Polyol synthesis and characterizations of cubic ZrO2:Eu3+ nanocrystals

Meetei, Sanoujam Dhiren; Singh, S. Dorendrajit; Sudarsan, V.

doi:10.1016/j.jallcom.2011.11.051

Cited by 40 publications

(29 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is to note that the IEP was slightly under the range between 4 to 11, usually reported in the literature for different zirconia materials. These precipitates are amorphous to the X-ray powder diffraction but as 18 reported before seems to be make up by an inner crystalline nucleus and an outer amorphous coating. Fig.…”

Section: Dispersability Of V-zro 2 Solid Solution Nanoparticlessupporting

confidence: 56%

V-containing ZrO₂ inorganic yellow nano-pigments

2015

View full text Add to dashboard Cite

In this work we report new results on the preparation, characterization and color properties of the inorganic yellow nano-pigmenting system based on monoclinic V-ZrO 2 solid solution nanoparticles. The series of solid solution nanopowders were obtained by a polyol technique where the precipitates, obtained after heating at 180 ºC ethylenglycol solutions of vanadyl acetonate and zirconium n-propoxide, were annealed at different temperatures up to 1300 ºC for short duration, in order to improve their crystallinity and control the crystalline form of the final nanoparticles. On annealing at around 450 ºC high crystalline tetragonal V-containing zirconia particles were developed, which transform into the monoclinic form of the V-ZrO 2 solid solution after subsequent annealing at 800 ºC. Interestingly, the final non-aggregated, well-shaped monoclinic zirconia solid solution particles heated even at as high temperatures as 1000 ºC, were sized in the nanometric range displaying well-defined faces and edges. The chromatic coordinates of the prepared nano-pigments after annealing at different temperatures between 800 and 1300 ºC indicated yellowness values comparable to conventionally prepared micrometric yellow pigments. The stability of the nanopigments in aqueous dispersions estimated by zeta potential measurements was good with a low degree of particles´ aggregation. The used polyol-mediated synthesis can be up-scaled on an industrial level in the preparation of zirconia-based nano-pigmenting systems.19 characteristics allow using the polyol approach as a suitable way of industrial manufacture of nano-pigments.From the results obtained in this specific pigmenting ceramic system it can be inferred that the polyol approach can be applied for the preparation of other widely used micrometric ceramic pigmenting systems in the nanometric scale with a good control of the three main characteristics of particles, i. e., size, degree of agglomeration and phase composition.

show abstract

Section: Dispersability Of V-zro 2 Solid Solution Nanoparticlessupporting

confidence: 56%

V-containing ZrO₂ inorganic yellow nano-pigments

2015

View full text Add to dashboard Cite

show abstract

“…[7][8][9] In addition, the crystal lattice tends to transform into a structure with high symmetry as crystallite size decreases, owing to the lower free surface energy of the tetragonal or cubic phase than the monoclinic phase. [7][8][9][10][11][12] It is reported that the incorporation of trivalent rare-earth ions such as Y 3+ + , 10 Pr 3+ , 11 and Eu 3+ 12 results in cubic or tetragonal phase of ZrO 2 at room temperature. The inclusion of trivalent cation introduces oxygen deficiencies that stabilize the tetragonal or cubic phase.…”

Section: Introductionmentioning

confidence: 99%

“…13 The techniques employed to study the optical properties of lanthanide ion-doped ZrO 2 materials include cathodoluminescence, photoluminescence, and thermoluminescence spectroscopies. The reported results of the optical studies include the photoluminescence of solgel-derived ZrO 2 nanophosphors doped with Pr 3+ , 11 Eu 3+ , 12 Sm 3+ , 13 Er 3+ , 14 Ce 3+ , 15 and Dy 3+ 16 systems. Few reports have been devoted to the physical understanding of the relationship between the luminescence properties of the dysprosium and europium centers and structural modifications of zirconia, focusing on information about the chemical environment of Dy 3+ and Eu 3+ ions.…”

Section: Introductionmentioning

confidence: 99%

Structural and Optical Properties of Tunable Warm‐White Light‐Emitting ZrO₂:Dy³⁺–Eu³⁺ Nanocrystals

Das

Yang

2013

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

A series of Dy3+–Eu3+‐codoped ZrO2 nanocrystals with tetragonal and cubic symmetry was synthesized via a wet chemical reaction. When the Eu3+‐doping content was fixed, the crystal structure could be stabilized from the mixed phase to single cubic phase by simply adjusting the content of Dy3+. The cubic ZrO2:Dy3+–Eu3+ nanoparticles exhibited spherical and nonagglomerated morphology. The effective phonon energy of cubic ZrO2:5%Dy3+–5%Eu3+ was calculated to be 445 cm−1, which is lower than the previously reported results. Extensive luminescence studies of ZrO2:Dy3+–Eu3+ as a function of Dy3+ content demonstrated that the dopant concentration and its site symmetry play an important role in the emissive properties. Under 352 nm excitation, the increment of Dy3+ concentration in ZrO2:Dy3+–Eu3+ led to an increase in orange (590 nm) and red (610 nm) emissions of Eu3+ ions, which are attributed to the 5D0→7FJ(J = 1, 2) transitions of Eu3+ ions. This increment is possibly due to the efficient energy transfer (ET) 4F9/2:Dy3+→5D0:Eu3+. The phosphors can generates light from yellow through near white and eventually to warm white by properly tuning the concentration of Dy3+ ions through the ET and change in site symmetry. These phosphors may be promising as warm‐white‐/yellow‐emitting phosphors.

show abstract

“…The autoreduction of zirconium ion species with the generation of oxygen vacancies may explain the formation of the tetragonal phase of the microemulsion-derived ZrO 2 precursors at room temperature [3,24]. However, oxygen vacancies may also be introduced by the incorporation of trivalent Ce 3+ ions [4,25].…”

Section: Resultsmentioning

confidence: 99%

“…Further annealing of ZrO 2 precursors in the reduction furnace accelerated the tetragonal-to-monoclinic phase transformation from 700°C to 900°C. During heat treatment, the penetrating OH groups became O 2− and subsequently reduced the oxygen vacancies that were responsible for the formation of the tetragonal phase [3,24,25]. XRD measurements were made to elucidate the effects of Ce 3+ concentration on the structure and crystallinity of ZrO 2 .…”

Section: Resultsmentioning

confidence: 99%