Powder synthesis and luminescence properties of green emitting Ba2LiSi7-xAlxN12-xOx:Eu2+ phosphor

Takeda, Takashi; Kato, Kousuke; Kiyono, Hajime; Hirosaki, Naoto

doi:10.1016/j.jallcom.2020.156358

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…It is feasible to remove some surface substances and defects by the AP process to improve the luminescence intensity of the CTO:0.02Er 3+ / 0.04Yb 3+ phosphor as shown in Figure 3a. 41 EDS tests were performed on the CTO-MSS and CTO-MSS-AP samples, which are shown in Figure S1 (Supporting Data). EDS results showed that Er 3+ /Yb 3+ replaced Ca 2+ sites, and the ratio of the total atomic number of Er, Yb, and Ca to the atomic number of Ta was about 1:4.…”

Section: Resultsmentioning

confidence: 99%

“…After the AP process, the surface of the SSR and MSS particles becomes flatter with clear contrast by comparing Figures a with c and b with d, respectively. It is feasible to remove some surface substances and defects by the AP process to improve the luminescence intensity of the CTO:0.02Er 3+ /0.04Yb 3+ phosphor as shown in Figure a . EDS tests were performed on the CTO-MSS and CTO-MSS-AP samples, which are shown in Figure S1 (Supporting Data).…”

Section: Resultsmentioning

confidence: 99%

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Molten Salt Synthesized CaTa₄O₁₁:Er³⁺/Yb³⁺ with Superior Upconversion Luminescence

Wang,

Cao,

Mao

et al. 2024

Inorg. Chem.

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Low phonon tantalate-based phosphors with a layer structure are considered to have excellent upconversion luminescence (UCL) intensity, which could be reduced due to the existence of impure phase defects and inappropriate doped rare earth ions. To improve their UCL performance, we have prepared single-phase CaTa4O11:Er3+/Yb3+ samples by a molten salt synthesis (MSS) using KCl as the reaction medium and compared its UCL properties with counterparts made by a conventional solid-state reaction (SSR) in this study. We have demonstrated that the MSS samples have a much higher UCL intensity under 980 nm laser excitation than the SSR ones due to accurate replacement of Ca2+ sites by Er3+/Yb3+ in high-purity single-phase MSS samples. We have further enhanced the green UCL intensity of the MSS samples by 1.57 times via acid picking (AP). Under 980 nm laser excitation at a high powder density of 61.3 W/cm2, the green UCL intensity of the MSS-AP samples can reach 3.72 times that of the SSR-AP samples. For potential luminescence thermometry applications, the maximum absolute sensitivity (S A) of the MSS-AP samples reaches 0.01316 K–1 at 501 K based on the luminescence intensity ratio. This study shows that CaTa4O11:Er3+/Yb3+ phosphors prepared by the MSS method are single-phase samples with excellent pure green UCL as a suitable temperature sensing material.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Molten Salt Synthesized CaTa₄O₁₁:Er³⁺/Yb³⁺ with Superior Upconversion Luminescence

Wang,

Cao,

Mao

et al. 2024

Inorg. Chem.

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“…36,37,[40][41][42] The PL spectra of Eu 3+ -doped CNYP-I (0 ≤ x ≤ 1/2) and CNYP-II (0 ≤ y ≤ 1) compounds under 395 nm excitation show several sharp peaks, corresponding to 5 D 0 -7 F 0 (578 nm), 5 D 0 -7 F 1 (590 nm), 5 D 0 -7 F 2 (612 nm), 5 D 0 -7 F 3 (652 nm), and 5 D 0 -7 F 4 (698 nm) Eu 3+ transitions, respectively (shown in Figure 5B). [43][44][45][46][47] Figure 5C depicts the diagram of energy level related to Eu 3+ ions. The transition of excited Eu 3+ electrons from the 7F ground-state to the 5D, 5L, and 5H excited-states occurred.…”

Section: Photoluminescence Propertiesmentioning

confidence: 99%

The composition engineering of red‐emitting Eu³⁺‐doped Ca_10.5(PO₄)₇‐type solid solution phosphors and application in LED

Wang

Huang

et al. 2021

J. Am. Ceram. Soc.

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In this work, using Ca 10.5 (PO 4 ) 7 as the structural model, a number of Eu 3+ -doped [Ca 9 Na 3x Y 1-x (PO 4 ) 7 (CNYP-I, 0 ≤ x ≤ 1/2) ← Ca 10.5 (PO 4 ) 7 → Ca 9+y Na 3/2-y/2 Y (1-y)/2 (PO 4 ) 7 (CNYP-II, 0 ≤ y ≤ 1)] phosphors were designed and synthesized through the heterovalent substitution of Y 3+ and Na + to Ca 2+ . The substitution mechanism, composition structure, luminescence performance, and thermal stability of Eu 3+ -doped CNYP-I (0 ≤ x ≤ 1/2) as well as the solid solutions of CNYP-II (0 ≤ y ≤ 1), were discussed in detail. The morphology and element composition of CNYP-I (0 ≤ x ≤ 1/2) and CNYP-II (0 ≤ y ≤ 1) solid solutions were analyzed by SEM and EDS. The PL spectra of the specimens were containing the predominant red peak of emission at 612 nm caused via the transition of 5 D 0 -7 F 2 , indicating that Eu 3+ occupies the low-symmetry center. Moreover, the site symmetry Eu 3+ occupied changed with the x/y value. The luminous intensity of Eu 3+ -doped CNYP-I (0 ≤ x ≤ 1/2) and CNYP-II (0 ≤ y ≤ 1) phosphors at 150°C maintained about 60% of room temperature. The representative compound CNYP-I (x = 1/3) was used as the red phosphor to prepare a near-UV based white LEDs along with Ra of 80.9 and CCT of 4100 K.

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Studies on the structural, thermal and luminescence properties of Sr1−xZrSi2O7:xEu3+ phosphors for solid state lighting

Sahu,

Sahu

2024

Appl. Phys. A

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Powder synthesis and luminescence properties of green emitting Ba2LiSi7-xAlxN12-xOx:Eu2+ phosphor

Cited by 6 publications

References 31 publications

Molten Salt Synthesized CaTa₄O₁₁:Er³⁺/Yb³⁺ with Superior Upconversion Luminescence

Molten Salt Synthesized CaTa₄O₁₁:Er³⁺/Yb³⁺ with Superior Upconversion Luminescence

The composition engineering of red‐emitting Eu³⁺‐doped Ca_10.5(PO₄)₇‐type solid solution phosphors and application in LED

Studies on the structural, thermal and luminescence properties of Sr1−xZrSi2O7:xEu3+ phosphors for solid state lighting

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Powder synthesis and luminescence properties of green emitting Ba2LiSi7-xAlxN12-xOx:Eu2+ phosphor

Cited by 6 publications

References 31 publications

Molten Salt Synthesized CaTa4O11:Er3+/Yb3+ with Superior Upconversion Luminescence

Molten Salt Synthesized CaTa4O11:Er3+/Yb3+ with Superior Upconversion Luminescence

The composition engineering of red‐emitting Eu3+‐doped Ca10.5(PO4)7‐type solid solution phosphors and application in LED

Studies on the structural, thermal and luminescence properties of Sr1−xZrSi2O7:xEu3+ phosphors for solid state lighting

Contact Info

Product

Resources

About

Molten Salt Synthesized CaTa₄O₁₁:Er³⁺/Yb³⁺ with Superior Upconversion Luminescence

Molten Salt Synthesized CaTa₄O₁₁:Er³⁺/Yb³⁺ with Superior Upconversion Luminescence

The composition engineering of red‐emitting Eu³⁺‐doped Ca_10.5(PO₄)₇‐type solid solution phosphors and application in LED