Ordered langasites La3Ga5MO14:Eu3+ (M = Zr, Hf, Sn) as red-emitting LED phosphors

Reinhardt, Annemarie; Zych, Aleksander; Köhler, I.; Albert, Barbara

doi:10.1016/j.jlumin.2019.116833

Cited by 15 publications

(4 citation statements)

References 27 publications

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“…For the trivalent REE, charge balancing paired substitutions (or defects) would be required. Paqueite is not structurally related to other minerals (i.e., it would be the founding and only member of a paqueite group), but there are hundreds of known synthetic P 321 germanates and langasites that are isotypic with paqueite (e.g., Kaminskii et al., 1984; Mill′ et al., 1983; Reinhardt et al., 2018). These materials are important potential laser and light emitting diode phosphors and find use as acoustic wave filters and electro‐optic Q‐switches.…”

Section: Resultsmentioning

confidence: 99%

New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca₃TiSi₂(Al,Ti,Si)₃O₁₄, and burnettite, CaVAlSiO₆

Beckett

Tissot

et al. 2022

Meteorit & Planetary Scien

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Paqueite (Ca 3 TiSi 2 [Al,Ti,Si] 3 O 14 ; IMA 2013-053) and burnettite (CaVAlSiO 6 ; IMA 2013-054) are new refractory minerals, occurring as euhedral to subhedral crystals within aluminous melilite in A-WP1, a type A Ca-Al-rich inclusion, and CGft-12, a compact type A (CTA) from the Allende CV3 carbonaceous chondrite. Type paqueite from A-WP1 has an empirical formula of (Ca 2.91 Na 0.11 )Ti 4+ Si 2 (Al 1.64 Ti 4+ 0.90 Si 0.24 V 3+ 0.12 Sc 0.07 Mg 0.03 )O 14 , with a trigonal structure in space group P321 and cell parameters a = 7.943 Å, c = 4.930 Å, V = 269.37 Å3 , and Z = 1. Paqueite's general formula is Ca 3 TiSi 2 (Al,Ti,Si) 3 O 14 and the endmember formula is Ca 3 TiSi 2 (Al 2 Ti)O 14 . Type burnettite from CGft-12 has an empirical formula of Ca 1.01 (V 3+ 0.56 Al 0.25 Mg 0.18 )(Si 1.19 Al 0.81 )O 6 . It assumes a diopside-type C2/c structure with a = 9.80 Å, b = 8.85 Å, c = 5.36 Å, β = 105.6°, V = 447.7 Å3 , and Z = 4. Burnettite's general formula is Ca(V,Al,Mg)AlSiO 6 and the endmember formula is CaVAlSiO 6 . Paqueite and burnettite likely originated as condensates, but the observed grains may have crystallized from local V-rich melts produced during a later thermal event. For CGft-12, the compositions of paqueite, clinopyroxene, and perovskite suggest that type As drew from two distinct populations of grains. Hibonite grains drew from multiple populations, but these were well mixed and not equilibrated prior to incorporation into type A host melilite.

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Section: Resultsmentioning

confidence: 99%

New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca₃TiSi₂(Al,Ti,Si)₃O₁₄, and burnettite, CaVAlSiO₆

Beckett

Tissot

et al. 2022

Meteorit & Planetary Scien

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“…Eu 3+ , a commonly used activator for red phosphors, has received considerable attention due to its characteristic of emitting narrowband red light around 610 nm under an excitation of ultraviolet or n-UV light. [12][13][14][15][16] However, because the emission of Eu 3+ originates from f-f forbidden transition in the inner layer, low external quantum efficiency has always been a key problem hindering the commercial application of Eu 3+ -activated red phosphors. To improve the luminous efficiency of Eu 3+ , researchers have proposed to achieve a higher concentration of Eu 3+ doping into the host of layered crystal structure through the zero-concentration quenching.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strong f–f excitation in hafnium germanate: Near‐UV LED and cathode beam–pumped red phosphor with thermal robustness

Zhou

2023

Int J Applied Ceramic Tech

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Developing narrowband red phosphors has always been a frontier topic in the phosphor community. In this study, a novel hafnium germanate red phosphor, BaHfGe 3 O 9 :Eu 3+ , was successfully synthesized by solid-state reaction method. The phase and crystal structure of BaHfGe 3 O 9 were investigated by the Rietveld refinement of powder X-ray powder diffraction. The band structure was analyzed by density functional theory calculations. Most importantly, the luminescence behavior of phosphors under near-ultraviolet (n-UV) light and cathode rays sources was studied in detail to explore the possibility of their applications in white light-emitting diodes and field emission display. The BaHfGe 3 O 9 :Eu 3+ phosphor exhibits strong f-f excitation and excellent thermal robustness due to Eu 3+ localization in the rigid lattice and asymmetric Ba 2+ sites. Under cathode rays and n-UV light excitation, BaHfGe 3 O 9 :Eu 3+ exhibits narrowband red light emission peaked at 610 nm. Moreover, BaHfGe 3 O 9 :Eu 3+ shows excellent saturation resistance and aging resistance. The performance of the LED lamp encapsulated by the BaHfGe 3 O 9 :Eu 3+ phosphor was studied. The results show that BaHfGe 3 O 9 :Eu 3+ is a potential red phosphor for multifunctional applications.

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“…as high-efficiency red-emitting phosphors due to the electric dipole of the 5 D 0 → 7 F 2 position for various optical applications, such as Ba 2 Y 5 B 5 O 17 :Bi 3+ /Eu 3+ , CaCO 3 :Eu 3+ , AlPO 4 :Eu 3+ , Ca 5 (PO 4 ) 2 SiO 4 :Eu 3+ , and Sr 3 ZnTa 2 O 9 :Eu 3+ . − Particularly, Eu 3+ -activated luminescent materials have been promising for white-light-emitting diodes (WLEDs) as a red-emitting phosphor based on red–green–blue (RGB) theory, which could achieve high color rendering index (CRI > 80) and low correlated color temperature (CCT < 7000 K). It not only overcomes the shortcomings of the conventional method of a yellow-emitting phosphor (Y 3 Al 5 O 12 :Ce 3+ ) covered on a blue chip but also maintains the superior performances of long service time, energy-saving, high luminous efficiency, good color purity, and so on. − Briefly, there is still a certain value in investigating Eu 3+ -activated luminescent materials and their potential applications in the future.…”

Section: Introductionmentioning

confidence: 99%

Advantageous Occupation of Europium(III) in the B Site of Double-Perovskite Ca₂BB′O₆ (B = Y, Gd, La; B′ = Sb, Nb) Frameworks for White-Light-Emitting Diodes

Hua

2021

ACS Sustainable Chem. Eng.

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At present, rare-earth-activated perovskite-type materials have attracted lots of interest from researchers owing to their excellent advantages of unique electron properties and stable structure. This present work was designed to synthesize, investigate, and compare the photoluminescence properties in europium(III) (Eu 3+ )-activated Ca 2 BB′O 6 (B = Y, Gd, and La; B′ = Sb and Nb) double-perovskite (A 2 BB′O 6 ) luminescent materials. The doped Eu 3+ ions substitute the B sites of Y 3+ , Gd 3+ , and La 3+ ions, which are distributed to the equilibrium valence state and exhibit little difference in ion radius among them. All the resultant samples have a monoclinic structure, and the B sites strongly affect the space group in double-perovskite Ca 2 BB′O 6 frameworks. Additionally, the emission intensity, thermal stability, decay curve, color purity, quantum yield (QY), etc. were determined. The Ca 2 BNbO 6 :Eu 3+ (B = Y, Gd, and La) frameworks have good QYs (>42%), which are promising for white-light-emitting diodes (WLEDs). Besides, the red-emitting Ca 2 BB′O 6 :Eu 3+ − polydimethylsiloxane (PDMS) and white-emitting CYN0.1Eu 3+ −commercial phosphors (CP)−PDMS films were fabricated. Eventually, the packaged WLEDs based on the Ca 2 BNbO 6 :Eu 3+ (B = Y, Gd, and La) powders and a novel white-emitting structure based on the CYN:0.1Eu 3+ −CP−PDMS film were confirmed to have suitable color rendering index and correlated color temperature values for indoor illumination.

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Ordered langasites La3Ga5MO14:Eu3+ (M = Zr, Hf, Sn) as red-emitting LED phosphors

Cited by 15 publications

References 27 publications

New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca₃TiSi₂(Al,Ti,Si)₃O₁₄, and burnettite, CaVAlSiO₆

New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca₃TiSi₂(Al,Ti,Si)₃O₁₄, and burnettite, CaVAlSiO₆

Strong f–f excitation in hafnium germanate: Near‐UV LED and cathode beam–pumped red phosphor with thermal robustness

Advantageous Occupation of Europium(III) in the B Site of Double-Perovskite Ca₂BB′O₆ (B = Y, Gd, La; B′ = Sb, Nb) Frameworks for White-Light-Emitting Diodes

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Ordered langasites La3Ga5MO14:Eu3+ (M = Zr, Hf, Sn) as red-emitting LED phosphors

Cited by 15 publications

References 27 publications

New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca3TiSi2(Al,Ti,Si)3O14, and burnettite, CaVAlSiO6

New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca3TiSi2(Al,Ti,Si)3O14, and burnettite, CaVAlSiO6

Strong f–f excitation in hafnium germanate: Near‐UV LED and cathode beam–pumped red phosphor with thermal robustness

Advantageous Occupation of Europium(III) in the B Site of Double-Perovskite Ca2BB′O6 (B = Y, Gd, La; B′ = Sb, Nb) Frameworks for White-Light-Emitting Diodes

Contact Info

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New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca₃TiSi₂(Al,Ti,Si)₃O₁₄, and burnettite, CaVAlSiO₆

New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca₃TiSi₂(Al,Ti,Si)₃O₁₄, and burnettite, CaVAlSiO₆

Advantageous Occupation of Europium(III) in the B Site of Double-Perovskite Ca₂BB′O₆ (B = Y, Gd, La; B′ = Sb, Nb) Frameworks for White-Light-Emitting Diodes