Luminescence and vacuum ultraviolet excitation spectroscopy of samarium doped SrB4O7

Tuomela, Anne; Zhang, Meng; Huttula, Marko; Šakirzanovas, Simas; Kareiva, Aivaras; Попов, А. И.; Козлова, А. П.; Aravindh, S. Assa; Cao, Wei; Pankratov, V.

doi:10.1016/j.jallcom.2020.154205

Cited by 28 publications

(9 citation statements)

References 69 publications

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“…Actually, the lanthanide Sm and Na were substituted into the two cation Ca site and used as a proxy for actinides (U and Pu) within the apatite phase [ 24 ], where two different Sm-loaded samples are prepared to evaluate varying nuclear waste loading effects. Meanwhile, the rare-earth Sm doping in wide band gap materials play an important role in high-level optical devices and luminescent applications [ 25 ]. Finally, the helium ions irradiation induced microstructural evolution of the fluorapatite glass-ceramics were studied by 50 keV He + ion irradiation at 593 K.…”

Section: Introductionmentioning

confidence: 99%

Study on Irradiation Response of Nanocrystalline Phase in Sm-Doping Fluorapatite Glass-Ceramics under He Ion Irradiation

Lin

Jiang

et al. 2022

Nanomaterials

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Two different of Sm-loading fluorapatite (Ca10−2xNaxSmx(PO4)6F2, x = 1 and 2) glass-ceramics were synthesized by a two-step melt sintering method. The samples were irradiated with 50 keV He+ ions with a fluence of 2.6 × 1016 ions/cm2 at 593 K. The irradiation induced microstructural evolution were characterized by grazing incidence X-ray diffraction and cross-sectional transmission electron microscopy. For the smaller Sm-doping samples, no phase transformation is observed. Meanwhile, in the lager Sm-doping samples, the irradiation induced the crystals into smaller nanocrystals. The mechanism of the transformation of the crystalline phase was also analyzed and discussed.

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Section: Introductionmentioning

confidence: 99%

Study on Irradiation Response of Nanocrystalline Phase in Sm-Doping Fluorapatite Glass-Ceramics under He Ion Irradiation

Lin

Jiang

et al. 2022

Nanomaterials

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“…Some of the earliest studies of divalent lanthanides involved doping them into host matrices that allowed their usefulness as luminescent and magnetic materials to be assessed. − Synthesizing bulk compounds containing divalent lanthanides was dramatically simplified by the development of methods for obtaining several of the lanthanide (Nd, Sm, Eu, Dy, Tm, and Yb) dihalide salts, particularly the diiodide salts, on a larger scale (grams rather than milligrams). , These advances opened the door for greater exploration of divalent lanthanides like Sm(II) that exhibit interesting luminescent properties ,− which arise from electronic states that can be readily modulated to express either 4 f 6 → 4 f 6 or 4 f 5 5 d 1 → 4 f 6 transitions by changing pressure and temperature, making them useful for sensing applications . Additionally, the value of divalent samarium in organic reactions both as a one-electron reductant (especially in the form of SmI 2 ) and as an organometallic reagent is well-known. − The stabilization of samarium’s divalent state is also considered an important precursor for extrapolating the knowledge of low valent lanthanides to their actinide counterparts.…”

Section: Introductionmentioning

confidence: 99%

Influence of Outer-Sphere Anions on the Photoluminescence from Samarium(II) Crown Complexes

et al. 2021

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Three samarium(II) crown ether complexes, [Sm(15-crown-5)2]I2 (1), [Sm(15-crown-5)2]I2·CH3CN (2), and [Sm(benzo-15-crown-5)2]I2 (3), have been prepared via the reaction of SmI2 with the corresponding crown ether in either THF or acetonitrile in good to moderate yields. The compounds have been characterized by single crystal X-ray diffraction and a variety of spectroscopic techniques. In all cases, the Sm(II) centers are sandwiched between two crown ether molecules and are bound by the five etheric oxygen atoms from each crown ether to yield 10-coordinate environments. Despite the higher symmetry crystal class of 1 (R3c), the samarium center resides on a general position, whereas in 2 and 3 (both in P21/c) the metal centers lie upon inversion centers. Moreover, the complexes in 2 and 3 are approximated well by D 5d symmetry. The molecule in 1, however, is distorted from idealized D 5d symmetry, and the crown ethers are more puckered than observed in 2 and 3. All three complexes luminesce in the NIR at low temperatures. However, the nature of the luminescence differs between the three compounds. 1 exhibits broadband photoluminescence at 20 °C but at low temperatures transitions to narrow peaks. 2 only exhibits nonradiative decay at 20 °C and at low temperatures retains a mixture of broadband and fine transitions. Finally, 3 displays broadband luminescence regardless of temperature. Spin–orbit (SO) CASSCF calculations reveal that the outer-sphere iodide anions influence whether broadband luminescence from 5d → 4f or fine 4f → 4f transitions occur through the alteration of symmetry around the metal centers and the nature of the excited states as a function of temperature.

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“…In the first case, the transitions between energy levels of single ions are responsible for the luminescence of interest. As example here f–f or d–f transitions of rare‐earth elements in bulk compounds LaPO 4 :Ce 3+ ,Tb 3+ , [ 7 ] SrB 4 O 7 :Sm 2+/3+ , [ 8 ] NaLaF 4 :Er 3+ , [ 9 ] Gd 3 Ga 3 Al 2 O 12 :Ce 3+ , [ 10 ] and YVO 4 :Nd 3+ [ 11 ] should be mentioned. In the case of luminescence of molecular ions, the charge‐transfer radiative transition on metal–oxygen anion complex occurs for instance in PbWO 4 , [ 12 ] ZnWO 4 , [ 13 ] CaWO 4 , [ 14 ] CaMoO 4 , [ 15 ] SrMoO 4 , [ 16 ] etc.…”

Section: Introductionmentioning

confidence: 99%

Luminescence and Vacuum Ultraviolet Excitation Spectroscopy of Nanophosphors under Synchrotron Irradiation

Pankratov

Pankratova

Попов

2021

Physica Status Solidi (b)

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Vacuum ultraviolet (VUV) excitation spectroscopy under synchrotron irradiation is a powerful tool for the investigation of luminescence properties of wide bandgap nanocrystalline phosphor materials. The advantages of selective excitation in a wide spectral range present the possibility to explore the different aspects of luminescence processes in nanophosphors separately. It is shown that direct excitations of emission centers in wide bandgap materials need excitations in VUV spectral range and such excitations provide valuable information about f–f, f–d transitions, defects, and excitonic transitions in wide bandgap nanophosphors. It is also demonstrated that size‐dependent luminescence properties of nanophosphors are significant if the electron thermalization length becomes larger than the size of the nanoparticles. In this case, multiplication of electronic excitations processes well‐known in bulk materials are suppressed strongly in nanophosphors.

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Luminescence and vacuum ultraviolet excitation spectroscopy of samarium doped SrB4O7

Cited by 28 publications

References 69 publications

Study on Irradiation Response of Nanocrystalline Phase in Sm-Doping Fluorapatite Glass-Ceramics under He Ion Irradiation

Study on Irradiation Response of Nanocrystalline Phase in Sm-Doping Fluorapatite Glass-Ceramics under He Ion Irradiation

Influence of Outer-Sphere Anions on the Photoluminescence from Samarium(II) Crown Complexes

Luminescence and Vacuum Ultraviolet Excitation Spectroscopy of Nanophosphors under Synchrotron Irradiation

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