Synthesis and photoluminescence properties of Ca3R2−xWO9:xEu3+ (R=Y, Gd) phosphors

Ru, Jingjing; Qin, Xiao-Huan; Yan, Guiyang; Chen, Jianzhong

doi:10.1016/s1002-0721(14)60393-8

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…The cutoff phonon frequency vibrations can be inferred from the band appearing at 446 cm –1 , which is assigned to the La–O stretching vibrations. The existence of a low phonon frequency can support the least multiphonon relaxation in the phosphor sample. , There are no significant changes in the FTIR spectral band positions of the host lattice when doping with Er 3+ or Yb 3+ and codoping with both of them. The exceptionally low amount of hydroxyl groups (−OH) in all of the phosphor samples can result in high luminescence efficiency, suggesting that these materials can be suitable for practical device applications.…”

Section: Resultsmentioning

confidence: 96%

“…The FTIR spectra of the NLMWO, Er 3 + (6 mol %):NLMWO, Yb 3 + (1 mol %):NLMWO, and doubly doped Er 3+ (6 mol %)/Yb 3+ (1 mol %):NLMWO nanophosphor samples were recorded from 4000 to 400 cm −1 , as shown in Figure 3a and Table 1. The absorption band that can be observed at 1428 cm −1 is assigned 24,25 There are no significant changes in the FTIR spectral band positions of the host lattice when doping with Er 3+ or Yb 3+ and codoping with both of them. The exceptionally low amount of hydroxyl groups (−OH) in all of the phosphor samples can result in high luminescence efficiency, suggesting that these materials can be suitable for practical device applications.…”

Section: ■ Experimental Sectionmentioning

confidence: 93%

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Investigation of Upconversion Photoluminescence of Yb³⁺/Er³⁺:NaLaMgWO₆ Noncytotoxic Double-Perovskite Nanophosphors

2019

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Bright fluorescent rare-earth-ion-doped upconversion nanomaterials are attractive choices for photonic devices. A remarkable green upconversion emission has been obtained by the sensitizing effect of Yb 3+ in a Yb 3+ /Er 3+ :NaLaMgWO 6 (NLMWO) nanophosphor under near-infrared (NIR) excitation. A citrate sol−gel method was employed to synthesize the nanophosphor samples. The lack of a secondary phase in the X-ray diffraction pattern confirms that the Er 3+ and Yb 3+ ions are incorporated in the ordered double-perovskite structure. Surface analysis and particle evaluation are performed by field-emission scanning electron microscopy and transmission electron microscopy analysis. Upconversion and downconversion emission performances were systematically studied by varying the dopant concentrations. A strong upconversion green emission can be observed with the naked eye, and it resembles the upconversion spectra of Er 3+ -doped phosphors. Remarkably, because of an energy-transfer process, the green upconversion emission can be converted into a strong red emission by codoping with Yb 3+ ions. We observed the color tuning effect from green to red, which can be controlled by varying the Yb 3+ concentration in the codoped phosphors during NIR excitation. A systematic investigation of the upconversion mechanism from Yb 3+ to Er 3+ doubly doped NLMWO nanocrystals is demonstrated. The upconversion mechanism was evaluated only by varying the excitation power of the laser as well. A strong NIR emission at 1.57 μm corresponding to Er 3+ can be significantly enhanced by increasing the codoping concentration of Yb 3+ ions. The energy migration pathway is accurately presented. The Commission internationale de l'ećlairage color coordinates were analyzed for singly and doubly doped nanophosphors. The cytotoxicity of the codoped nanophosphor system was evaluated using WI-38 cell lines. This optimized codoped nanophosphor material is noncytotoxic; thus, it can be useful for in vitro studies in biological studies. On the basis of the obtained results, the NLMWO:Yb 3+ /Er 3+ nanophosphors can be a promising choice for novel upconversion photonic applications.

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Section: Resultsmentioning

confidence: 96%

Section: ■ Experimental Sectionmentioning

confidence: 93%

Investigation of Upconversion Photoluminescence of Yb³⁺/Er³⁺:NaLaMgWO₆ Noncytotoxic Double-Perovskite Nanophosphors

2019

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“…[26][27][28][29] A series of single-component rare-earth-doped phosphors using Li 2 Y 4 (MoO 4 ) 7 as the substrate material and their luminescence properties have been developed in our previous studies. [30][31][32] While the ET mechanism of multi-component rare earth in this matrix material is still deficient now. To develop a series of color-tunable phosphors with practical application, the ET process has been considered by introducing different rare-earth ions into the matrix simultaneously.…”

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confidence: 99%

Luminescence and Energy Transfer of Li₂Y₄(MoO₄)₇: Ln³⁺ (Ln = Dy, Eu) Phosphors

Zhao

Chen

et al. 2021

ECS J. Solid State Sci. Technol.

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A series of novel Li2Y4(MoO4)7: Ln3+ (Ln = Dy, Eu) phosphors with color-tunable were prepared through solid-state reaction. The crystal structures, photoluminescence properties, energy transfer process, decay, and chromaticity coordinates were also investigated. The emission color of Li2Y4(MoO4)7: Ln3+ (Ln = Dy, Eu) phosphors were tunable from pale yellow to the nearly white position by adjusting the concentrations of Dy3+ and Eu3+ ions or converting the excitation wavelength from 353 nm to 391 nm, and η τ could reach 49.33% when y = 0.60. These results indicated that Li2Y4(MoO4)7: Ln3+ (Ln = Dy, Eu) may be served as color tunable phosphors.

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Colour tuning via energy transfer of K2Ba(MoO4)2: Dy3+/Eu3+ phosphors with thermal-stable property

Ru,

Zhao,

Zeng

et al. 2024

Bull Mater Sci

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Synthesis and photoluminescence properties of Ca3R2−xWO9:xEu3+ (R=Y, Gd) phosphors

Cited by 6 publications

References 22 publications

Investigation of Upconversion Photoluminescence of Yb³⁺/Er³⁺:NaLaMgWO₆ Noncytotoxic Double-Perovskite Nanophosphors

Investigation of Upconversion Photoluminescence of Yb³⁺/Er³⁺:NaLaMgWO₆ Noncytotoxic Double-Perovskite Nanophosphors

Luminescence and Energy Transfer of Li₂Y₄(MoO₄)₇: Ln³⁺ (Ln = Dy, Eu) Phosphors

Colour tuning via energy transfer of K2Ba(MoO4)2: Dy3+/Eu3+ phosphors with thermal-stable property

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Synthesis and photoluminescence properties of Ca3R2−xWO9:xEu3+ (R=Y, Gd) phosphors

Cited by 6 publications

References 22 publications

Investigation of Upconversion Photoluminescence of Yb3+/Er3+:NaLaMgWO6 Noncytotoxic Double-Perovskite Nanophosphors

Investigation of Upconversion Photoluminescence of Yb3+/Er3+:NaLaMgWO6 Noncytotoxic Double-Perovskite Nanophosphors

Luminescence and Energy Transfer of Li2Y4(MoO4)7: Ln3+ (Ln = Dy, Eu) Phosphors

Colour tuning via energy transfer of K2Ba(MoO4)2: Dy3+/Eu3+ phosphors with thermal-stable property

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Investigation of Upconversion Photoluminescence of Yb³⁺/Er³⁺:NaLaMgWO₆ Noncytotoxic Double-Perovskite Nanophosphors

Investigation of Upconversion Photoluminescence of Yb³⁺/Er³⁺:NaLaMgWO₆ Noncytotoxic Double-Perovskite Nanophosphors

Luminescence and Energy Transfer of Li₂Y₄(MoO₄)₇: Ln³⁺ (Ln = Dy, Eu) Phosphors