One-step synthesis and morphology evolution of luminescent Eu2+ doped strontium aluminate nanostructures

Si, Dajie; Geng, Bo; Wang, Shaozhen

doi:10.1039/b921613h

Cited by 22 publications

(12 citation statements)

References 22 publications

(14 reference statements)

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“…X-ray photoelectron spectroscopy (XPS) data from different stages of the functionalization process are presented in Figure 4 . Spectra of unencapsulated milled phosphors are similar to those previously reported for strontium aluminate, 35 with Sr 3s, 3p 3/2 , and 3d peaks at 359.6, 270.8, and 135.6 eV and Al 2s and 2p peaks at 119.6 and 74.8 eV, respectively. The peak at 286 eV is predominately C 1s with contributions from the adjacent Sr 3p 1/2 peak at 280.8 eV.…”

Section: Resultssupporting

confidence: 83%

Persistent Luminescence Strontium Aluminate Nanoparticles as Reporters in Lateral Flow Assays

et al. 2014

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Demand for highly sensitive, robust diagnostics and environmental monitoring methods has led to extensive research in improving reporter technologies. Inorganic phosphorescent materials exhibiting persistent luminescence are commonly found in electroluminescent displays and glowing paints but are not widely used as reporters in diagnostic assays. Persistent luminescence nanoparticles (PLNPs) offer advantages over conventional photoluminescent probes, including the potential for enhanced sensitivity by collecting time-resolved measurements or images with decreased background autofluorescence while eliminating the need for expensive optical hardware, superior resistance to photobleaching, amenability to quantitation, and facile bioconjugation schemes. We isolated rare-earth doped strontium aluminate PLNPs from larger-particle commercial materials by wet milling and differential sedimentation and water-stabilized the particles by silica encapsulation using a modified Stöber process. Surface treatment with aldehyde silane followed by reductive amination with heterobifunctional amine-poly(ethylene glycol)-carboxyl allowed covalent attachment of proteins to the particles using standard carbodiimide chemistry. NeutrAvidin PLNPs were used in lateral flow assays (LFAs) with biotinylated lysozyme as a model analyte in buffer and monoclonal anti-lysozyme HyHEL-5 antibodies at the test line. Preliminary experiments revealed a limit of detection below 100 pg/mL using the NeutrAvidin PLNPs, which was approximately an order of magnitude more sensitive than colloidal gold.

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Section: Resultssupporting

confidence: 83%

Persistent Luminescence Strontium Aluminate Nanoparticles as Reporters in Lateral Flow Assays

et al. 2014

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“…The authors attributed this observation to an X‐ray radiation induced oxidation process, proven by the photoluminescence, which only displays the characteristic 4f 6 5d 1 →4f 7 transition of the Eu 2+ cations. Sr 3 Al 2 O 6 :Eu 2+ , in contrast, only exhibits the characteristic divalent Eu peaks (Eu 2+ 3d 5/2 1125.5 eV, Eu 2+ 3d 3/2 1157.3 eV) . The missing Eu 3+ of the oxidized species might be explained in this case by the rigid oxide lattice.…”

Section: Resultsmentioning

confidence: 91%

“…Sr 3 Al 2 O 6 :Eu 2 + ,i nc ontrast, only exhibits the characteristicd ivalent Eu peaks (Eu 2 + 3d 5/2 1125.5 eV,E u 2 + 3d 3/2 1157.3 eV). [109] The missing Eu 3 + of the oxidized species might be explained in this case by the rigid oxide lattice. Figure 11.T here is no gap at the Fermi level, consistent with the small electrical resistivity.T he majority spin states of Eu 4f are all occupied, while its minority spin states are all unoccupied, indicating ah igh spin f 7 (Eu 2 + ) configuration.…”

Section: Eu Mçssbauer Spectroscopic Investigationsmentioning

confidence: 99%

From 3D to 2D: Structural, Spectroscopic and Theoretical Investigations of the Dimensionality Reduction in the [PtAl₂]^δ− Polyanions of the Isotypic MPtAl₂ Series (M=Ca–Ba, Eu)

Stegemann

Block

Klenner

et al. 2019

Chemistry A European J

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Four new MPtAl2 (M=Ca, Sr, Ba, Eu) compounds, adopting the orthorhombic MgCuAl2‐type structure, have been synthesized from the elements using tantalum ampoules. All compounds are obtained as platelet‐shaped crystallites and exhibit an increasing moisture sensitivity with increasing size of the formal M cation. Structural investigations indicate a pronounced elongation of the crystallographic b‐axis, which results in a significant distortion of the [PtAl2]δ− polyanion. Within the polyanion, layer‐like arrangements can be found with bonding Pt−Al interactions within the slab; the increase of the b‐axis can be attributed to increasing Al−Al distances and therefore decreasing interactions between the slabs, caused by the differently‐sized formal M cations. While the alkaline earth (M=Ca, Sr) representatives exhibit Pauli paramagnetism, BaPtAl2 shows diamagnetic behavior, finally EuPtAl2 is ferromagnetic with TC=54.0(5) K. The effective magnetic moment indicates that the Eu atoms are in a divalent oxidation state, which is confirmed by 151Eu Mössbauer spectroscopic investigations. Measurements below the Curie‐temperature show a full magnetic hyperfine field splitting with Bhf=21.7(1) T. 27Al and 195Pt magic‐angle spinning NMR spectroscopy corroborates the presence of single crystallographic sites for the Pt and Al atoms. The large 27Al nuclear electric quadrupolar coupling constants confirm unusually strong electric field gradients, in agreement with the structural distortions and the respective theoretical calculations. X‐ray photoelectron spectroscopy has been utilized to investigate the charge transfer within the polyanion. The Pt 4f binding energy decreases with decreasing electronegativity / ionization energy of the alkaline earth elements, suggesting an increasing electron density at the Pt atoms. Theoretical investigations underline the platinide character of the investigated compounds by Bader charge calculations. The analysis of the integrated crystal orbital Hamilton population (ICOHP) values, electron localization function (ELF) and isosurface analyses lead to a consistent structural picture, indicating stable layer‐like arrangements of the [PtAl2]δ− polyanion.

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“…Additionally, emission at 405 and 435 nm from Sr 3 Al 2 O 6 :Eu 2+ have been reported. 76 The contradictory results for Sr 3 Al 2 O 6 :Eu 2+ were explained in 2011 by Huang 77 showing that all the previous reports were mostly correct. The observed differences in emission spectra of Sr 3 Al 2 O 6 :Eu 2+ are caused by differences in excitation wavelengths.…”

Section: Sr 3 Al 2 O 6 :Eu 2+mentioning

confidence: 98%

Eu²⁺luminescence in strontium aluminates

Dutczak

Jüstel

Ronda

et al. 2015

Phys. Chem. Chem. Phys.

163

107

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One-step synthesis and morphology evolution of luminescent Eu2+ doped strontium aluminate nanostructures

Cited by 22 publications

References 22 publications

Persistent Luminescence Strontium Aluminate Nanoparticles as Reporters in Lateral Flow Assays

Persistent Luminescence Strontium Aluminate Nanoparticles as Reporters in Lateral Flow Assays

From 3D to 2D: Structural, Spectroscopic and Theoretical Investigations of the Dimensionality Reduction in the [PtAl₂]^δ− Polyanions of the Isotypic MPtAl₂ Series (M=Ca–Ba, Eu)

Eu²⁺luminescence in strontium aluminates

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One-step synthesis and morphology evolution of luminescent Eu2+ doped strontium aluminate nanostructures

Cited by 22 publications

References 22 publications

Persistent Luminescence Strontium Aluminate Nanoparticles as Reporters in Lateral Flow Assays

Persistent Luminescence Strontium Aluminate Nanoparticles as Reporters in Lateral Flow Assays

From 3D to 2D: Structural, Spectroscopic and Theoretical Investigations of the Dimensionality Reduction in the [PtAl2]δ− Polyanions of the Isotypic MPtAl2 Series (M=Ca–Ba, Eu)

Eu2+luminescence in strontium aluminates

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From 3D to 2D: Structural, Spectroscopic and Theoretical Investigations of the Dimensionality Reduction in the [PtAl₂]^δ− Polyanions of the Isotypic MPtAl₂ Series (M=Ca–Ba, Eu)

Eu²⁺luminescence in strontium aluminates