CsBaB3O6:Eu3+ red-emitting phosphors for white LED and FED: Crystal structure, electronic structure and luminescent properties

Wu, Quansheng; Xie, Yujie; She, Fang; Zhao, Qian; Zhou, Jiangcong

doi:10.1016/j.jre.2020.07.014

Cited by 33 publications

(12 citation statements)

References 39 publications

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“…So far, various types of red-emitting phosphors have been reported. For example, the NaGdF 4 :Eu 3+ phosphor exhibited visible red light with admirable color purity; good thermal stability and good resistance to saturation and degradation were observed in the CsBaB 3 O 6 :Eu 3+ phosphor; and the red-emitting GdCaAl 3 O 7 :Eu 3+ phosphor has good color rendering capacity, showing potential in warm white LED applications . However, Eu 3+ -doped phosphors inevitably suffer from low color purity, poor thermal stability, and low quantum yield, restricting their general development.…”

Section: Introductionmentioning

confidence: 99%

Eu³⁺-Activated Alkali Rare-Earth Double-Tungstate Nanoparticles for Near-Ultraviolet-Light-Triggered Indoor Illumination

Tang

Jiang

Yang

et al. 2022

ACS Appl. Nano Mater.

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Phosphors for near-ultraviolet (NUV)-triggered white light-emitting diodes (LEDs) have become an attractive research topic in recent years. However, it is still difficult for phosphors to have simultaneous high luminous intensity, superior color purity, and excellent thermal stability. Hence, a series of Eu3+-activated alkali rare-earth double-tungstate nanoparticles with high luminescence intensity were prepared by a facile hydrothermal reaction method. The influence of rare-earth ions and alkali cations on the luminescence properties was investigated. Impressively, the prepared phosphors exhibit superior color purity and excellent thermal stability. Meanwhile, the emission intensity and color purity can be controlled by tuning the concentrations of Eu3+ ions. By employing the resultant nanoparticles, a fabricated LED device emitted bright warm white light with a high color rendering index (CRI) of 92.12 and a suitable correlated color temperature (CCT) of 4689 K. This work straightly confirms that the prepared phosphors are promising candidates as red-emitting components applied in NUV-triggered indoor illumination.

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Section: Introductionmentioning

confidence: 99%

Eu³⁺-Activated Alkali Rare-Earth Double-Tungstate Nanoparticles for Near-Ultraviolet-Light-Triggered Indoor Illumination

Tang

Jiang

Yang

et al. 2022

ACS Appl. Nano Mater.

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“…For the CGN:0.1Eu 3+ -WLEDs, these values were measured to be (0.365, 0.373), 85.45, and 4436 K in turn. The high CRI and low CCT values of WLED devices were relatively excellent compared to some recent reports based on the RGB theory, such as for CsBaB 3 O 6 :Eu 3+ (CRI = 80.2, CCT = 7943 K), NaBaBO 3 :Ce 3+ /Tb 3+ (CRI = 81.4, CCT = 6473 K), and Sr 4 Gd 3 Na 3 (PO 4 ) 6 F 2 :Ce 3+ /Tb 3+ (CRI = 80.8, CCT = 4617 K) phosphors. − Especially, the CCT value of the CGN:0.1Eu 3+ WLEDs was lower than 4500 K, indicating that it could emit a warm white emission with a high CRI value for indoor illumination. Besides, the third WLED device based on the CLN:0.1Eu 3+ phosphor was packaged by mixing the commercial yellow-emitting YAG:Ce 3+ phosphors on a blue chip (∼460 nm).…”

Section: Resultsmentioning

confidence: 60%

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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“…The emission spectra of Eu 3+ provide a sensitive tool to evaluate the coordination environment of the luminescent centers. − Typically, the Eu 3+ spectra are composed of multiple emissions due to the 5 D 0 → 7 F J ( J = 0–6) transitions, in which (i) the 5 D 0 - 7 F 1 transition is only partially allowed through the magnetic dipole selection rule, and its intensity is relatively independent of the site symmetry, and (ii) the 5 D 0 - 7 F 2 is a forced electric dipole transition, and its intensity is proportional to the square of the ligand dipolar polarizability. − Consequently, the ratio of R 21 , which is defined as the intensity ratio of the 5 D 0 - 7 F 2 transition relative to the 5 D 0 - 7 F 1 , is an optical indicator to show the degree of distortion from the centrosymmetric geometry for Eu 3+ . − According to Figure c,d, the 5 D 0 → 7 F 2 transition (bands at 611 and 626 nm) dominates the emission spectra in both compounds. The calculated R 21 values are 6.59 and 5.28 for Y 2 O 2 S:Eu 3+ and Y 2 O 3 :Eu 3+ , respectively.…”

Section: Resultsmentioning

confidence: 99%

Modeling Polyhedron Distortion for Mechanoluminescence in Mixed-Anion Compounds RE₂O₂S:Ln³⁺

Lin

Chen

et al. 2022

Chem. Mater.

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Mechanoluminescent (ML) materials with the characteristics of photon emission under mechanical stimulation show broad application prospects in building structural health diagnosis, biomechanical engineering, and wearable devices. However, existing ML materials cannot fully meet the requirements of different stress sensing applications due to the limited understanding of the structure and mechano-to-photon conversion mechanism of ML materials. Herein, we report novel ML materials with excellent self-recoverable ML performance in the family of mixed-anion compounds RE 2 O 2 S:Ln 3+ (RE = Y, Lu, La, Gd). The ML intensity is linearly related to the applied force, and the ML wavelength is tunable over a broad range of 514−1550 nm. More importantly, we construct a polyhedron distortion model that describes the local symmetry breaking. This model well explains the origin of ML and piezoelectricity in the compounds with centrosymmetric crystal structures. The findings may deepen the understanding of the microstructure and the mechano-to-photon conversion mechanism in ML materials and are expected to provide important guidance for the development of high-performance ML materials.

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CsBaB3O6:Eu3+ red-emitting phosphors for white LED and FED: Crystal structure, electronic structure and luminescent properties

Cited by 33 publications

References 39 publications

Eu³⁺-Activated Alkali Rare-Earth Double-Tungstate Nanoparticles for Near-Ultraviolet-Light-Triggered Indoor Illumination

Eu³⁺-Activated Alkali Rare-Earth Double-Tungstate Nanoparticles for Near-Ultraviolet-Light-Triggered Indoor Illumination

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

Modeling Polyhedron Distortion for Mechanoluminescence in Mixed-Anion Compounds RE₂O₂S:Ln³⁺

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CsBaB3O6:Eu3+ red-emitting phosphors for white LED and FED: Crystal structure, electronic structure and luminescent properties

Cited by 33 publications

References 39 publications

Eu3+-Activated Alkali Rare-Earth Double-Tungstate Nanoparticles for Near-Ultraviolet-Light-Triggered Indoor Illumination

Eu3+-Activated Alkali Rare-Earth Double-Tungstate Nanoparticles for Near-Ultraviolet-Light-Triggered Indoor Illumination

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

Modeling Polyhedron Distortion for Mechanoluminescence in Mixed-Anion Compounds RE2O2S:Ln3+

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Eu³⁺-Activated Alkali Rare-Earth Double-Tungstate Nanoparticles for Near-Ultraviolet-Light-Triggered Indoor Illumination

Eu³⁺-Activated Alkali Rare-Earth Double-Tungstate Nanoparticles for Near-Ultraviolet-Light-Triggered Indoor Illumination

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

Modeling Polyhedron Distortion for Mechanoluminescence in Mixed-Anion Compounds RE₂O₂S:Ln³⁺