Synthesis and photoluminescent characteristics of Eu 3+ -doped MMoO 4 (M=Sr, Ba) nanophosphors by a hydrothermal method

Li, Songchu; Yu, Li; Sun, Jing; Man, Xiaoqin

doi:10.1016/s1002-0721(17)60918-9

Cited by 18 publications

(3 citation statements)

References 37 publications

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“…In addition, both processes render a high population of photons in the excited level/levels of RE 3+ with concomitant enhanced emissions of RE 3+ . Different synthesis methods have been employed to enrich the luminescent efficiency of the as-prepared luminescent materials, ions-doped molybdates, which include the CaMoO 4 material. ,,,− The abovementioned synthesis methods include the Czochralski method, chemical precipitation method, , citrate–gel method, hydrothermal method, − polyol process, supersaturated recrystallization process, solid-state reaction, sol–gel process, wherein the quantum efficiency of the material is 20% higher than that obtained using a solid-state reaction sonochemical method, and microwave reaction. , …”

Section: Introductionmentioning

confidence: 99%

Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

et al. 2019

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In this article, the synthesis by means spray pyrolysis method, of the CaMoO4 and rare earth cation (RE 3+)-doped CaMoO4:xRE 3+ (RE 3+ = Eu 3+ , Tb 3+ , and Tm 3+ ; and x= 1%, 2%, and 4% mol) compounds is presented. The as-synthesized samples were characterized using x-ray diffraction (XRD), Rietveld refinement, field emission scanning electron microscopy (FE-SEM), Raman spectroscopy, and photoluminescence (PL) spectroscopy. To complement and rationalize the experimental results, first principle calculation, at density functional theory level, have been performed to analyze the band structure and density of states. In addition, a theoretical method based on the calculations of surface energies and Wulff construction was applied to obtain the morphology transformation of the CaMoO4 and CaMoO4:RE 3+ microstructures. The experimental morphologies can be observed in the FE-SEM images. The PL behavior of the co-doped samples exhibited well-defined bands in the visible region. The samples with 2% and 4% of RE 3+ released white emission according to the chromaticity coordinates (0.34, 0.34) and (0.34, 0.33), respectively. Present results provide not only a deep understanding of the structure-property relationships of CaMoO4-based phosphor, but also can be employed as a guideline for the design of the electronic structure of the materials and the fabrication of photo-functional materials with optimal properties, which allows for the modeling of new phosphors for applications in solid-state lighting.

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Section: Introductionmentioning

confidence: 99%

Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

et al. 2019

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“…The Eu 3+ ions in both compounds should thus be coordinated in asymmetric sites. 47,48 In the case of Y 2 O 2 S:Eu 3+ , the high R 21 of 6.59 suggests that the coordination of Eu 3+ ions should be largely distorted from the centrosymmetric geometry. The large distortion of symmetry can be primarily attributed to the mixed-anion coordination of O 2− and S 2− ions with great differences in their radii (1.40 vs 1.84 Å) 49 and electronegativity (3.610 vs 2.589).…”

Section: Resultsmentioning

confidence: 99%

Modeling Polyhedron Distortion for Mechanoluminescence in Mixed-Anion Compounds RE₂O₂S:Ln³⁺

Lin

Chen

et al. 2022

Chem. Mater.

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Mechanoluminescent (ML) materials with the characteristics of photon emission under mechanical stimulation show broad application prospects in building structural health diagnosis, biomechanical engineering, and wearable devices. However, existing ML materials cannot fully meet the requirements of different stress sensing applications due to the limited understanding of the structure and mechano-to-photon conversion mechanism of ML materials. Herein, we report novel ML materials with excellent self-recoverable ML performance in the family of mixed-anion compounds RE 2 O 2 S:Ln 3+ (RE = Y, Lu, La, Gd). The ML intensity is linearly related to the applied force, and the ML wavelength is tunable over a broad range of 514−1550 nm. More importantly, we construct a polyhedron distortion model that describes the local symmetry breaking. This model well explains the origin of ML and piezoelectricity in the compounds with centrosymmetric crystal structures. The findings may deepen the understanding of the microstructure and the mechano-to-photon conversion mechanism in ML materials and are expected to provide important guidance for the development of high-performance ML materials.

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“…7 Good performance of Eu 3+ as an efficient spectrum converter in various inorganic matrices has been reported in the literature. [8][9][10][11][12] The powders of Eudoped NaYF 4 compound were synthesized using the economic wet process. 13 We synthesized the powders at various molar proportions between Y and Eu.…”

Section: Methodsmentioning

confidence: 99%

Ultraviolet spectrum downshifting in polymer nanocomposite films for the enhancement of optoelectronic devices

Darwish,

Sarkisov,

Patel

et al. 2023

Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XVII

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We report on polymer nanocomposite films with ultraviolet (UV) spectrum down-shifting that can be transferred using the open-air multi-beam multi-target pulsed laser deposition (MBMT-PLD) on opto-electronic devices, such as photovoltaic (PV) cells, for the enhancement of their performance. The nanocomposites were made of the space-grade polymer CORIN impregnated with nanoparticles (NPs) of rare-earth (RE) doped compound NaYF 4 : Eu 3+ . NPs had a peak of down-shifted photoluminescence (PL) at 623 nm and a PL quantum yield (PLQE) of ~ 50%. The enhancement of the coated PV cells was two-fold: (a) protection from harmful solar UV radiation and (b) the increase of the PV conversion efficiency. We describe the results of characterization of the NPs using dynamic light scattering, X-ray diffraction, and optical spectroscopy. The nanocomposite films were deposited on Silicon heterojunction (SHJ), Copper-Indium-Gallium-Selenide (CIGS) and inverted metamorphic multijunction (IMM) solar cells. The cells were exposed to 365-nm UV radiation from a light emitting diode (LED). The I-V characteristics of the cells were measured with a solar simulator using AM0 filter. The proposed films improved UV stability of all three cell types: the power degradation significantly slowed down, CIGSs (by half). The proposed films have great commercial potential, especially for the applications to space power.

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Synthesis and photoluminescent characteristics of Eu 3+ -doped MMoO 4 (M=Sr, Ba) nanophosphors by a hydrothermal method

Cited by 18 publications

References 37 publications

Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

Modeling Polyhedron Distortion for Mechanoluminescence in Mixed-Anion Compounds RE₂O₂S:Ln³⁺

Ultraviolet spectrum downshifting in polymer nanocomposite films for the enhancement of optoelectronic devices

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Synthesis and photoluminescent characteristics of Eu 3+ -doped MMoO 4 (M=Sr, Ba) nanophosphors by a hydrothermal method

Cited by 18 publications

References 37 publications

Understanding the White-Emitting CaMoO4 Co-Doped Eu3+, Tb3+, and Tm3+ Phosphor through Experiment and Computation

Understanding the White-Emitting CaMoO4 Co-Doped Eu3+, Tb3+, and Tm3+ Phosphor through Experiment and Computation

Modeling Polyhedron Distortion for Mechanoluminescence in Mixed-Anion Compounds RE2O2S:Ln3+

Ultraviolet spectrum downshifting in polymer nanocomposite films for the enhancement of optoelectronic devices

Contact Info

Product

Resources

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Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

Understanding the White-Emitting CaMoO₄ Co-Doped Eu³⁺, Tb³⁺, and Tm³⁺ Phosphor through Experiment and Computation

Modeling Polyhedron Distortion for Mechanoluminescence in Mixed-Anion Compounds RE₂O₂S:Ln³⁺