Phase evolution and microwave dielectric properties of the Li2(1+x)ZnGe3O8 spinel oxides

Fang, Weishuang; Ao, Laiyuan; Tang, Ying; Li, Jie; Xiang, Huimin; Zhang, Zhiwei; Du, Qianbiao; Fang, Liang

doi:10.1007/s10854-020-03904-8

Cited by 4 publications

(1 citation statement)

References 40 publications

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“…The stretching vibration corresponds to the [WO 6 ] octahedrons reportedly becoming stronger due to the above substitution, as visible in the present case also. The other peaks in Figure a located around 450, 793, and 813 cm –1 can be assigned to the stretching vibration of [GeO 4 ] tetrahedrons and the peak at ∼830 cm –1 can be attributed to the stretching vibration of [AlO 4 ] tetrahedrons.…”

Section: Resultsmentioning

confidence: 99%

Enriching the Deep-Red Emission in (Mg, Ba)₃M₂GeO₈: Mn⁴⁺ (M = Al, Ga) Compositions for Light-Emitting Diodes

Kuttiat

Abraham

Kunti

et al. 2023

ACS Appl. Mater. Interfaces

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Red emission from Mn4+-containing oxides inspired the development of high color rendering and cost-effective white-light-emitting diodes (WLEDs). Aiming at this fact, a series of new crystallographic site modified (Mg, Ba)3M2GeO8: Mn4+ (M = Al, Ga) compositions were developed with strong deep-red emission in the reaction to UV and blue lights. The Mg3Al2GeO8 host is composed of three phases: orthorhombic-Mg3Ga2GeO8, orthorhombic-Mg2GeO4, and cubic-MgAl2O4. However, Mg3Ga2GeO8 secured an orthorhombic crystal structure. Interestingly, Mg3Al2GeO8: Mn4+ showed a 13-fold more intense emission than Mg3Ga2GeO8: Mn4+ since Mn4+ occupancy was preferable to [AlO6] sites compared to [GaO6]. The coexisting phases of MgAl2O4 and Mg2GeO4 in Mg3Al2GeO8: Mn4+ contributed to Mn4+ luminescence by providing additional [AlO6] and [MgO6] octahedrons for Mn4+ occupancy. Further, these sites reduced the natural reduction probability of Mn4+ to Mn2+ in [AlO4] tetrahedrons, which was confirmed using cathodoluminescence analysis for the first time. A cationic substitution strategy was employed on Mg3M2GeO8: Mn4+ to improve the luminescence, and Mg3–x Ba x M2GeO8: Mn4+ (M = Al, Ga) phosphors were synthesized. Partial substitution of larger Ba2+ ions in Mg2+ sites caused structural distortions and generated a new Ba impurity phase, which improved the photoluminescence. Compositionally tuned Mg2.73Ba0.27Al1.993GeO8: 0.005Mn4+ exhibited a 35-fold higher emission than that of Mg3Ga1.993GeO8: 0.005Mn4+. Additionally, this could retain 70% of its ambient emission intensity at 453 K. A warm WLED with a correlated color temperature (CCT) of 3730 K and a CRI of 89 was fabricated by combining the optimized red component with Y3Al5O12: Ce3+ and 410 nm blue LED. By tuning the ratio of blue (BaMgAl10O17: Eu2+), green (Ce0.63Tb0.37MgAl11O19), and red (Mg2.73Ba0.27Al2GeO8: 0.005Mn4+) phosphors, another WLED was developed using a 280 nm UV-LED chip. This showed natural white emission with a CRI of 79 and a CCT of 5306 K. Meanwhile, three red LEDs were also fabricated using the Mg2.73Ba0.27Al1.993GeO8: 0.005Mn4+ phosphor with commercial sources. These could be potential pc-LEDs for plant growth applications.

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Section: Resultsmentioning

confidence: 99%

Enriching the Deep-Red Emission in (Mg, Ba)₃M₂GeO₈: Mn⁴⁺ (M = Al, Ga) Compositions for Light-Emitting Diodes

Kuttiat

Abraham

Kunti

et al. 2023

ACS Appl. Mater. Interfaces

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Microstructural evolution, dielectric performance, and densification behavior of novel NaAGeO4 (A = Sm, Y) ceramics

Zhou

Wang

et al. 2022

Ceramics International

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Crystal structure, bond characterization and lattice energy of B-site 1:3 ordering inverse spinel Li1.25Ga0.25Ti1.5O4 ceramic

Zhang,

Chen,

Zhang

et al. 2024

Ceramics International

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Phase evolution and microwave dielectric properties of the Li2(1+x)ZnGe3O8 spinel oxides

Cited by 4 publications

References 40 publications

Enriching the Deep-Red Emission in (Mg, Ba)₃M₂GeO₈: Mn⁴⁺ (M = Al, Ga) Compositions for Light-Emitting Diodes

Enriching the Deep-Red Emission in (Mg, Ba)₃M₂GeO₈: Mn⁴⁺ (M = Al, Ga) Compositions for Light-Emitting Diodes

Microstructural evolution, dielectric performance, and densification behavior of novel NaAGeO4 (A = Sm, Y) ceramics

Crystal structure, bond characterization and lattice energy of B-site 1:3 ordering inverse spinel Li1.25Ga0.25Ti1.5O4 ceramic

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Phase evolution and microwave dielectric properties of the Li2(1+x)ZnGe3O8 spinel oxides

Cited by 4 publications

References 40 publications

Enriching the Deep-Red Emission in (Mg, Ba)3M2GeO8: Mn4+ (M = Al, Ga) Compositions for Light-Emitting Diodes

Enriching the Deep-Red Emission in (Mg, Ba)3M2GeO8: Mn4+ (M = Al, Ga) Compositions for Light-Emitting Diodes

Microstructural evolution, dielectric performance, and densification behavior of novel NaAGeO4 (A = Sm, Y) ceramics

Crystal structure, bond characterization and lattice energy of B-site 1:3 ordering inverse spinel Li1.25Ga0.25Ti1.5O4 ceramic

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Enriching the Deep-Red Emission in (Mg, Ba)₃M₂GeO₈: Mn⁴⁺ (M = Al, Ga) Compositions for Light-Emitting Diodes

Enriching the Deep-Red Emission in (Mg, Ba)₃M₂GeO₈: Mn⁴⁺ (M = Al, Ga) Compositions for Light-Emitting Diodes