Synthesis and photoluminescence properties of new garnet-type red-emitting Li7La3-Zr2O12:xEu3+ phosphors

Park, K.; Hakeem, D.A.; Kim, D.H.; Jung, Gregor; Kim, S.W.

doi:10.1016/j.scriptamat.2019.12.039

Cited by 34 publications

(4 citation statements)

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“…The substitution of some lanthanum ions for cubic phase stabilization is the less common method of LLZ doping. The results of LLZ doping with divalent, trivalent, and tetravalent ions over the sublattice of trivalent lanthanum are presented in the literature [ 60 , 61 , 62 , 63 , 64 ]; see Figure 5 .…”

Section: Resultsmentioning

confidence: 99%

Section: La Sublatticementioning

confidence: 99%

“…Li 7 La 2.75 Y 0.25 Zr 2 O 12 solid electrolyte has high density and maximum value of lithium-ion conductivity-3.21 × 10 −4 S/cm at 30 • C. Such high lithiumion conductivity values of Y-doped LLZ are caused by the fact that this dopant element also acts as a sintering aid, which leads to sample densification and, as a result, total conductivity growth. Park et al [62] synthesized Li 7 La 3−x Zr 2 O 12 -xEu 3+ (0.02 ≤ x ≤ 0.10) solid electrolytes using the solid-state method. Stabilization of the cubic phase has not been achieved; the samples were a mixture of tetragonal and cubic modifications.…”

Section: La Sublatticementioning

confidence: 99%

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Recent Strategies for Lithium-Ion Conductivity Improvement in Li7La3Zr2O12 Solid Electrolytes

Il’ina

2023

IJMS

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The development of solid electrolytes with high conductivity is one of the key factors in the creation of new power-generation sources. Lithium-ion solid electrolytes based on Li7La3Zr2O12 (LLZ) with a garnet structure are in great demand for all-solid-state battery production. Li7La3Zr2O12 has two structural modifications: tetragonal (I41/acd) and cubic (Ia3d). A doping strategy is proposed for the stabilization of highly conductive cubic Li7La3Zr2O12. The structure features, density, and microstructure of the ceramic membrane are caused by the doping strategy and synthesis method of the solid electrolyte. The influence of different dopants on the stabilization of the cubic phase and conductivity improvement of solid electrolytes based on Li7La3Zr2O12 is discussed in the presented review. For mono-doping, the highest values of lithium-ion conductivity (~10−3 S/cm at room temperature) are achieved for solid electrolytes with the partial substitution of Li+ by Ga3+, and Zr4+ by Te6+. Moreover, the positive effect of double elements doping on the Zr site in Li7La3Zr2O12 is established. There is an increase in the popularity of dual- and multi-doping on several Li7La3Zr2O12 sublattices. Such a strategy leads not only to lithium-ion conductivity improvement but also to the reduction of annealing temperature and the amount of some high-cost dopant. Al and Ga proved to be effective co-doping elements for the simultaneous substitution in Li/Zr and Li/La sublattices of Li7La3Zr2O12 for improving the lithium-ion conductivity of solid electrolytes.

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Section: Resultsmentioning

confidence: 99%

Section: La Sublatticementioning

confidence: 99%

Section: La Sublatticementioning

confidence: 99%

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Recent Strategies for Lithium-Ion Conductivity Improvement in Li7La3Zr2O12 Solid Electrolytes

Il’ina

2023

IJMS

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“…These coordinates are situated in the orange-red region and are close to those of the standard red (0.66, 0.33). The color purity is determined using the formula: 51 where x i and y i represent the standard white coordinates (0.33, 0.33) and x d and y d are the standard red light chromaticity coordinates (0.66, 0.33), while x and y are the chromaticity coordinates of phosphors in the CIE diagram. The corresponding chromaticity parameters of C 4.75 PSO:0.1Sm 3+ ,0.15A + samples are listed in Table 3.…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence enhancement of orange-emitting Ca₅(PO₄)₂SiO₄:Sm³⁺ phosphor through charge compensation of A⁺ (Li⁺, Na⁺ and K⁺) ions for white light-emitting diodes

Xiong

Yuan

et al. 2022

Dalton Trans.

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Effects of synthesis methods and different concentrations of Eu³⁺ ions on the emission properties of Sr₂SiO₄ phosphors

Chen

Yang

et al. 2021

Luminescence

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Sr 2-x SiO 4 -xEu (x = 0.01, 0.02, 0.035, and 0.05) phosphors were synthesized at 1000-1,300 C for 2 h in two different processes, the solid-state reaction (SSR) method and a two-step (TS) method, and these results revealed three important findings. The secondary Sr 3 SiO 5 phase was observed in 1,300 C-TS-synthesized Sr 2-x SiO 4 -xEu powder, but no raw materials or secondary phases were observed in the SSR-prepared Sr 2-x SiO 4 -xEu powders. The concentration quenching effect of Eu 3+ ions was really observed in TS-prepared Sr 2-x SiO 4 -xEu phosphors, which was not observed in SSR-prepared Sr 2-x SiO 4 -xEu phosphors. High emission intensity of charge transition state (CT) band was observed in the photoluminescence excitation spectra, for that the 265 and 393 nm were used as the excitation wavelengths of Sr 2-x SiO 4 -xEu phosphors. Sr 2-x SiO 4 -xEu phosphors under different synthesis processes and excitation wavelengths would have different main emission peaks in the photoluminescence emission spectra. In this study, we also well discussed and explored the relationships of photoluminescence properties with the dipole transitions (electric or magnetic) of Eu 3+ ions and the different coordination structures of Sr +2 ions. K E Y W O R D S charge transition state, concentration quenching effect, different synthesis processes, Sr 2-x SiO 4 -xEu phosphors 1 | INTRODUCTION Inorganic luminescent materials have been investigated as practical applications in many display devices, for example, flat panel screens and field emission displays. Recently, considerable efforts have been devoted to investigate materials with different emission properties,which can be used for WLEDs and optical storage devices. [1,2] As being compared with traditional incandescent and fluorescent lamps, WLEDs have the advantages of high brightness, dependability, long life-time, low power consumption, lack of toxic mercury, and environmental friendliness. [3] For that, WLEDs are promising devices for solid-state lighting and liquid-crystal display backlights because of their excellent properties. More researchers pay attention to developing phosphors and applying them to fabricate WLEDs with different emission methods. Accordingly, the investigations of highperformance phosphors with the properties of blue-light excitability, high quantum efficiency, and small thermal quenching are vital.Many methods are currently used to produce WLEDs, including combining blue LEDs with a yellow phosphor material, combining blue LEDs with the green and red phosphors, using UV-LEDs combined

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Synthesis and photoluminescence properties of new garnet-type red-emitting Li7La3-Zr2O12:xEu3+ phosphors

Cited by 34 publications

References 36 publications

Recent Strategies for Lithium-Ion Conductivity Improvement in Li7La3Zr2O12 Solid Electrolytes

Recent Strategies for Lithium-Ion Conductivity Improvement in Li7La3Zr2O12 Solid Electrolytes

Photoluminescence enhancement of orange-emitting Ca₅(PO₄)₂SiO₄:Sm³⁺ phosphor through charge compensation of A⁺ (Li⁺, Na⁺ and K⁺) ions for white light-emitting diodes

Effects of synthesis methods and different concentrations of Eu³⁺ ions on the emission properties of Sr₂SiO₄ phosphors

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Synthesis and photoluminescence properties of new garnet-type red-emitting Li7La3-Zr2O12:xEu3+ phosphors

Cited by 34 publications

References 36 publications

Recent Strategies for Lithium-Ion Conductivity Improvement in Li7La3Zr2O12 Solid Electrolytes

Recent Strategies for Lithium-Ion Conductivity Improvement in Li7La3Zr2O12 Solid Electrolytes

Photoluminescence enhancement of orange-emitting Ca5(PO4)2SiO4:Sm3+ phosphor through charge compensation of A+ (Li+, Na+ and K+) ions for white light-emitting diodes

Effects of synthesis methods and different concentrations of Eu3+ ions on the emission properties of Sr2SiO4 phosphors

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Photoluminescence enhancement of orange-emitting Ca₅(PO₄)₂SiO₄:Sm³⁺ phosphor through charge compensation of A⁺ (Li⁺, Na⁺ and K⁺) ions for white light-emitting diodes

Effects of synthesis methods and different concentrations of Eu³⁺ ions on the emission properties of Sr₂SiO₄ phosphors