Extensive studies of host lattices and activators in lanthanide phosphors based on efficient synthesis

Zheng, Yufeng; Huo, Jiansheng; Yang, Jinglian; Hu, Jing; Gao, Jinwei; Wang, Qianming

doi:10.1016/j.jallcom.2016.03.209

Cited by 12 publications

(9 citation statements)

References 31 publications

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“…It is estimated that the incorporation of red phosphors generated more opacity for the device and the reduced light extraction affected the resultant efficiency. The above results supported that the obtained device changed from cool light to warm light, and the as-prepared MGS:Mn 4+ , Li + phosphor will be potentially used as a red emitter for the application in warm WLEDs or sensing fields. − …”

Section: Resultssupporting

confidence: 62%

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

et al. 2019

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The substitution of metal sites in Mg 2 TiO 4 substrate leads to charge imbalance that will be closely related to a variety of changes including lattice structure, cell distortion, and photophysical properties. Herein, the co-substitution strategy of [Ga 3+ −Ga 3+ ] for [Mg 2+ −Ti 4+ ] and Sn 4+ for Ti 4+ achieves for the first time the novel Mg 3 Ga 2 SnO 8 (MGS):xMn 4+ (x = 0−3%) phosphors with efficient red emissions. In terms of X-ray powder diffraction (XRD) and Rietveld refinement analysis, MGS:Mn 4+ possesses a structure isotypic of Mg 2 TiO 4 in the cubic space group Fd3̅ m (227). There are two types of octahedra for Mn 4+ ions in this structure, where Ga 3+ ions completely occupy a group of octahedral sites and Mg 2+ /Sn 4+ has been randomly distributed over another group of octahedral sites. A strong excitation band in the broad spectral range (220− 550 nm) has been identified, thus facilitating the commercial uses for blue LED chips excitation. An intense red emission band at 680 nm has been observed due to the characteristic 2 E g − 4 A 2g transition of Mn 4+ ions. A concentration quenching effect occurs when the Mn 4+ content exceeds 1.5%, and the quenching mechanism is demonstrated to be dipole−quadrupole interactions. Temperature-dependent luminescence measurements support its good thermal stability, and the corresponding activation energy E a is determined to be 0.2552 eV. The possible luminous mechanism of the Mn 4+ ion is explained by the Tanabe−Sugano energy level diagram. The crystal field strength and the Racah parameters together with the nephelauxetic ratio are also determined for Mn 4+ in the MGS lattice. High color rendition warm white-lightemitting diodes (WLEDs) based on the optimal phosphor MGS:1.5%Mn 4+ ,1.5%Li + possess a color rendering index and color temperature of 85.6 and 3658 K, respectively. Its feasibility for application in solid-state white lighting has been verified.

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Section: Resultssupporting

confidence: 62%

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

et al. 2019

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“…These materials attracted significant attention due to their novel structural characteristics and potential applications in various fields [34][35] . In particular, RE 3+ are added to the host matrices to enhance the luminescent properties 19,36 . PL spectroscopy is a very efficient tool for the evaluation of the order-disorder effects in semiconductors, which leads to a better understanding of the structural changes that take place in materials.…”

Section: Introductionmentioning

confidence: 99%

“…Inorganic materials doped with RE 3+ (RE 3+ : rare earth) have structural disorders with a distribution of local cationic environments around the doping sites, which deviate from that of the ideal crystallographic positions. These materials attracted significant attention due to their novel structural characteristics and potential applications in various fields. , In particular, RE 3+ are added to the host matrices to enhance the luminescent properties. , PL spectroscopy is a very efficient tool for the evaluation of the order–disorder effects in semiconductors, which leads to a better understanding of the structural changes that take place in materials. In particular, the scheelite-type molybdates are interesting materials , due to their scientific significance, especially with respect to technological applications .…”

Section: Introductionmentioning

confidence: 99%

“…34,35 In particular, RE 3+ are added to the host matrices to enhance the luminescent properties. 19,36 PL spectroscopy is a very efficient tool for the evaluation of the order−disorder effects in semiconductors, which leads to a better understanding of the structural changes that take place in materials. In particular, the scheelite-type molybdates are interesting materials 37,38 due to their scientific significance, especially with respect to technological applications.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Figuring out such gases is an important aspect of ensuring human health. Many sensors have been made to detect these toxic gases, including electrochemical sensors, biosensors, surface acoustic wave sensors, and immunosensors, and among them, chemiresistive sensors have been developed as one of the most common established sensors due to their simplicity, rapid response, and low-cost of procurement. − The adsorption capacity of NH 3 increased while the NH 3 and O 2 mixture increased. To explain the sensing mechanism of unfunctionalized SiC-based composites, synergistic adsorption was used, where abundant unoccupied active sites can capture more gases.…”

Section: Introductionmentioning

confidence: 99%

Comparative and Efficient Ammonia Gas Sensing Study with Self-assembly-Synthesized Metal Oxide-SiC Fiber-Based Mesoporous SiO₂ Composites

et al. 2022

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Self-assembled-assisted ternary nanocomposite In2O3–SiC, CuO2–SiC, and MnO2–SiC semiconductors were mixed with SiO2 to enable gas sensing using cyclic voltammetry. The results of TEM (transm In2O3–SiC–SiO2 ion electron microscopy), X-ray diffraction spectroscopy, and Raman spectra analysis affirm the closeness of few layers between SiO2 and SiC in In2O3–SiC, MnO2–SiC, and CuO2–SiC. Among the electrochemical impedance spectra curves of the nanocomposites, none of the samples had a semicircle profile, which indicates the existence of a higher charge-transfer resistivity behavior between the electrolyte and the sample electrode with charge carrier and transport effects, which is related to the well-developed porous structure of synthesized composites. CuO2–SiC–SiO2 and MnO2–SiC–SiO2 showed high resistivity and a quite significant response for NH3 gas at room temperature. While there was a response for NH3 gas for In2O3–SiC–SiO2, the sensor showed a low response for the gas. From the sensing test, correspondences between the chemical structure of the sensor and the molecular structure of the gases have been found. The surface reactions between the sensor surface and the gas with a pore structure, along with the electron receiver/donor phase are observed from the results of gas sensor tests, and all factors are determining the precise state. Finally, the adsorption of NH3 molecules and the alteration of the electronic resistance of In2O3–SiC–SiO2, MnO2–SiC–SiO2, and CuO2–SiC–SiO2 were presented that include various thicknesses of charge to represent which are achieved by the connection with the substrates and the particles.

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Extensive studies of host lattices and activators in lanthanide phosphors based on efficient synthesis

Cited by 12 publications

References 31 publications

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

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

Comparative and Efficient Ammonia Gas Sensing Study with Self-assembly-Synthesized Metal Oxide-SiC Fiber-Based Mesoporous SiO₂ Composites

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Extensive studies of host lattices and activators in lanthanide phosphors based on efficient synthesis

Cited by 12 publications

References 31 publications

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

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

Comparative and Efficient Ammonia Gas Sensing Study with Self-assembly-Synthesized Metal Oxide-SiC Fiber-Based Mesoporous SiO2 Composites

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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

Comparative and Efficient Ammonia Gas Sensing Study with Self-assembly-Synthesized Metal Oxide-SiC Fiber-Based Mesoporous SiO₂ Composites