KGd(MoO4)2:Eu3+ as a promising red phosphor for light-emitting diode application

Yi, Linghong; Zhou, Liya; Wang, Zhengliang; Sun, Jianhua; Gong, Fuzhong; Wan, Weiping; Wang, Wei

doi:10.1016/j.cap.2009.05.025

Cited by 28 publications

(7 citation statements)

References 16 publications

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“…The structure can accommodate a variety of chemical species in both A-and B-cation sublattices, which gives rise to a plethora of different compounds with a general composition (A',A'')a[(B',B'')O4]b, where A', A'' can be alkali, alkali-earth or rare-earth cations and B', B'' are typically W 6+ , Mo 6+ or other cations with tetrahedral coordination. Scheelites containing rare-earth cations demonstrate luminescent properties and can be used in pc-WLEDs (phosphor-converted white-light-emitting-diode) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of cation vacancies on the crystal structure and luminescent properties of Ca 0.85−1.5x Gd x Eu 0.1 □ 0.05+0.5x WO 4 (0 ≤ x ≤ 0.567) scheelite-based red phosphors

Batuk

Морозов

et al. 2017

Journal of Alloys and Compounds

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The Ca0.85-1.5xGdxEu0.10.05+0.5xWO4 (0 ≤ x ≤ 0.567) series of cation-deficient scheelites is investigated to unveil the influence of the cation vacancies on the crystal structure and luminescent properties. The concentration of the vacancies is varied by the heterovalent substitution of Gd 3+ for Ca 2+ , keeping the concentration of the Eu 3+ luminescent centers constant in all compounds of the series. The crystal structure of the materials is studied using a combination of transmission electron microscopy and synchrotron X-ray powder diffraction. However, the difference in the local coordination environment of the A cation species noticeably affects the line width and the multiplet splitting of the 4f 6 -4f 6 transitions.

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Section: Introductionmentioning

confidence: 99%

Effect of cation vacancies on the crystal structure and luminescent properties of Ca 0.85−1.5x Gd x Eu 0.1 □ 0.05+0.5x WO 4 (0 ≤ x ≤ 0.567) scheelite-based red phosphors

Batuk

Морозов

et al. 2017

Journal of Alloys and Compounds

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“…The excitation spectra of Eu 3+ ions of the La 2 O 2 S:Eu 3+ (Ln = Sm, La, Gd, and Y) compound arise from the transition of Eu 3+ , and the peak is around 394 nm. The emission lines around 627 nm corresponded to transitions of 5 D 0 to 7 F 2 energy levels, where the emission peak at around 627 mm was strongest, which is due to Eu 3+ ions possessing the lattice positions of an asymmetric center in the crystal. − The results show that the Eu 3+ doped with four kinds of rare-earth luminescent materials of Ln 2 O 2 S (Ln = Sm, La, Gd, and Y), and can emit red light with both good monochromaticity and greater intensity. This result found that the composite substrate material is more advantageous for doping with Eu 3+ , and its luminous property is more exceptional.…”

Section: Resultsmentioning

confidence: 86%

Rapid Production of Ln₂O₂S:Eu³⁺/Tb³⁺ (Ln = Sm, La, Gd, and Y) Phosphors by Molten Salt Electrolysis

Liu

Jing

Wang

et al. 2018

ACS Appl. Energy Mater.

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In this paper, a facile one-pot molten salt electrolysis method has been proposed for the synthesis of hexagonal sheet-like Ln 2 O 2 S:Eu 3+ /Tb 3+ (Ln = Sm, La, Gd and Y) phosphors. The phase, composition, morphology, and optical properties of the phosphors were characterized by X-ray powder diffraction (XRD), high-resolution transmission electron microscope (HRTEM), and photoluminescence. The results showed that doping Eu 3+ or Tb 3+ causes no great changes to the crystal structure. Under the excitation of 394 nm light, sheet-like Ln 2 O 2 S:Eu 3+ (Ln = Sm, La, Gd, and Y) exhibited predominantly red emission at around 627 nm, which corresponds to the absorption of host crystals and the energy level transitions of 5 D 0 to 7 F 2 configuration of Eu 3+ ions. The sheet-like Ln 2 O 2 S:Tb 3+ exhibited characteristic excitation of Tb 3+ under 364 nm. The emission spectra of Ln 2 O 2 S:Tb 3+ (Ln = Sm, La, Gd, and Y) were measured, and those emission lines between 450 and 650 nm corresponded to the transitions of 5 D 4 to 7 F J (J = 0−6) ground state energy levels which belonged to the characteristic emission of Tb 3+ . The fabrication mechanism of the sheet-like Ln 2 O 2 S:Eu 3+ /Tb 3+ (Ln = Sm, La, Gd, and Y) was also investigated. This approach provides new avenues for the preparation of phosphors for applications in light-storing fields.

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“…Some scheelite-type compounds, such as PbMoO 4 , KGd(WO 4 ) 2 , NaBi(WO 4 ) 2 and M WO 4 ( M = Pb, Cd, Ca) are well-known and used, while other MLn ( B O 4 ) 2 ( M = Li, Na, K, Ag; Ln = lanthanides, B = W, Mo) materials with Eu 3+ cations are frequently suggested as red phosphors for WLEDs. For example, NaEu(WO 4 ) 2 and KGd 0.75 Eu 0.25 (MoO 4 ) 2 show strong, saturated red emission. , …”

Section: Introductionmentioning

confidence: 99%

“…For example, NaEu(WO 4 ) 2 and KGd 0.75 Eu 0.25 (MoO 4 ) 2 show strong, saturated red emission. 9,10 The scheelite-type ABO 4 (CaWO 4 ) structure is built from columns of [...-AO 8 -BO 4 -...] directed along the c-axis. The AO 8 polyhedra and BO 4 tetrahedra form a 3D framework by sharing common vertices.…”

Section: Introductionmentioning

confidence: 99%

KEu(MoO₄)₂: Polymorphism, Structures, and Luminescent Properties

et al. 2015

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In this paper, with the example of two different polymorphs of KEu(MoO 4 ) 2 , the influence of the ordering of the A-cations on the luminescent properties in scheelite related compounds (A′,A″) n [(B′,B″)O 4 ] m is investigated. The polymorphs were synthesized using a solid state method. The study confirmed the existence of only two polymorphic forms at annealing temperature range 923−1203 K and ambient pressure: a low temperature anorthic α-phase and a monoclinic high temperature β-phase with an incommensurately modulated structure. The structures of both polymorphs were solved using transmission electron microscopy and refined from synchrotron powder X-ray diffraction data. The (23) o , q = 1/2a* + 1/2c*). In both cases the modulation arises due to Eu/K cation ordering at the A site: the formation of a 2-dimensional Eu 3+ network is characteristic for the α-phase, while a 3-dimensional Eu 3+-framework is observed for the β-phase structure. The luminescent properties of KEu(MoO 4 ) 2 samples prepared under different annealing conditions were measured, and the relation between their optical properties and their structures is discussed.

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KGd(MoO4)2:Eu3+ as a promising red phosphor for light-emitting diode application

Cited by 28 publications

References 16 publications

Effect of cation vacancies on the crystal structure and luminescent properties of Ca 0.85−1.5x Gd x Eu 0.1 □ 0.05+0.5x WO 4 (0 ≤ x ≤ 0.567) scheelite-based red phosphors

Effect of cation vacancies on the crystal structure and luminescent properties of Ca 0.85−1.5x Gd x Eu 0.1 □ 0.05+0.5x WO 4 (0 ≤ x ≤ 0.567) scheelite-based red phosphors

Rapid Production of Ln₂O₂S:Eu³⁺/Tb³⁺ (Ln = Sm, La, Gd, and Y) Phosphors by Molten Salt Electrolysis

KEu(MoO₄)₂: Polymorphism, Structures, and Luminescent Properties

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KGd(MoO4)2:Eu3+ as a promising red phosphor for light-emitting diode application

Cited by 28 publications

References 16 publications

Effect of cation vacancies on the crystal structure and luminescent properties of Ca 0.85−1.5x Gd x Eu 0.1 □ 0.05+0.5x WO 4 (0 ≤ x ≤ 0.567) scheelite-based red phosphors

Effect of cation vacancies on the crystal structure and luminescent properties of Ca 0.85−1.5x Gd x Eu 0.1 □ 0.05+0.5x WO 4 (0 ≤ x ≤ 0.567) scheelite-based red phosphors

Rapid Production of Ln2O2S:Eu3+/Tb3+ (Ln = Sm, La, Gd, and Y) Phosphors by Molten Salt Electrolysis

KEu(MoO4)2: Polymorphism, Structures, and Luminescent Properties

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Product

Resources

About

Rapid Production of Ln₂O₂S:Eu³⁺/Tb³⁺ (Ln = Sm, La, Gd, and Y) Phosphors by Molten Salt Electrolysis

KEu(MoO₄)₂: Polymorphism, Structures, and Luminescent Properties