X-Ray Excited Optical Luminescence (XEOL): Potentiality and Limitations for the Detection of XANES/EXAFS Excitation Spectra

Goulon, J.; Tola, Pascal; Brochon, Jean‐Claude; Lemonnier, M.; Dexpert‐Ghys, Jeannette; Guilard, Roger

doi:10.1007/978-3-642-46522-2_128

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…Site-selective X-ray absorption spectra have been recorded before, using different techniques such as ion-desorption detection, luminescence detection, X-ray standing waves, or diffraction anomalous fine structure (DAFS) . Each of these methods has its own advantages and limitations.…”

Section: Introductionmentioning

confidence: 99%

Site-Selective EXAFS in Mixed-Valence Compounds Using High-Resolution Fluorescence Detection: A Study of Iron in Prussian Blue

et al. 2002

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A quantitative analysis is presented for the site-selective Fe K-edge absorption spectra of Prussian Blue: Fe 4 [Fe-(CN) 6 ] 3 ‚xH 2 O (x) 14−16). The site-selective spectra were recorded using high-resolution fluorescence detection of the K emission from a polycrystalline sample. The K fluorescence lines arising from the high-spin and lowspin sites are shifted in energy. Since the emission features partially overlap, fluorescence-detected absorption spectra using different emission energies represent different linear combinations of the pure high-spin and low-spin EXAFS. A numerical method was used to extract the individual site EXAFS spectra from the experimental data. The analysis yields a range of solutions. A unique solution can be obtained if homovalent model compounds are used to simulate the K fluorescence emission from the two Fe sites in Prussian Blue. EXAFS analysis of the range of spectra obtained in the numerical method yields almost identical interatomic distances for the different spectra while the Debye−Waller factors vary considerably. The distances obtained in the EXAFS fit correspond to the crystallographic distances.

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Section: Introductionmentioning

confidence: 99%

Site-Selective EXAFS in Mixed-Valence Compounds Using High-Resolution Fluorescence Detection: A Study of Iron in Prussian Blue

et al. 2002

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“…The other possibility is, the conduction band electrons can get captured in the Eu 3+ level thus producing Eu 2+ which results in decaying to the lower energy state causing the broadband emission nearly at 500 nm. From the figure the six processes that take place are; (1) the creation of electron and hole after the incident of photon energy, (2) The emission of photon on the recombination of electron and hole excites the Eu 3+ ions., (3) The characteristic Eu 2+ luminescence is produced by the decay of excited Eu 2+ to ground state which was produced by trapping of an electron in conduction band in Eu 3+ ion, (4) V k (defect center) trap the holes along with the electrons in Eu 2+ centers, (5) Through tunneling process the electron in Eu 2+ and holes from V k recombines and regenerating the Eu 3+ , O j defects in material, (6) The characteristic Eu 3+ emission is because of d to f transition is produced by decaying of Eu 3+ from excited to ground state [105][106][107][108][109]. Homa Homayoni et al recently carried out XEOL studies of Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ .…”

Section: X-ray Excited Optical Luminescence (Xeol)mentioning

confidence: 99%

Review on long afterglow nanophosphors, their mechanism and its application in round-the-clock working photocatalysis

Bidwai¹,

Sahu²,

Dhoble³

et al. 2022

Methods Appl. Fluoresc.

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Semiconductor assisted photocatalysis is one of the most efficient methods for the degradation of complex organic dyes. A major limiting factor of semiconductor assisted photocatalysis is the requirement of a continuous source of light to perform a redox reaction. One of the upcoming solutions is photon energy-storing long afterglow/persistent phosphors. They are an unusual kind of rechargeable, photon energy capturing/trapping phosphors that can trap charge carriers (electrons/holes) in their meta-stable energy levels, thereby resulting in persistent luminescence. Persistence luminescence from such materials can range from minutes to hours. The coupling of long afterglow phosphors (LAP) with the conventional semiconductor is a promising way to support the photocatalytic process even in dark. In addition, dissimilar band structures of LAPs and semiconductor results in formation of heterojunction which further suppresses the recombination of charge. Such an encouraging idea of LAP for round-the-clock working photocatalytic system is in its premature stage; which is required to be investigated fully. Thus, we present a state-of-art review on the potential materials for assisting round-the-clock photocatalysis, trapping-detrapping mechanism in LAP materials, fabrication strategies and their associated characterization tools. Review also covers LAP materials and their photocatalytic mechanism briefly.

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Organotin Compounds

Schumann

Buschbeck³

et al. 1987

Sn Organotin Compounds

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X-Ray Excited Optical Luminescence (XEOL): Potentiality and Limitations for the Detection of XANES/EXAFS Excitation Spectra

Cited by 5 publications

References 6 publications

Site-Selective EXAFS in Mixed-Valence Compounds Using High-Resolution Fluorescence Detection: A Study of Iron in Prussian Blue

Site-Selective EXAFS in Mixed-Valence Compounds Using High-Resolution Fluorescence Detection: A Study of Iron in Prussian Blue

Review on long afterglow nanophosphors, their mechanism and its application in round-the-clock working photocatalysis

Organotin Compounds

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