X-ray photoemission and spectral investigations of Dy3+ activated magnesium pyrophosphate phosphors

Mahajan, Rubby; Kumar, Sandeep; Prakash, Ram; Kumar, Vinay; Choudhary, R. J.; Phase, D. M.

doi:10.1016/j.jallcom.2018.10.355

Cited by 49 publications

(8 citation statements)

References 40 publications

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“…Substituting ions with different valences can cause oxygen vacancies, which can affect tetrahedral symmetry and lead to peaks due to metal–oxygen bond vibrations in the 600–1000 cm –1 range . Previous studies showed that the stretching vibration bonds of Ba–O are near 860 cm –1 , while the 1092.01 and 1068.57 cm –1 peaks correspond to P–O tensile vibrations. , The defects created by the substitution result in new bands and slight shifts in the band wavenumbers.…”

Section: Resultsmentioning

confidence: 99%

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Vacancy-Enhanced Self-Reduction of Eu in Pyrophosphate Phosphor

Wang,

Su,

Mei

et al. 2023

Inorg. Chem.

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The self-reduction mechanism in pyrophosphate phosphors is currently explained through nonequivalent substitution for charge compensation. Nevertheless, the impact of oxygen vacancies on the self-reduction enhancement requires further investigation. Herein, heterovalent Ba1–x Zn1–y P2O7:xEu2+/3+, yMg phosphors with rigid structures were prepared through conventional solid-phase technology in air. The cation substitution strategy leads to different chemistry electronegativity and adjustable crystal field environments and creates vacancy defects. Crystal structure and component analysis indicate the gradual phase segregation change from BaZnP2O7 to BaMgP2O7 with increasing Mg2+ content. The CIE coordinates that are tuned from (0.514, 0.334) to (0.326, 0.152) and realize color-tunable emission from red-orange to blue-violet can be used as multicolor functional materials. Besides, the phosphor demonstrates its maximum S a of 0.4725% K–1 (498 K) and S r of 1.376% K–1 (423 K). These results demonstrate that the phosphors have the potential for contactless optical temperature measurement and anticounterfeiting. This work not only investigates the self-reduction of the Eu3+ → Eu2+ phenomenon but also provides a supplementary explanation and data support to complete the effect of the oxygen vacancy on self-reduction.

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Section: Resultsmentioning

confidence: 99%

“…47 Previous studies showed that the stretching vibration bonds of Ba−O are near 860 cm −1 , while the 1092.01 and 1068.57 cm −1 peaks correspond to P−O tensile vibrations. 48,49 The defects created by the substitution result in new bands and slight shifts in the band wavenumbers.…”

Section: Resultsmentioning

confidence: 99%

Vacancy-Enhanced Self-Reduction of Eu in Pyrophosphate Phosphor

Wang,

Su,

Mei

et al. 2023

Inorg. Chem.

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“…In PL spectra, there is no emission wavelength are observed in pure sample i.e., the Mg 2 P 2 O 7 has localized (extrinsic) type luminescence [7]. After Eu 3+ / Dy 3+ single or co-doped in Mg 2 P 2 O 7 phosphor, it has seen that the strong host absorption band along with weak absorption peaks in the region 345-500 nm due to 4f-4f transition of rare earth ion [7,13] is shown in figure 12 and agree with PL excitation spectrum in figure 6(a). In the excitation spectrum, there is no host absorption transition is observed.…”

Section: Diffuse Reflectance Spectrummentioning

confidence: 98%

“…Structural, spectral, and optical properties of Eu 3+ / Dy 3+ single and co-doped Mg 2 P 2 O 7 phosphor are studied in detail. We have investigated the spectral and optical properties of Dy 3+ activated Mg 2 P 2 O 7 phosphor in our earlier report [13].…”

Section: Introductionmentioning

confidence: 99%

Structural, electronic and optical characterization of Eu^₃+/Dy^₃+ single and co-doped Mg₂P₂O₇ phosphors

Mahajan¹,

Prakash²,

Choudhary³

et al. 2021

Phys. Scr.

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Eu3+/ Dy3+ single and co-doped magnesium pyrophosphate phosphors were synthesized via solution combustion route. The resulted phosphor has a monoclinic crystal structure with space group B21/c. The lattice parameter of the sample is refined using ‘Full Prof software’. x-ray photoemission spectroscopy (XPS) result reveals that dysprosium and europium present in a trivalent valence state. Valence band spectra (VBS) result indicates that 6 features present in a single doped sample and 8 features present in a co-doped sample. The photoluminescence studies reveal that the combination of Eu3+ and Dy3+ emissions give tuneable emission from red to pink to yellowish-white under UV excitation. The energy transfer mechanism from Dy3+ to Eu3+ is confirmed from photoluminescence spectra and life time curves. The optical band gap of the prepared samples is obtained to be in the range of 5.02–5.40 eV. The synthesized material has conventional application in solid-state lighting under UV-excitation.

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“…Finally, the high-resolution spectrum of the Dy 4d core level is deconvoluted into two peaks Dy 4d 3/2 and Dy 4d 5/2 due to the electrostatic interactions of the 4d hole and 4f electrons with the spin-orbit splitting of 4d 5/2 and 4d 3/2 states. 64,65 It should be mentioned that the Dy core level was recognizable after deconvolution because the concentration of Dy in the CdTP is low. Dy 4d 3/2 and Dy 4d 5/2 binding energies are located at 158.7 eV and 156.5 eV, respectively, which is reported for the binding energies of the Dy 4d core level in Dy 2 O 3 .…”

Section: Papermentioning

confidence: 99%

Visible light-driven photocatalytic activity of wide band gap ATiO₃ (A = Sr, Zn and Cd) perovskites by lanthanide doping and the formation of a mesoporous heterostructure with ZnS QDs

2022

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X-ray photoemission and spectral investigations of Dy3+ activated magnesium pyrophosphate phosphors

Cited by 49 publications

References 40 publications

Vacancy-Enhanced Self-Reduction of Eu in Pyrophosphate Phosphor

Vacancy-Enhanced Self-Reduction of Eu in Pyrophosphate Phosphor

Structural, electronic and optical characterization of Eu^₃+/Dy^₃+ single and co-doped Mg₂P₂O₇ phosphors

Visible light-driven photocatalytic activity of wide band gap ATiO₃ (A = Sr, Zn and Cd) perovskites by lanthanide doping and the formation of a mesoporous heterostructure with ZnS QDs

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X-ray photoemission and spectral investigations of Dy3+ activated magnesium pyrophosphate phosphors

Cited by 49 publications

References 40 publications

Vacancy-Enhanced Self-Reduction of Eu in Pyrophosphate Phosphor

Vacancy-Enhanced Self-Reduction of Eu in Pyrophosphate Phosphor

Structural, electronic and optical characterization of Eu 3+/Dy 3+ single and co-doped Mg2P2O7 phosphors

Visible light-driven photocatalytic activity of wide band gap ATiO3 (A = Sr, Zn and Cd) perovskites by lanthanide doping and the formation of a mesoporous heterostructure with ZnS QDs

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Structural, electronic and optical characterization of Eu^₃+/Dy^₃+ single and co-doped Mg₂P₂O₇ phosphors

Visible light-driven photocatalytic activity of wide band gap ATiO₃ (A = Sr, Zn and Cd) perovskites by lanthanide doping and the formation of a mesoporous heterostructure with ZnS QDs