Phonons in isostructural (ND,Yb):Y Gd1−(VO4) laser crystals: A Raman scattering study

Zhang, Nana; Wang, Jing; Zhang, Huaijin; Santos, Clenilton Costa dos; Ayala, A. P.; Guedes, I.

doi:10.1016/j.jssc.2011.02.018

Cited by 12 publications

(4 citation statements)

References 46 publications

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“…The additional IR peak is assigned to the asymmetric stretching vibration (ν 3 ) of VO 4 groups, demonstrating the formation of VO 4 groups. Likewise, we also conduct Raman spectra of KBCP 2– x V x ( x = 0 and 0.2) samples (Figure b) and clearly observe Raman peaks of bending vibrations (385 (ν 2 ) and 341 (ν 2 ) cm –1 ) and stretching vibrations (914 (ν 1 ), 855 (ν 3 ), and 821 (ν 3 ) cm –1 ) of VO 4 groups − in the x = 0.2 sample when compared with the x = 0 sample, supporting the results of IR spectra. These findings corroborate our idea that the replacement of P 5+ in the KBCP compound with V 5+ ions is capable of affording the desired VO 4 groups.…”

Section: Resultssupporting

confidence: 79%

New Structural Design Strategy: Optical Center VO₄-Activated Broadband Yellow Phosphate Phosphors for High-Color-Rendering WLEDs

Dai

Wen

2022

ACS Sustainable Chem. Eng.

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Optical center VO4-activated non-rare-earth phosphors featuring impressive broadband emission are emerging as alternatives to rare-earth phosphors for lightings. However, most VO4-activated phosphors merely exist in vanadates and suffer from serious luminescence thermal quenching, which hinder the development of advanced VO4-activated phosphors. Herein, we put forward a new strategy of constructing optical center VO4 in non-vanadate compounds with thermal stability to enrich the number and variety of VO4-activated phosphors and improve their thermal stability. In this study, detailed structural analysis and theoretical calculation show that we have successfully constructed VO4 groups with a highly electron-localized property by substituting P5+ in the K2BaCa(PO4)2 (KBCP) host with V5+, confirming the formation of VO4 centers. In K2BaCa(PO4)2–x (VO4) x (KBCP2–x V x ) compounds, the appearance of VO4 groups significantly enhances the absorption efficiency of near-ultraviolet light, yielding a broadband yellow emission centered at 568 nm, with a full width at half-maximum of 213 nm. At 150 °C, the KBCP1.8V0.2 sample shows superior thermal stability with an emission loss of only 10%, surpassing the performances of VO4-activated vanadate phosphors ever reported. Using the KBCP1.8V0.2 phosphor, the resulting white-light-emitting diodes (WLEDs) show a high color rendering index of 87.3–93.4 and a wide range of correlated color temperatures of 4357–6510 K. Our results may stimulate more research on anionic-group-activated phosphors and accelerate the development of advanced VO4-activated phosphors.

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Section: Resultssupporting

confidence: 79%

New Structural Design Strategy: Optical Center VO₄-Activated Broadband Yellow Phosphate Phosphors for High-Color-Rendering WLEDs

Dai

Wen

2022

ACS Sustainable Chem. Eng.

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“…The spectroscopic investigation of SRS in tetragonal GdVO 4 singles crystal at “helium temperature” yielded the manifestation of several cascaded and cross‐cascaded χ (3) ‐nonlinear effects under participation of four fundamental ( ω SRS1 ≈ 887 cm −1 , ω SRS2 ≈ 812 cm −1 , ω SRS3 ≈ 823 cm −1 , ω SRS7 ≈ 385 cm −1 ) and two combined ( ω SRS5C ≈ 1699 cm −1 and ω SRS6C ≈ 75 cm −1 ) SRS‐promoting phonon modes, where the fundamental mode with energy of ω SRS3 ≈ 823 cm −1 was observed for the first time. Despite the fact that the vibration properties of REVO 4 crystals having the

D_{4 h}^{19}

‐tetragonal zircon (ZrSiO 4 )‐type structure are well studied (see, e.g., ) and earlier discovered “room‐temperature” SRS modes had been reliably assigned to their fundamental phonon modes (see. e.g., ), we now briefly consider the vibrational nature of the aforementioned “helium‐temperature” χ (3) ‐active modes.…”

Section: Spectra Of χ(3)‐nonlinear Lasingmentioning

confidence: 99%

Low‐temperature stimulated Raman scattering spectroscopy of tetragonal GdVO₄ single crystals

Kaminskii

Lux

Rhee

et al. 2014

Physica Status Solidi (b)

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We report on the results of low-temperature stimulated Raman scattering (SRS)-spectroscopy of tetragonal GdVO 4 single crystals. Measurements at T % 9 K and picosecond excitation in the visible and near-infrared range revealed new manifestations of x (3) -nonlinear photon-phonon interactions. Besides manyphonon Stokes and anti-Stokes octave spanning SRS generation we discovered a new fundamental x (3) -active phonon mode of the crystal. Furthermore, we received data on combined SRS-active vibrational modes. The lower limits of the steadystate Raman gain coefficients for first Stokes generation have been estimated together with the temperature dependence of these values in the range from T % 9 and 273 K. A short review of SRS-promoting vibrational modes and manifestations of x (3) -nonlinear interactions of all known SRS-active tetragonal rare-earth REVO 4 vanadates is given as well.

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“…Table 2 Their frequencies are very close in the free complex and are more than twice less than the frequency of stretching mode ν 1 . In crystals the characteristic frequency ranges of these modes are: A 1 (ν 1 ) -800-900, E(ν 2 ) -300-450, F 2 (ν 3 ) -700-900, F 2 (ν 4 ) -300-450 см -1 [24][25][26][27][28][29][30]. In aqueous solutions of (VO 4 ) 3− containing salts the frequencies are:…”

Section: Group Theoretical Analysis and Polarization Rulesmentioning

confidence: 99%

Phonon excitations in the quasi-one-dimensional Haldane phase of SrNi2V2O8

Kurnosov

Gnezdilov

Lemmens

et al. 2017

Low Temperature Physics

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Vibrational Raman spectra of a single crystal of the coupled Haldane chain compound SrNi 2 V 2 O 8 with uniaxial anisotropy were investigated in the 10-1000 cm −1 frequency range at temperatures 7-300 K. No structural phase transition was observed. The number of phonon lines observed in the experiment and their intensity were analyzed on the basis of the local symmetry considerations of different structural complexes. This approach was successful in explaining the discrepancy between the numbers of expected and experimentally observed phonon lines. Closeness of a real arrangement of some structural units to higher symmetry than the Wyckoff position results in strong interferential quenching of a number of Raman lines in the spectra. PACS: 78.30.-j Infrared and Raman spectra; 63.20.-e Phonons in crystal lattices.

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Phonons in isostructural (ND,Yb):Y Gd1−(VO4) laser crystals: A Raman scattering study

Cited by 12 publications

References 46 publications

New Structural Design Strategy: Optical Center VO₄-Activated Broadband Yellow Phosphate Phosphors for High-Color-Rendering WLEDs

New Structural Design Strategy: Optical Center VO₄-Activated Broadband Yellow Phosphate Phosphors for High-Color-Rendering WLEDs

Low‐temperature stimulated Raman scattering spectroscopy of tetragonal GdVO₄ single crystals

Phonon excitations in the quasi-one-dimensional Haldane phase of SrNi2V2O8

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Phonons in isostructural (ND,Yb):Y Gd1−(VO4) laser crystals: A Raman scattering study

Cited by 12 publications

References 46 publications

New Structural Design Strategy: Optical Center VO4-Activated Broadband Yellow Phosphate Phosphors for High-Color-Rendering WLEDs

New Structural Design Strategy: Optical Center VO4-Activated Broadband Yellow Phosphate Phosphors for High-Color-Rendering WLEDs

Low‐temperature stimulated Raman scattering spectroscopy of tetragonal GdVO4 single crystals

Phonon excitations in the quasi-one-dimensional Haldane phase of SrNi2V2O8

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Product

Resources

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New Structural Design Strategy: Optical Center VO₄-Activated Broadband Yellow Phosphate Phosphors for High-Color-Rendering WLEDs

New Structural Design Strategy: Optical Center VO₄-Activated Broadband Yellow Phosphate Phosphors for High-Color-Rendering WLEDs

Low‐temperature stimulated Raman scattering spectroscopy of tetragonal GdVO₄ single crystals