Vibrational spectrum and lattice dynamics of KY3F10 single crystals

Silva, E. N.; Ayala, A. P.; Gesland, J.Y.; Moreira, R. L.

doi:10.1016/j.vibspec.2004.05.004

Cited by 15 publications

(15 citation statements)

References 20 publications

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“…The extraordinary optical response of these materials arises from their electronic characteristics: sharp f - f transitions, low phonon energy (usually below 600 cm −1 ), and high viability of energy transfers with other ions [11] , [12] . Particularly, fluoride crystal lattices with trivalent yttrium cations are the most common due to the ease with which they replace Y 3+ ions by isovalent Ln 3+ ions [13] . Moreover, Eu 3+ has been widely appreciated for its adequacy as a site-sensitive structural probe, while the great similarity of its ionic radius to that of Y 3+ ensures a perfect incorporation of the Ln 3+ ion into the host matrix [14] .…”

Section: Introductionmentioning

confidence: 99%

The pH-dependent reactions in the sonochemical synthesis of luminescent fluorides: The quest for the formation of KY3F10 crystal phases

Serna-Gallén

Beltrán‐Mir²,

Cordoncillo³

2022

Ultrasonics Sonochemistry

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Section: Introductionmentioning

confidence: 99%

The pH-dependent reactions in the sonochemical synthesis of luminescent fluorides: The quest for the formation of KY3F10 crystal phases

Serna-Gallén

Beltrán‐Mir²,

Cordoncillo³

2022

Ultrasonics Sonochemistry

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“…Fluoride hosts with trivalent lattice cations such as Y 3+ are considered of paramount importance for photoluminescence because Y 3+ ions can easily be replaced by isovalent lanthanide ions [12]. Among them, both YF3 and the crystalline compounds of the related KF-YF3 system (KYF4, KY3F10, K2YF5, etc.)…”

Section: Introductionmentioning

confidence: 99%

Unraveling the superior role of dicarboxylic acids as surface chelators in Eu3+-doped yttrium fluorides: A systematic modulation of the crystal phases and morphologies for highly tuned optical performance

Serna-Gallén

Beltrán‐Mir

2021

Journal of Alloys and Compounds

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Eu 3+ -doped YF3 and KY3F10 phosphors have been prepared hydrothermally in a wide range of pH values without the use of surface chelators and adding oxalic or tartaric acid. We have proved, for the first time, the usefulness of dicarboxylic acids to modulate the evolution of the surface and crystal phases in the KF-YF3 system. The morphologies and crystal structures of the materials displayed a critical dependence on the pH and the chelator employed, and a plausible mechanism to explain the differences among the distinct series of samples is proposed. As a result, the fluorides exhibited outstanding and tunable photoluminescence, with extremely high quantum efficiencies and very long lifetimes. The asymmetry ratio and Judd-Ofelt parameters calculations allowed us to establish a relationship between the optical performance of the compounds and their physicochemical properties. We feel that this study can arouse widespread interest within the materials engineering community, since similar procedures could be implemented to the extended family of complex yttrium/lanthanide fluorides for advanced applications in important fields such as bioanalytics, biomedics, or photonics. Indeed, the materials in the present work, with orangish-yellow colored emissions, could be very interesting for application in white 2 light emitting diodes through their combination with blue chips.

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“…nScO for the former is at 906.5 cm À1 , and for the latter at 894.6 cm À1 . 19 The IR and Raman spectra of [Ln(OH 2 ) 9 ] 3+ , where Ln = La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu, gave detailed assignments for the LnO 9 unit (D 3h ). The IR spectrum includes bands at 452 and 463 cm À1 due to e u , a u modes, respectively.…”

Section: Scandium Yttrium and The Lanthanidesmentioning

confidence: 99%

“…318 Raman spectra for glasses in the system NaPO 3 -BaF 2 -WO 3 gave assignments to nW-O À , nWQO and nW-O-W modes. 324 The complex (19) has IR bands due to nWQO at 916 and 910 cm À1 , with nM-m 3 -S 434 cm À1 and nM-m 2 -S 453 cm À1 . 320 Similar experiments were used to follow the phase transitions aÀb-PbWO 4 near 450 1C.…”

Section: Chromium Molybdenum and Tungstenmentioning

confidence: 99%

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Vibrational spectra of transition element compounds

Davidson¹

Spectroscopic Properties of Inorganic and Organometallic Compounds

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Scandium, yttrium and the lanthanidesLaser-ablated scandium atoms react with H 2 O/N 2 mixtures to give matrix-trapped (Z 1 -N 2 )Sc(H)OH, (Z 1 -N 2 ) 2 Sc(H)OH and (Z 2 -N 2 )Sc(H)OH. nScH assignments, based on isotopic shifts and DFT calculations, are listed in Table 1. 1 The FTIR spectrum of Sc 3 N@C 80 gave assignments for two isomers-both with trigonal planar Sc 3 N units. 2 There is IR evidence that ScO + in noble gas matrices forms adducts [ScO(Ng) 5Àn (Ng 0 ) n ] + , where n = 0-5, Ng, Ng 0 = Ar, Kr, Xe. nScO assignments are given in Table 2. 3 Laser-evaporated ScO and N 2 , or Sc atoms and N 2 O form the matrix-trapped species OSc(Z 2 -N 2 ). This rearranges to an Z 1 -form (OScNN) on UV irradiation. nScO for the former is at 906.5 cm À1 , and for the latter at 894.6 cm À1 . 4 The Raman spectrum of [Sc(OSMe 2 ) 6 ] 3+ includes symmetric (a g ) and degenerate (e g ) nScO modes at 429, 451 cm À1 , respectively. The IR spectrum includes bands at 452 and 463 cm À1 due to e u , a u modes, respectively. 5 Ab initio calculations gave skeletal vibrational wavenumbers for Sc(mda) 3 ,where mda = C 3 H 3 O 2 À . 6 Raman studies have revealed grain-size effects for nanocrystalline ZrO 2 -Sc 2 O 3 , i.e. (ZrO 2 ) 1Àx (Sc 2 O 3 ) x , where x = 0.02-0.16. 7 The IR and Raman spectra of M 2 (M 0 O 4 ) 3 , where M = Sc, In, M 0 = Mo, W, gave characteristic assignments. For Sc 2 (MoO 4 ) 3 , variable-temperature spectra show the effects of the ferroelastic phase transition. 8 There have been two other reports of Raman studies of the phase behaviour of Sc 2 (MoO 4 ) 3 . 9,10 Raman spectroscopy was used to characterise intermediate compositions in the systems Ln 2 S 3 -Ln 0 2 S 3 , where Ln = La, Dy, L 0 = Sc, Lu etc. 11 The variable-temperature Raman spectra of Rb 2 KScF 6 (elpasolite) were used to follow temperature-induced phase transitions (using both ScF 6 and lattice modes). 12 The IR spectra of MCl 2 (k 3 -L)(thf), where M = Sc, Y, HL = (1), R = COOH, CSSH and CH 2 OH, include nMS near 300 cm À1 , and nMO (R = CH 2 OH) 570 cm À1 . 13 Characteristic Raman bands were seen at 204 and 42 cm À1 for a superconducting YNi 2 B 2 C single crystal. 14 The IR spectrum of Y 2 O 3 shows that nY-O shifts to lower wavenumber with decreased particle size. 15 Variable-temperature Raman spectroscopy was used to follow phase transitions of Y 2 O 3 -ZrO 2 . 16 IR and Raman spectra gave vibrational wavenumbers for orthorhombic M 2 BaCuO 5 , where M = Y, Ho or Gd, assigned using a short-range force constant model. 17 The Raman spectra of Ln 3 NbO 7 , where Ln = Y, La, Nd, Gd, in the temperature range 298-973K gave evidence for reversible structural disordering on increasing temperature. 18 IR data, together with previous Raman bands, gave assignments for KY 3 F 10 single crystals, supported by a normal coordinate analysis. 19 The IR and Raman spectra of [Ln(OH 2 ) 9 ] 3+ , where Ln = La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu, gave detailed assignments for the LnO 9 unit (D 3h ). 20 Structural characteristics of MFeGe 2 O 7 , where M...

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Vibrational spectrum and lattice dynamics of KY3F10 single crystals

Cited by 15 publications

References 20 publications

The pH-dependent reactions in the sonochemical synthesis of luminescent fluorides: The quest for the formation of KY3F10 crystal phases

The pH-dependent reactions in the sonochemical synthesis of luminescent fluorides: The quest for the formation of KY3F10 crystal phases

Unraveling the superior role of dicarboxylic acids as surface chelators in Eu3+-doped yttrium fluorides: A systematic modulation of the crystal phases and morphologies for highly tuned optical performance

Vibrational spectra of transition element compounds

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