Chemical bond parameters, charge transfer band in Eu3+-activated La2Mo2O9 phosphors based on complex chemical bond theory

Zhu, Yi; Liu, Yun; Tan, Guoqiang; Liu, Wenlong; Ren, Huijun; Liu, Dinghan; Bai, Shaojie; Wang, Rong; Ye, Sen

doi:10.1016/j.ceramint.2020.04.140

Cited by 21 publications

(4 citation statements)

References 48 publications

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“…In case of molybdate and tungstate compounds this type of absorption is realized through O 2À / Mo 6+ or O 2À / W 6+ charge transfer providing a wide band in 250-350 nm range in the PL excitation spectra. [7][8][9][10] From LED application viewpoint suitable PL excitation can be achieved simultaneously through a direct f-f transition in rare earth ions and by light absorption of the host. It is worth noting that the most intensive absorption usually takes place in the energy region near to the host band gap.…”

Section: Introductionmentioning

confidence: 99%

Crystal growth, layered structure and luminescence properties of K₂Eu(PO₄)(WO₄)

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Crystal growth, layered structure and luminescence properties of K₂Eu(PO₄)(WO₄)

et al. 2022

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“…The increasing demand for red-emitting phosphors and the continuous discovery of various types of crystals have advanced the rapid development of Eu 3+ -doped inorganic phosphors. Specially, the charge transfer band of Mo–O and W–O generates a weak optical signal in tungstate and molybdate, causing self-activation. , Interestingly, the photoluminescence (PL) properties of the inorganic, such as La 2 Mo 2 O 9 , La 2 Mo 3 O 12 , CaMoO 4 , and CaWO 4 containing Mo–O or W–O bond were tuned to the appearance of red emission by introducing Eu 3+ . Based on economic considerations, aluminosilicate-type red-emitting phosphors obtained using Si and Al instead of W and Mo have rapidly developed.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of the Red-Emitting (Ba, Ca)₂ScAlO₅:Eu³⁺ Phosphors with Photoluminescence Properties

et al. 2022

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The light-emitting diodes (LED) are regarded as one of the most promising devices for inexpensive and widely used illumination; in particular, they are highly dependent on the development of red-emitting phosphors. Herein, we developed two types of red-emitting (Ba, Ca) 2 ScAlO 5 :Eu 3+ multiple excitations phosphors (λ ex = 255−465 nm) via freeze-drying followed by calcination. Powder X-ray diffraction and NMR results point out that they have hexagonal space group P6 3 /mmc (194), and the structural framework is composed of multi-coordinated Al 3+ −O 2− polyhedron and Sc 3+ −O 2− polyhedron. In addition, the valence state of europium (Eu 3+ ) is confirmed by X-ray photoelectron spectroscopy characterization. Investigation on the photoluminescence properties showed that the photoluminescence process of (Ba, Ca) 2 ScAlO 5 :Eu 3+ is attributable to the charge transfer band of Eu−O and abundant spectral terms of Eu 3+ . The α-(Ba, Ca) 2 ScAlO 5 :Eu 3+ and β-(Ba, Ca) 2 ScAlO 5 :Eu 3+ exhibited red emission under 465 and 395 nm excitation, respectively. The PL spectra and decay curves explain the intrinsic photoluminescence mechanism. The strongest emission peaks of the red-emitting α-(Ba, Ca) 2 ScAlO 5 :Eu 3+ and β-(Ba, Ca) 2 ScAlO 5 :Eu 3+ phosphors are at 615 and 619 nm, respectively, exhibiting a high fluorescence of 64 and 67% under the temperature of 423 K (150 °C). Further exploration of the red-emitting phosphors would provide a variety of choices for the design of red LEDs and white LEDs for the solid-state lighting system.

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“…In this research work, we use previously reported hydrothermal method to synthesize pure and Fe doped LAMOX nanomaterials [45,46]. We also report DC electrical and dielectric measurements of such materials for potential electronic applications.…”

Section: Introductionmentioning

confidence: 99%

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La₂Mo₂O₉

Mazhar¹,

Bılal²,

Waheed³

et al. 2021

Phys. Scr.

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Nanocrystalline Lanthanum Molybdenum Oxide powders (having crystallite size from 67 nm-287 nm) and chemical composition: La2−xFexMo2O9 (x = 0.0, 0.012, 0.024, 0.036), synthesized by hydrothermal method is being reported in this research. XRD, SEM and EDS were used to study the structure, morphology, and chemical compositions respectively. Temperature dependent electrical and dialectic properties were examined at temperatures ranging from 300 K to 450 K. DC electrical conductivity was found to be increasing with increasing Fe3+ concentration. Furthermore, the measured dielectric loss was very small. It also exhibited a decreasing trend with increasing Fe3+ concentration. A lower dielectric loss makes such materials suitable potential candidates for applications in super capacitors.

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Chemical bond parameters, charge transfer band in Eu3+-activated La2Mo2O9 phosphors based on complex chemical bond theory

Cited by 21 publications

References 48 publications

Crystal growth, layered structure and luminescence properties of K₂Eu(PO₄)(WO₄)

Crystal growth, layered structure and luminescence properties of K₂Eu(PO₄)(WO₄)

Synthesis of the Red-Emitting (Ba, Ca)₂ScAlO₅:Eu³⁺ Phosphors with Photoluminescence Properties

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La₂Mo₂O₉

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Chemical bond parameters, charge transfer band in Eu3+-activated La2Mo2O9 phosphors based on complex chemical bond theory

Cited by 21 publications

References 48 publications

Crystal growth, layered structure and luminescence properties of K2Eu(PO4)(WO4)

Crystal growth, layered structure and luminescence properties of K2Eu(PO4)(WO4)

Synthesis of the Red-Emitting (Ba, Ca)2ScAlO5:Eu3+ Phosphors with Photoluminescence Properties

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La2Mo2O9

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Product

Resources

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Crystal growth, layered structure and luminescence properties of K₂Eu(PO₄)(WO₄)

Crystal growth, layered structure and luminescence properties of K₂Eu(PO₄)(WO₄)

Synthesis of the Red-Emitting (Ba, Ca)₂ScAlO₅:Eu³⁺ Phosphors with Photoluminescence Properties

Improved electrical properties of hydrothermally synthesized pure and Fe doped nanocrystalline La₂Mo₂O₉