+ were synthesized following epoxide gel method and were characterized. Fluorite structure of the doped samples was evident for the calcined samples from the corresponding xerogels as noticed in their powder X‐ray diffraction patterns. The presence of a sharp band near 460 cm−1 in the Raman spectra of all these samples supported the results from diffraction experiments. Intraconfigurational f‐f transitions of Ho3+, Er3+, and Tm3+ were present in the UV‐visible absorbance spectra of these samples. Both normal emission and upconversion emission from these samples have been studied. Emissions in all three basic colors were observed in the upconversion emission spectra. Two‐photon process was found to be responsible for the upconversion in these systems. Decay time measurements for these emissions were analyzed. This synthetic process was further extended to determine the extent of dissolution of heavier lanthanides and found that up to 50 mol% of Ho3+, Er3+ and 60 mol% of Tm3+, Yb3+ could be dissolved retaining fluorite structure. Creation of oxygen vacancies for these heavily doped specimens was quite encouraging and it could be useful as solid electrolytes in fuel cells.

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“…[1][2][3][4] Its high melting point, high corrosion resistivity, lower thermal expansion and higher thermal conductivity permit it to be useful for applications under high-temperature conditions. 5,6 Other than intense research on luminescent properties of thoria doped with rare-earth cations, [7][8][9][10][11][12][13][14][15][16] generation of oxygen vacancy defects through the addition of lower valent cations for the primary use as oxygen storage capacitor (OSC) in solid oxide fuel cells (SOFC) is of current interest. [17][18][19][20][21][22][23] The recent work of Clavier's group deserves a mention where yttrium-doped thoria compositions have been demonstrated for oxygen sensor applications.…”

Section: Introductionmentioning

confidence: 99%

Emergence of defect fluorite structure in nano‐sized thoria through doping with some divalent transition‐metal ions

2017

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With the objective of incorporating some divalent transition‐metal ions in thoria and to comprehend its effect on the crystal structure, electronic as well as catalytic properties, Ni2+, Cu2+ and Cd2+ substituted thoria samples were synthesized by the epoxide gel method. Of the two concentrations investigated, 10 mol% of Ni2+, Cu2+, and Cd2+ could be substituted retaining the fluorite structure and phase separation into individual oxides was noticed for 15 mol%. The average crystallite size of thoria and 10 mol% substituted samples was 14 nm. Le‐Bail structural refinements of Powder X‐ray diffraction (PXRD) patterns indicated marginal increase in unit cell constant for the Cd2+ substituted sample and a decrease for Ni2+ and Cu2+ substituted samples. In addition to broadening of the band at around 460 cm−1 (F2g vibration of the fluorite), less intense band near 560‐590 cm−1 emerged for all the transition‐metal ion‐containing samples in the Raman spectra implying the formation of oxygen defects. The absorption edge in the UV‐visible spectra moved toward higher wavelength for Cd2+, Ni2+ and Cu2+ containing samples as compared to pure thoria. In addition, d‐d transition was observable for Ni2+ and Cu2+ containing samples. By virtue of these changes in the electronic structure of transition‐metal ion‐containing samples, they were examined as catalysts for the degradation of aqueous Rhodamine‐6G (Rh‐6G) dye solutions under visible radiation.

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Warm white light emitting ThO2:Sm3+ nanorods: Cationic surfactant assisted reverse micellar synthesis and Photoluminescence properties

Cited by 29 publications

References 32 publications

Probing Site Symmetry Around Eu³⁺ in Nanocrystalline ThO₂ Using Time Resolved Emission Spectroscopy

Probing Site Symmetry Around Eu³⁺ in Nanocrystalline ThO₂ Using Time Resolved Emission Spectroscopy

Optical property evaluation of thoria doped with heavier rare‐earth oxides LnO_1.5 (Ln = Er³⁺, Ho³⁺, Tm³⁺, and Yb³⁺)

Emergence of defect fluorite structure in nano‐sized thoria through doping with some divalent transition‐metal ions

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Warm white light emitting ThO2:Sm3+ nanorods: Cationic surfactant assisted reverse micellar synthesis and Photoluminescence properties

Cited by 29 publications

References 32 publications

Probing Site Symmetry Around Eu3+ in Nanocrystalline ThO2 Using Time Resolved Emission Spectroscopy

Probing Site Symmetry Around Eu3+ in Nanocrystalline ThO2 Using Time Resolved Emission Spectroscopy

Optical property evaluation of thoria doped with heavier rare‐earth oxides LnO1.5 (Ln = Er3+, Ho3+, Tm3+, and Yb3+)

Emergence of defect fluorite structure in nano‐sized thoria through doping with some divalent transition‐metal ions

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Probing Site Symmetry Around Eu³⁺ in Nanocrystalline ThO₂ Using Time Resolved Emission Spectroscopy

Probing Site Symmetry Around Eu³⁺ in Nanocrystalline ThO₂ Using Time Resolved Emission Spectroscopy

Optical property evaluation of thoria doped with heavier rare‐earth oxides LnO_1.5 (Ln = Er³⁺, Ho³⁺, Tm³⁺, and Yb³⁺)