Influence of the Host Phase on the Vibrational Spectra of Europium‐Doped Zirconia Prepared by Hydrothermal Processing

Hemmer, Eva; Soga, Kohei; Konishi, Tomoya; Watanabe, Tomoaki; Taniguchi, Takaaki; Mathur, Sanjay

doi:10.1111/j.1551-2916.2010.03981.x

Cited by 16 publications

(7 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The trivalent europium ion Eu 3+ is an excellent model ion to probe the chemical environment around the Ln 3+ center by exploiting, for instance, the relative intensity and symmetry‐dependent Stark splitting of its hypersensitive 5 D 0 → 7 F 2 f–f transition . This allows for the correlation between the observed spectral features and the polymorph‐dependent variation in molecular arrangement.…”

Section: Resultsmentioning

confidence: 99%

“…7 F 2 f-f transition. [41][42][43][44][45] This allows for the correlation between the observed spectralf eatures and the polymorph-dependentv ariation in molecular arrangement. Moreover, using the hyperspectral single-crystal imaging technique, analysisofcrystal face-dependent PL becomes possible, probing opticala nisotropy at a single-crystal level.…”

Section: Opticalproperties:e Mission Spectroscopymentioning

confidence: 99%

See 1 more Smart Citation

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Errulat

Gabidullin

Murugesu

et al. 2018

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

Two homodinuclear and one heterodinuclear lanthanide (Ln)-based complexes of the general formula [Ln (bpm)(tfaa) ] (Ln=Eu (1), Tb (2), Eu-Tb (3), bpm=2,2'-bipyrimidine, tfaa =1,1,1-trifluoroacetylacetonate) were synthesized and characterized by single-crystal photoluminescence spectroscopy and hyperspectral imaging. Complexes 1 and 2 crystallize in two polymorphic structures, while three polymorphs were isolated for 3, namely having needle-, plate-, and block-like morphologies. Single-crystal photoluminescence spectroscopy and imaging on Eu -containing 1 and 3 revealed polymorph-dependent J-splitting of the hypersensitive D → F Eu transition as well as electric-to-magnetic dipole emission intensity ratios. According to these observations, the lowest symmetry chemical environment was attributed to the Eu ions present in the needle-like polymorph, also in agreement with single-crystal X-ray diffraction analysis. More importantly, hyperspectral imaging on all three single-crystal polymorphs of 3 exhibits optical anisotropy with photoluminescence enhancement at specific crystallographic faces. This behavior was ascribed to the distinct molecular packing of the Ln-Ln dimers in each polymorphic crystal as well as to face-specific local symmetry of the Eu centers. Overall, opto-structural relationships of three Ln-Ln dimers and their single-crystal polymorphs were established as a particularly promising avenue for control of photoluminescence by chemical crystal engineering.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Opticalproperties:e Mission Spectroscopymentioning

confidence: 99%

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Errulat

Gabidullin

Murugesu

et al. 2018

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

show abstract

“…ions, including the energy transfer from the host to the doping ion [15,16]. The intrinsic luminescence of the undoped zirconia materials has also been observed in different works though the origin of this emission is still basically an open question.…”

Section: Introductionmentioning

confidence: 97%

Structure–property relationship of luminescent zirconia nanomaterials obtained by sol–gel method

et al. 2014

View full text Add to dashboard Cite

Nanocrystalline ZrO 2 materials were prepared by sol-gel method combining different W = [H 2 O]/[ZTB] ratios (ZTB: zirconium tetrabutoxide) with 600, 800, and 1000°C annealing temperatures, yielding diverse phase compositions. A lower post-synthesis annealing temperature (600°C) favored the t-ZrO 2 tetragonal phase while higher temperatures (800 and 1000°C) yielded the monoclinic one (m-ZrO 2 ). Depending on the preparation conditions, mixed structure materials are readily obtained. The luminescence activator in the undoped ZrO 2 is assumed as trivalent titanium and emission bands are assigned to the 3d 1 (e g ) ? 3d 1 (t 2g ) transition. Due to weaker crystal field in m-ZrO 2 form, the Ti 3? emission band is red-shifted from 410 nm in t-ZrO 2 to 500 nm. The luminescence intensity of the t-ZrO 2 form is quenched at higher temperature than that of m-ZrO 2 , indicating higher activation energy and smaller Stokes shift. The undoped ZrO 2 excitation seems to involve photoionization of Ti 3? to Ti IV . Simultaneously, the freed electron is trapped to the oxygen vacancies (F ?? centers) created by Ti 3? /Ti IV charge compensation, so this can be considered as a metalto-host/ligand charge transfer. Since most of the excitation results in immediate emission, the traps are probably very shallow though deeper ones leads to the persistent luminescence from the undoped ZrO 2 .

show abstract

“…The excitation spectra were measured for the fluorescence at 613 nm of the europium-substituted lanthanum phosphates [18]. Samples prepared with P/(La + Eu) = 1 and 2 adsorbed at 250 -260 nm of excitation.…”

Section: Functional Properties Of Phosphate Materialsmentioning

confidence: 99%

Synthesis and Fluorescence Properties of Europium-Substituted Lanthanum Orthophosphate and Condensed Phosphates

Onoda¹,

Funamoto²

2012

AMPC

View full text Add to dashboard Cite

Mixtures of lanthanum oxide, europium oxide, and phosphoric acid were heated with various ratios of P/(La + Eu) and Eu/(La + Eu). The obtained phosphates were estimated using XRD patterns, FT-IR spectra, and SEM images. The fluorescence spectra and resistance against hydrofluoric acid were estimated as functional properties of these phosphate materials. The condensed phosphates showed a strong peak at 615 nm and high resistance against hydrofluoric acid.

show abstract

Influence of the Host Phase on the Vibrational Spectra of Europium‐Doped Zirconia Prepared by Hydrothermal Processing

Cited by 16 publications

References 46 publications

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Structure–property relationship of luminescent zirconia nanomaterials obtained by sol–gel method

Synthesis and Fluorescence Properties of Europium-Substituted Lanthanum Orthophosphate and Condensed Phosphates

Contact Info

Product

Resources

About

Influence of the Host Phase on the Vibrational Spectra of Europium‐Doped Zirconia Prepared by Hydrothermal Processing

Cited by 16 publications

References 46 publications

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln2] Complexes by Hyperspectral Imaging on Single Crystals

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln2] Complexes by Hyperspectral Imaging on Single Crystals

Structure–property relationship of luminescent zirconia nanomaterials obtained by sol–gel method

Synthesis and Fluorescence Properties of Europium-Substituted Lanthanum Orthophosphate and Condensed Phosphates

Contact Info

Product

Resources

About

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln₂] Complexes by Hyperspectral Imaging on Single Crystals