Tunable optical properties of multiphase ZnO–V 2 O 5 polycrystalline powders

Kumar, E. Senthil; Bellarmine, F.; Ramanjaneyulu, M.; Deepthi, Divya; Rao, M. S. Ramachandra

doi:10.1016/j.scriptamat.2015.05.042

Cited by 12 publications

(3 citation statements)

References 20 publications

(33 reference statements)

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“…We then divide the emission band of KBCP 2– x V x phosphors into two Gaussian bands at 18709 cm –1 (∼534 nm) and 16811 cm –1 (∼595 nm) that are assigned to typical transitions 3 T 2 – 1 A 1 and 3 T 1 – 1 A 1 of VO 4 groups, respectively (Figure b) . By monitoring emissions at 534 and 595 nm, we observe that profiles of the two PLE spectra are nearly identical in addition to the excitation intensity, indicating that two emissions stem from one optical center VO 4 .…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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 phenomenon of spectral overlap between VO 4 absorption and Bi 3+ absorption when monitoring Bi 3+ emission indicates that the energy transfer process should exist between VO 4 3− and Bi 3+ . The broadband excitation spectra of vanadate phosphors are due to the charge transfer (CT) of an electron from the oxygen 2 p orbital to the vacant 3 d in tetrahedral VO 4 with T d symmetry, ie 1 A 1 → 2 T 1 and 1 A 1 → 1 T 1 transitions . The possible VO 4 →Bi 3+ energy transfer scheme (Figure inset) is described as followed: Under UV irradiation, excited energy are absorbed through VO 4 1 A 1 → 2 T 1 and 1 A 1 → 1 T 1 transitions.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and luminescence study of Zn₃V₂O₈: Bi³⁺ yellow phosphor for solar spectral conversion

Zhang

Guan

Zhou

et al. 2017

Int J Applied Ceramic Tech

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A yellow phosphor Zn3V2O8: Bi3+ was synthesized by solid‐state method. It can efficiently absorb UV photons of 250‐400 nm, and convert into strong yellow emission with maximum at 550 nm, which can be absorbed by dye‐sensitized solar cells (DSSCs). VO4→Bi3+ energy transfer is discussed. The critical Bi3+ concentration is 0.04 with critical distance of 13.25 Å. The CIE coordinates of Zn3V2O8: Bi3+ are (0.421, 0.518). Zn3V2O8: Bi3+ phosphor exhibits good thermal stability with T1/2=150°C. The results indicate that Zn3V2O8: Bi3+ phosphor is a promising UV‐absorbing spectral converter to enhance power conversion efficiency and photochemical stability of DSSCs.

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“…It was reported that the method of synthesis and preparation has an important effect on the morphology, homogeneity, photocatalytic performance, and sinterability of ceramic powders . Some approaches for synthesizing V‐doped ZnO particles and ZnO‐V 2 O 5 composites have been proposed including solid‐state reaction, sol‐gel, co‐precipitation method, decomposition method, etc. To the best of our knowledge, a study focused on the preparation of V‐doped ZnO via microemulsion method and its photocatalytic properties has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Microemulsion synthesis, optical and photocatalytic properties of vanadium‐doped nano ZnO

Shahi

Hassanzadeh-Tabrizi

Saffar‐Teluri

2017

Int J Applied Ceramic Tech

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In the present work, vanadium-doped ZnO nanoparticles with different V concentrations were prepared via microemulsion method and employed as an effective photocatalyst for the degradation of methylene blue. The prepared samples were characterized by different techniques such as thermogravimetric and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM), elemental mapping (MAP), and ultraviolet-visible spectroscopy (Uv-Vis). The XRD patterns of vanadium-doped samples were assigned to wurtzite structure of ZnO and vanadium ions were incorporated into the lattice of zinc oxide. SEM images showed that the synthesized pure zinc oxide has irregular morphology and with adding vanadium dopant, rod and cube-like morphology appeared. The band gap energy of pure ZnO decreased from 3.3 to 3.21 eV on adding 1% vanadium. The results showed that the zinc oxide doped with 1% vanadium exhibited better photocatalytic activity compared to other samples. The possible mechanism for improving of photodegradation efficiency of doped samples was also discussed. K E Y W O R D S microemulsion, nanoparticles, photocatalyst, vanadium, ZnO

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Tunable optical properties of multiphase ZnO–V 2 O 5 polycrystalline powders

Cited by 12 publications

References 20 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

Synthesis and luminescence study of Zn₃V₂O₈: Bi³⁺ yellow phosphor for solar spectral conversion

Microemulsion synthesis, optical and photocatalytic properties of vanadium‐doped nano ZnO

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Tunable optical properties of multiphase ZnO–V 2 O 5 polycrystalline powders

Cited by 12 publications

References 20 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

Synthesis and luminescence study of Zn3V2O8: Bi3+ yellow phosphor for solar spectral conversion

Microemulsion synthesis, optical and photocatalytic properties of vanadium‐doped nano ZnO

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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

Synthesis and luminescence study of Zn₃V₂O₈: Bi³⁺ yellow phosphor for solar spectral conversion