Regulating anti-site defects in MgGa2O4:Mn4+ through Mg2+/Ge4+ doping to greatly enhance broadband red emission for plant cultivation

Wu, Haining; Zhu, Qi; Sun, Xudong; Li, Ji‐Guang

doi:10.1016/j.jmrt.2021.04.045

Cited by 20 publications

(8 citation statements)

References 67 publications

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“…The fitting peak of Mg 1s is shown in Figure b; the peaks of Mg 2+ at ∼1306.4 and ∼1303.5 eV belong to [MgO 6 ] and [MgO 4 ], respectively. In addition, the observed asymmetric XPS peaks are due to Mg 2+ occupying both octahedral and tetrahedral positions in the structure, which is attributed to the antispinel structure, resulting in both larger and smaller band energy peaks . Similarly, the Mg 2p XPS spectrum shown in Figure c is also not symmetric and consists of two peaks.…”

Section: Resultsmentioning

confidence: 93%

“…In theory, the MgGa 2 O 4 crystal structure includes the angular-connected [GaO 6 ] octahedron and the [MgO 4 ] tetrahedron. With high-temperature sintering, the crystal will appear an inverse spinel structure . Mg 2+ ion (CN = 4, r = 0.57 Å; CN = 6, r = 0.72 Å) will occupy two cation sites in the meantime, forming the polyhedra [MgO 6 ] and [MgO 4 ].…”

Section: Resultsmentioning

confidence: 99%

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Low Temperature Sintering, Structure and Microwave Dielectric Properties of Novel (1 – x)MgGa₂O₄–xCuMoO₄ Ceramics for LTCC Applications

Lyu

Ren

Xin

et al. 2023

ACS Sustainable Chem. Eng.

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Fabrication of low-temperature co-fired ceramic (LTCC) densified at a low sintering temperature (<900 °C) is energy saving and environmentally friendly. Here, an interesting attempt has been made to lower the sintering temperature of MgGa2O4 by adding CuMoO4 for LTCC application. The sintering temperature of MgGa2O4 was remarkably reduced from 1410 to 900 °C, which contributed to energy saving. Furthermore, a series of studies on microstructure, sintering behavior, lattice parameters, and microwave dielectric characteristic of the samples were carried out. The occurrence of ion substitution between MgGa2O4 and CuMoO4, which affected the sintering densification, ionic polarizability, and Mg–O bond length, made the composites present various sintering and dielectric properties. Moreover, the full width half maximum (FWHM) value of the T2g peak in Raman spectra and lattice distortion were also analyzed to reveal the intrinsic interaction between structure and dielectric properties. Finally, the 0.5MgGa2O4–0.5CuMoO4 ceramics sintered at 900 °C showed the best comprehensive performance, εr = 6.8, Q × f = 15,800 GHz, τf = −54.2 ppm/°C. These promising properties make the composite more suitable for practical application.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Low Temperature Sintering, Structure and Microwave Dielectric Properties of Novel (1 – x)MgGa₂O₄–xCuMoO₄ Ceramics for LTCC Applications

Lyu

Ren

Xin

et al. 2023

ACS Sustainable Chem. Eng.

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“…K 7 ZnSc 2 B 15 O 30 :Mn 2+ shows two emissions peaked at 584 nm and 675 nm due to the divalent Mn doping into the Zn 2+ and Sc 3+ sites in the host [ 82 ]. MgGa 2 O 4 :Mn 4+ exhibits asymmetric emission due to the tetravalent Mn doping into the Mg 2+ and Ga 3+ sites, whose emission bands can be divided into two sub-bands centered at 674 nm and 710 nm, respectively [ 83 ]. Incorporating Mg 2+ /Ge 4+ regulates the Mg/Ga anti-site in the lattice, resulting in the improvement of emission intensity by 1.6 times for Mg 2.7 Ga 2.6 Ge 0.7 O 8 :Mn 4+ with a FWHM of 69 nm.…”

Section: Multi-site Luminescence Of Phosphorsmentioning

confidence: 99%

Recent Advances in Multi-Site Luminescent Materials: Design, Identification and Regulation

2023

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The development of novel phosphor materials with excellent performance and modification of their photoluminescence to meet the higher requirements for applications are the essential research subjects for luminescent materials. Multi-site luminescent materials with crystallographic sites for the activator ions that broaden the tunable range of luminescent spectra and even enhance the luminescent performance have attracted significant attention in the pursuit of high-quality luminescence for white light-emitting diodes. Here, we summarize multi-site luminescence characteristics based on the different kinds of host and activator ions, introduce the identifications of multi-site activator ions via optical analysis, provide a structural analysis and theoretical calculation methods, and introduce the regulation strategies and advance applications of multi-site phosphors. The review reveals the relationship between crystal structure and luminescent properties and discusses future opportunities for multi-site phosphors. This will provide guidance for the design and development of luminescent materials or other materials science.

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“…2 Phytochrome participates in the establishment of the photomorphogenesis of plants, regulates their growth, and affects their morphogenesis throughout their life. 3 The absorption spectra of phytochrome are located at around 660 nm in the red region (Pr 600-700 nm) and approximately 730 nm in the far-red region (Pfr 600-780 nm). 4 The flowering of plants is also affected by the ratio of phytochromes Pfr and Pr.…”

Section: Introductionmentioning

confidence: 99%

“…The absorption spectra of chlorophyll a and b are mainly concentrated on blue (400–500 nm) and red light (590–690 nm), which significantly affect photosynthesis 2 . Phytochrome participates in the establishment of the photomorphogenesis of plants, regulates their growth, and affects their morphogenesis throughout their life 3 . The absorption spectra of phytochrome are located at around 660 nm in the red region (Pr 600–700 nm) and approximately 730 nm in the far‐red region (Pfr 600‐780 nm) 4 .…”

Section: Introductionmentioning

confidence: 99%

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

et al. 2021

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High‐efficiency and far‐red light phosphors based on Mn4+‐doped inorganic luminescence materials are beneficial to plant cultivation. However, Mn4+‐doped oxide phosphors have a common problem of low quantum efficiency. Alkali metal ion codoping can effectively improve the luminescence properties of Mn4+‐activated oxide phosphors. Herein, a series of Sr2InSbO6:Mn4+, M (SISO:Mn4+, M) (M = Li+, Na+, and K+) far‐red‐emitting phosphors codoped alkali metal ions were first synthesized. Density functional theory calculation indicated that SISO is a kind of indirect bandgap material with a bandgap of ∼1.60 eV. The SISO:Mn4+ samples showed a far‐red light at 698 nm upon 365 nm, which perfectly matched the absorption spectrum of the far‐red‐phytochrome (Pfr) of plants. The doping concentration of the SISO:Mn4+ samples was optimized to be 0.006 mol. The concentration quenching mechanism was defined as dipole–dipole interaction by combining the Dexter theory and the Inokuti–Hirayama model. Optimizing the sintering temperature and codoped with alkali metal ions (Li+, Na+, and K+) could improve the luminescent intensity of SISO:Mn4+. The optimum sintering temperature was 1300°C. The internal quantum efficiencies of SISO:0.006Mn4+ and SISO:0.006Mn4+, 0.006Li+ phosphors are 22.67% and 60.56%, respectively. SISO:Mn4+, Li+ phosphors‐based plant growth light‐emitting diodes (LEDs) demonstrate excellent optical stability and long lifetime. Thus, these phosphors are promising candidates for plant cultivation LEDs.

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Regulating anti-site defects in MgGa2O4:Mn4+ through Mg2+/Ge4+ doping to greatly enhance broadband red emission for plant cultivation

Cited by 20 publications

References 67 publications

Low Temperature Sintering, Structure and Microwave Dielectric Properties of Novel (1 – x)MgGa₂O₄–xCuMoO₄ Ceramics for LTCC Applications

Low Temperature Sintering, Structure and Microwave Dielectric Properties of Novel (1 – x)MgGa₂O₄–xCuMoO₄ Ceramics for LTCC Applications

Recent Advances in Multi-Site Luminescent Materials: Design, Identification and Regulation

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

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Regulating anti-site defects in MgGa2O4:Mn4+ through Mg2+/Ge4+ doping to greatly enhance broadband red emission for plant cultivation

Cited by 20 publications

References 67 publications

Low Temperature Sintering, Structure and Microwave Dielectric Properties of Novel (1 – x)MgGa2O4–xCuMoO4 Ceramics for LTCC Applications

Low Temperature Sintering, Structure and Microwave Dielectric Properties of Novel (1 – x)MgGa2O4–xCuMoO4 Ceramics for LTCC Applications

Recent Advances in Multi-Site Luminescent Materials: Design, Identification and Regulation

An efficient far‐red emission Sr2InSbO6:Mn4+, M (M = Li+, Na+, and K+) phosphors for plant cultivation LEDs

Contact Info

Product

Resources

About

Low Temperature Sintering, Structure and Microwave Dielectric Properties of Novel (1 – x)MgGa₂O₄–xCuMoO₄ Ceramics for LTCC Applications

Low Temperature Sintering, Structure and Microwave Dielectric Properties of Novel (1 – x)MgGa₂O₄–xCuMoO₄ Ceramics for LTCC Applications

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs