Luminescence properties of a new red emitting Eu3+-doped alkaline-earth fluoborate phosphor: BaCa(1-2x)BO3F:xEu3+, xM+ (M=Li, Na, K)

Sun, Jiayue; Lai, Jinli; Sun, Jianfeng; Du, Haiyan

doi:10.1016/s1002-0721(10)60452-8

Cited by 15 publications

(4 citation statements)

References 15 publications

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“…Though it is generally reported that alkali codoping enhances PL intensity, the intensity of emission decreased in ZnTa 2 O 6 :Pr 3+ while the emission lifetimes increased. Enhancements in emission were reported to be best upon Na + doping in CaSb 2 O 6 :Bi 3+ and BaCaBO 3 F:Eu 3+ , while Li + has been found to be a better alkali charge compensator in the case of Ca 6 Ba(PO 4 ) 4 O:Ce 3+ and Ca 3 Ti 2 O 7 :Eu 3+ . K + doping was found to enhance the emission more distinctly in comparison to other alkali ions in the case of BaMoO 4 :Pr 3+ .…”

Section: Introductionmentioning

confidence: 94%

Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

et al. 2018

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Studies have been carried out to understand the specific role of the alkali charge compensator on the luminescence properties of an alkali ion (Li, Na, and K) codoped SrWO:Eu phosphor. The oxidation state of the europium ion was found to be +3 on the basis of X-ray absorption near edge structure (XANES) measurements. This is the first report of its kind where opposite effects of Li ion and Na/K ions on photoluminescence intensity have been observed. Li ion codoping enhanced the photoluminescence intensity from SrWO:Eu phosphor while Na/K ion codoping did not. On the other hand, the luminescence lifetime is maximum for the Na ion codoped sample and minimum for the Li ion codoped sample. The results could be explained successfully using time-resolved luminescence, positron annihilation lifetime spectroscopy (PALS), and extended X-ray absorption fine structure (EXAFS) spectroscopy measurements. Changes in the Eu-O bond length and Debye-Waller Factor (σ) upon Li/Na/K codoping were monitored through EXAFS measurements. PALS also highlighted the fact that Li codoping is not contributing to reduction in the cation vacancies and might be occupying interstitial sites rather than lattice positions due to its very small size. On europium doping there is lowering in symmetry of SrO polyhedra from S to C, which is reflected in an intense electric dipole transition in comparison to the magnetic dipole transition. This is also corroborated using trends in Judd-Ofelt parameters. The results have shown that the luminescence lifetime is better when the vacancy concentration is lower as induced by Na and K codoping, while the emission intensity is higher in the samples when distortion around Eu is reduced as induced by Li codoping.

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Section: Introductionmentioning

confidence: 94%

Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

et al. 2018

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“…25−28 The effect of the other alkali cations (Na + and K + ) on the photoluminescence of the pyrochlores has not been known. Among other systems, enhancement in photoluminescence for the Ba-Ca 1−2x BO 3 F:xEu 3+ , xM + (M = Li, Na, and K) 29 and BaMoO 4 :Pr 3+30 phosphors was detected upon Na + and K + doping, respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

Structural, Optical, Luminescence, and Electrical Properties of Eu/Li- and Eu/Na-Codoped Magnesium Bismuth Niobate Pyrochlores

et al. 2022

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Eu-doped bismuth-based Bi1.5 M 0.4Mg0.5Nb1.5O7−δ (M = Li and Na) pyrochlores were synthesized by the organic–inorganic precursor combustion technique. The study examined the effect of rare earth element Eu3+ doping on the structural, dielectric, optical, and luminescence properties of synthesized materials. The analysis showed that the substitution of Bi3+ cations with Eu3+ leads to dielectric permittivity decreasing due to the structural distortion for the Eu-concentrated compositions and low polarizability of Eu3+. The band gap values predicted by electronic band structure calculation using DFT-HSE03 are in line with the experimental ones and tended to increase with the decrease in the unit cell parameters with Eu concentration changing. By the optical and luminescence measurements, the specific roles of Li- and Na-containing host types, additional phases, and dopant concentration in bismuth niobate pyrochlores are shown concerning the dielectric, structural, and Eu3+ emission properties. All Eu-doped bismuth-based pyrochlore ceramics behave as high-frequency dielectrics up to 200 °C and have mixed conductivity (electronic, proton, and oxygen) at T > 200 °C. The obtained dielectric parameters make them suitable for high-frequency ceramic capacitors.

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“…A red phosphor with high absorption in the near-UV/blue spectral region, that also offers chemical stability and low cost, is urgently needed for UV LEDs. [8][9][10][11][12][13] Compared with sulfide-based phosphors, silicate-based phosphors have been found to be more chemically and thermally stable, and lower in cost. Therefore, in recent years silicate-based luminescent materials have become a research hotspot, and many studies on phosphors with a silicate as the host have been conducted.…”

Section: Introductionmentioning

confidence: 99%

Effects of Li⁺on photoluminescence of Sr₃SiO₅: Sm³⁺red phosphor

Zhang¹,

Xu²,

Qiu³

et al. 2013

Chinese Phys. B

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The structure and photoluminescence (PL) properties of Sr3SiO5: Sm3+ and Li+-doped Sr3SiO5: Sm3+ red-emitting phosphors were investigated. Samples were prepared by the high-temperature solid-state method. PL spectra show that the concentration quenching occurs when the Sm3+ concentration is beyond 1.3 mol% in Sr3SiO5: Sm3+ phosphor without doping Li+ ions. The concentration-quenching mechanism can be explained by the electric dipole—dipole interaction of Sm3+ ions. The incorporation of Li+ ions into Sr3SiO5: Sm3+ phosphors, as a charge compensator, improves the PL properties. The lithium ions also suppress the concentration quenching in Sm3+ with concentration increased from 1.3 mol% to 1.7 mol%.

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Luminescence properties of a new red emitting Eu3+-doped alkaline-earth fluoborate phosphor: BaCa(1-2x)BO3F:xEu3+, xM+ (M=Li, Na, K)

Cited by 15 publications

References 15 publications

Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Structural, Optical, Luminescence, and Electrical Properties of Eu/Li- and Eu/Na-Codoped Magnesium Bismuth Niobate Pyrochlores

Effects of Li⁺on photoluminescence of Sr₃SiO₅: Sm³⁺red phosphor

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Luminescence properties of a new red emitting Eu3+-doped alkaline-earth fluoborate phosphor: BaCa(1-2x)BO3F:xEu3+, xM+ (M=Li, Na, K)

Cited by 15 publications

References 15 publications

Deciphering the Role of Charge Compensator in Optical Properties of SrWO4:Eu3+:A (A = Li+, Na+, K+): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Deciphering the Role of Charge Compensator in Optical Properties of SrWO4:Eu3+:A (A = Li+, Na+, K+): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Structural, Optical, Luminescence, and Electrical Properties of Eu/Li- and Eu/Na-Codoped Magnesium Bismuth Niobate Pyrochlores

Effects of Li+on photoluminescence of Sr3SiO5: Sm3+red phosphor

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Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Effects of Li⁺on photoluminescence of Sr₃SiO₅: Sm³⁺red phosphor