CaMoO 4 :Dy 3+ ,Eu 3+ phosphors: microwave synthesis, characterization, tunable luminescence properties and energy transfer mechanism

Zhai, Yongqing; Zhao, Xin; Liu, Chang; Song, Peng; Jing, Xuemeng; Han, Ying; Wang, Jing

doi:10.1016/j.ijleo.2018.03.049

Cited by 28 publications

(19 citation statements)

References 28 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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“…In the family of AMoO 4 (A = Fe, Ca, Ni, etc. ), CaMoO 4 was found to be a molybdate-based considerable outstanding matrix material due to its scheelite structure and excellent physical and chemical properties, such as low phonon characteristics (850 cm –1 ), high melting point (1445–1480 °C), wide band gap (3.6 eV), nonhygroscopic behavior, high absorption cross-section (∼103 cm –1 ), and so forth. , In CaMoO 4 , the central Ca atom or Mo atom is coordinated with eight or four O atoms, respectively, which makes it more stable . Several reports have been reported on the optical properties of the CaMoO 4 phosphor. − …”

Section: Introductionmentioning

confidence: 99%

Facile Hydrothermal Synthesis and Electrochemical Properties of CaMoO₄ Nanoparticles for Aqueous Asymmetric Supercapacitors

Bhagwan

Hussain

2019

ACS Sustainable Chem. Eng.

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Calcium molybdate (CaMoO4) nanoparticles were prepared by a facile, adoptable, and cost-effective hydrothermal method. The synthesized nanoparticles were investigated by various material analysis techniques. The prepared nanomaterials were subjected as an electrode material for supercapacitors to check their electrochemical properties. The supercapacitive properties of CaMoO4 electrode material were obtained using the cyclic voltammetry, galvanostatic charging/discharging, and electrochemical impedance spectroscopy measurements. The specific capacity of the electrode material was found to be 118.25 mAh g–1 at 2 A g–1. At the high current density of 20 A g–1, the specific capacity of 50 mAh g–1 was obtained. To test the practical application of the electrode material, aqueous asymmetric supercapacitors (ASCs) were fabricated using CaMoO4 and activated carbon (AC) as positive and negative electrodes, respectively. The fabricated CaMoO4//AC device showed the specific capacity and energy density of 25.77 mAh g–1 and 18.68 W h kg–1, respectively at 0.5 A g–1. Twelve light-emitted diodes and a motor fan were powered using series-connected two ASC devices.

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“…In 2018, Zhai et al [ 120 ] prepared the CaMoO 4 :Eu 3+ , Dy 3+ scheelite using the MASS method with carbon as susceptor and metal carbonates as precursors. The irradiation program was 30 min at 560 W power level, using a DMO.…”

Section: Inorganic Luminescent Materials Obtained By Microwave-assisted Methodsmentioning

confidence: 99%

Microwave-Assisted Preparation of Luminescent Inorganic Materials: A Fast Route to Light Conversion and Storage Phosphors

et al. 2021

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Luminescent inorganic materials are used in several technological applications such as light-emitting displays, white LEDs for illumination, bioimaging, and photodynamic therapy. Usually, inorganic phosphors (e.g., complex oxides, silicates) need high temperatures and, in some cases, specific atmospheres to be formed or to obtain a homogeneous composition. Low ionic diffusion and high melting points of the precursors lead to long processing times in these solid-state syntheses with a cost in energy consumption when conventional heating methods are applied. Microwave-assisted synthesis relies on selective, volumetric heating attributed to the electromagnetic radiation interaction with the matter. The microwave heating allows for rapid heating rates and small temperature gradients yielding homogeneous, well-formed materials swiftly. Luminescent inorganic materials can benefit significantly from the microwave-assisted synthesis for high homogeneity, diverse morphology, and rapid screening of different compositions. The rapid screening allows for fast material investigation, whereas the benefits of enhanced homogeneity include improvement in the optical properties such as quantum yields and storage capacity.

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CaMoO 4 :Dy 3+ ,Eu 3+ phosphors: microwave synthesis, characterization, tunable luminescence properties and energy transfer mechanism

Cited by 28 publications

References 28 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

Facile Hydrothermal Synthesis and Electrochemical Properties of CaMoO₄ Nanoparticles for Aqueous Asymmetric Supercapacitors

Microwave-Assisted Preparation of Luminescent Inorganic Materials: A Fast Route to Light Conversion and Storage Phosphors

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CaMoO 4 :Dy 3+ ,Eu 3+ phosphors: microwave synthesis, characterization, tunable luminescence properties and energy transfer mechanism

Cited by 28 publications

References 28 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

Facile Hydrothermal Synthesis and Electrochemical Properties of CaMoO4 Nanoparticles for Aqueous Asymmetric Supercapacitors

Microwave-Assisted Preparation of Luminescent Inorganic Materials: A Fast Route to Light Conversion and Storage Phosphors

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Product

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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

Facile Hydrothermal Synthesis and Electrochemical Properties of CaMoO₄ Nanoparticles for Aqueous Asymmetric Supercapacitors