NaGdF<sub>4</sub>:Eu<sup>3+</sup> nanocrystalline: an in-depth study of energy transfer processes and Judd–Ofelt analysis using the luminescence excitation spectrum

Van Do, Phan; Ca, Nguyen Xuan; Thanh, Luong Duy; Quan, Dang Dinh; Hung, Nguyen Manh; Tien Du, Pham; Thi Huong, Nguyen; Anh, Doan Tuan

doi:10.1039/d3cp02458j

Cited by 5 publications

(3 citation statements)

References 47 publications

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“…In cubic phase, no splitting in the 5 D 0 → 7 F 1 band is observed, whereas in hexagonal, it splits into two. The band splits into multiple components when the structure is highly unsymmetric, as is our case (monoclinic) . The second-order parameter ( B 20 ) in crystal field expansion plays an important role in the mixing of wave functions and relates to the intensity of the 5 D 0 → 7 F 0 and 5 D 0 → 7 F 2 transitions by the following formula: , I false( 5 normalD 0 → 5 normalF 0 false) I false( 5 normalD 0 → 5 normalF 2 false) = 4 B 20 2 75 Δ 20 2 where Δ 20 (cm –1 ) is the energy gap from the 7 F 0 level to the 7 F 2 .…”

Section: Resultsmentioning

confidence: 98%

“…The band splits into multiple components when the structure is highly unsymmetric, as is our case (monoclinic) . The second-order parameter ( B 20 ) in crystal field expansion plays an important role in the mixing of wave functions and relates to the intensity of the 5 D 0 → 7 F 0 and 5 D 0 → 7 F 2 transitions by the following formula: , I false( 5 normalD 0 → 5 normalF 0 false) I false( 5 normalD 0 → 5 normalF 2 false) = 4 B 20 2 75 Δ 20 2 where Δ 20 (cm –1 ) is the energy gap from the 7 F 0 level to the 7 F 2 . For K 3 GdF 6 :5% Eu 3+ , the B 20 parameter is determined to be 691, 916, 900, and 707 cm –1 for K 3 GdF 6 :5% Eu 3+ (as prepared), K 3 GdF 6 :5% Eu 3+ (annealed at 300 °C), K 3 GdF 6 :5% Eu 3+ (annealed at 400 °C), and K 3 GdF 6 :5% Eu 3+ (annealed at 500 °C).…”

Section: Resultsmentioning

confidence: 98%

“…The band splits into multiple components when the structure is highly unsymmetric, as is our case (monoclinic). 46 The second-order parameter (B 20 ) in crystal field expansion plays an important role in the mixing of wave functions and relates to the intensity of the 5 D 0 → 7 F 0 and 5 D 0 → 7 F 2 transitions by the following formula: 46,47…”

Section: Excitation and Emission Spectral Studies Of K 3 Gdf 6 :Eu 3+mentioning

confidence: 99%

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Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Singh Deo,

Gupta,

Vijaya Prakash

2024

ACS Appl. Opt. Mater.

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Herein, we report a strategy to synthesize an Eu 3+ doped singlephase monoclinic K 3 GdF 6 double perovskite via a solid-state route with an average crystallite size of 18 ± 2.00 nm. Characterization methods such as X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and spectroscopic techniques provided a thorough understanding of the material's atomic and molecular-level structural, morphological, and functional properties. The photoluminescence study of K 3 GdF 6 :5% Eu 3+ under different excitations such as 273, 393, 405, and 464 nm showed a hypersensitive, intense red emission at 613 nm and orange emission at 590 nm, which is a necessary parameter for high contrast imaging, particularly for overcoming autofluorescent background. The usage of K 3 GdF 6 :5% Eu 3+ for spectral mapping and imaging has been specifically demonstrated through spatial photoluminescence mapping under 405 nm laser excitation. Moreover, the optical studies substantiated the occurrence of quantum cutting in K 3 GdF 6 :Eu 3+ through systematic energy transfer between Gd 3+ and Eu 3+ . Interestingly, in addition to optical attributes, the double perovskite showed superparamagnetic behavior at low temperature (2 K) with an average saturation magnetization of 96.86 emu/g. Through an exhaustive investigation of its optical and superparamagnetic properties, the synthesized double perovskite has been demonstrated to be a feasible choice for bioimaging (including optical and MRI), multiplexing detection, sensing, and other optical technologies.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

Section: Excitation and Emission Spectral Studies Of K 3 Gdf 6 :Eu 3+mentioning

confidence: 99%

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Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Singh Deo,

Gupta,

Vijaya Prakash

2024

ACS Appl. Opt. Mater.

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Site Substitution Toward Modified Spectral Behaviors in Ce³⁺‐Activated Sr₄La₆(SiO₄)₆Cl₂ Cyan‐Emitting Phosphors for Plant Growth and Full‐Spectrum White Light‐Emitting Diode

Guo,

Wang,

et al. 2024

Laser & Photonics Reviews

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Series of Ce3+‐activated Sr4La6(SiO4)6Cl2 (SLSOC) cyan‐emitting phosphors are designed to satisfy the demands of plant growth and full‐spectrum white‐light diode (white‐LED). Herein, to modify the luminescence behaviors of phosphors, Ce3+ is designed to occupy the different sites in SLSOC host lattices. Excited at 353 nm, the resultant phosphors emit glaring cyan emission originating from Ce3+ with an asymmetric emission band, which is assigned to the two‐site occupation of Ce3+ at Sr2+ or La3+ crystallographic sites. Moreover, the quantum efficiency and thermal quenching performances of synthesized phosphors are also analyzed, which are all dependent on the crystallographic sites taken by Ce3+. Via using the designed phosphors, two cyan‐emitting LEDs are packaged and their emissions are highly overlapped with the absorption spectra of plant pigments, which allow their feasibilities in plant growth. Furthermore, the artificial plant growth experiments are performed to clarify the significant positive influence of the packaged cyan‐emitting LEDs on plant growth. Additionally, via using the prepared cyan‐emitting phosphors to compensate the cyan gap, the full‐spectrum white‐LEDs with high electroluminescence performances are designed. These achievements reveal that the Ce3+‐activated SLSOC phosphors with controllable luminescence properties are promising cyan‐emitting converters for artificial plant growth LED and full‐spectrum white‐LED.

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Judd‐Ofelt analysis and optical properties of Eu³⁺‐doped GdPO₄ phosphors synthesized by combustion method

Hien,

Roan,

Minh

et al. 2024

Vietnam Journal of Chemistry

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The Eu3+‐doped GdPO4 nanoparticles were prepared via a straightforward combustion method using urea as fuel and nitrates as a precursor. X‐ray powder diffraction patterns, infrared spectrum (IR), HR‐TEM, photoluminescence (PL), phonon sideband and photoluminescence excitation (PLE) were researched. There is a phase transition from the hexagonal phase into the monoclinic phase when the calcined temperature is over 700 °C. All of phosphors have similar morphology and the average diameters for nanoparticles are 20–30 nm. Under the excitation at 273 nm, GdPO4:Eu3+ powders showed red emission bands originating from the 5D0–7FJ (J = 1, 2, 3 and 4) transitions of Eu3+. The orange‐red emission (5D0–7F1 transition) is dominated because the Eu3+ ions exist with inversion symmetry in the lattice. The study suggests that the optimal Eu3+ ions concentration is 5 mol%. In addition, the second order crystal field parameter (B20) and the influence of concentration of Eu3+ ions on decay time are also mentioned, the intensity parameters (Ω2,4,6) and quantum efficiency were determined based on Judd‐Ofelt theory.

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NaGdF₄:Eu³⁺ nanocrystalline: an in-depth study of energy transfer processes and Judd–Ofelt analysis using the luminescence excitation spectrum

Abstract: NaGdF4 nanocrystalline doped with different concentrations of Eu3+ ion have been synthesized by the precipitation method. The structure and morphology of the material were investigated through the measurements of the...

Cited by 5 publications

References 47 publications

Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Site Substitution Toward Modified Spectral Behaviors in Ce³⁺‐Activated Sr₄La₆(SiO₄)₆Cl₂ Cyan‐Emitting Phosphors for Plant Growth and Full‐Spectrum White Light‐Emitting Diode

Judd‐Ofelt analysis and optical properties of Eu³⁺‐doped GdPO₄ phosphors synthesized by combustion method

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NaGdF4:Eu3+ nanocrystalline: an in-depth study of energy transfer processes and Judd–Ofelt analysis using the luminescence excitation spectrum

Abstract: NaGdF4 nanocrystalline doped with different concentrations of Eu3+ ion have been synthesized by the precipitation method. The structure and morphology of the material were investigated through the measurements of the...

Cited by 5 publications

References 47 publications

Light Emitting Rare Earth Doped K3GdF6:Eu3+ for Spectral Mapping/Imaging Studies

Light Emitting Rare Earth Doped K3GdF6:Eu3+ for Spectral Mapping/Imaging Studies

Site Substitution Toward Modified Spectral Behaviors in Ce3+‐Activated Sr4La6(SiO4)6Cl2 Cyan‐Emitting Phosphors for Plant Growth and Full‐Spectrum White Light‐Emitting Diode

Judd‐Ofelt analysis and optical properties of Eu3+‐doped GdPO4 phosphors synthesized by combustion method

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NaGdF₄:Eu³⁺ nanocrystalline: an in-depth study of energy transfer processes and Judd–Ofelt analysis using the luminescence excitation spectrum

Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Site Substitution Toward Modified Spectral Behaviors in Ce³⁺‐Activated Sr₄La₆(SiO₄)₆Cl₂ Cyan‐Emitting Phosphors for Plant Growth and Full‐Spectrum White Light‐Emitting Diode

Judd‐Ofelt analysis and optical properties of Eu³⁺‐doped GdPO₄ phosphors synthesized by combustion method