Effect of alkali metal ions on the spectra of CaZn2(PO4)2: Sm3+ phosphor analyzed by J-O theory

Qiu, Ning; Quan, Bo; Shi, Yuhua

doi:10.1016/j.jlumin.2018.10.101

Cited by 61 publications

(4 citation statements)

References 42 publications

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“…Table 3 gives a comparison of the bandgap values with other reported works. Furthermore, the refractive index can be calculated from the optical bandgap energy using the Dimitrov–Sakka relation, 33

\begin{equation}\frac{{{n^2} - 1}}{{{n^2} + 1}} = 1 - \sqrt {\frac{{{E_{\rm{g}}}}}{{20}}} \end{equation}

…”

Section: Resultsmentioning

confidence: 99%

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu³⁺‐doped Ca₂LiMg₂V₃O₁₂ phosphors

Princy,

Annie Rathnakumari,

Masilla Moses Kennedy

2023

J Am Ceram Soc.

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A novel vanadate host Ca 2 LiMg 2 V 3 O 12 (CLMV) and the Eu 3+ -doped samples were synthesized via a solid-state reaction method. The phase formation and the morphological analysis were studied in detail. The Rietveld refinement result shows that the host belongs to cubic space group Ia-3d (230) with lattice parameter, a = 12.3948 Å, V = 1904.23 Å 3 , and Z = 8. The diffuse reflectance spectroscopy measurement estimated the bandgap of the host and the CLMV:0.05Eu 3+ phosphors. The host exhibits a broad absorption band (peak at 345 nm) ranging from 240 to 380 nm, which is attributed to the charge transfer in the O 2− -V 5+ complex. Under near UV excitation (λ exc = 345 nm), the host gives a broad emission band covering the visible region from 400 to 730 nm and the emission is in the bluish-green region of the CIE diagram. When the host is doped with the Eu 3+ ions and excited at 345 nm, the emission spectrum depicts the superimposition of the characteristic emission bands (red emission) of the Eu 3+ ions corresponding to the f-f transitions over the broad emission band of the host. The calculated color coordinates (9600 to 2280 K) demonstrated the color tuning ability of the phosphor as the dopant concentration is increased in the host. This is because the VO 4 3− group plays the sensitiser role and partially transfers energy with the Eu 3+ ions. When the same set of phosphors were excited at the dominant characteristic excitation band (λ exc = 394 nm) of the Eu 3+ , the characteristic emission bands of the Eu 3+ in the orange-red region were observed. As the electric dipole transition of the Eu 3+ was found to be dominant, the prepared phosphors possessed high color purity (CP). The energy transfer mechanism and the lifetime values were also presented. The temperature-dependent PL studies showed good thermal stability of the optimum sample. Various radiative transition properties were analyzed by the Judd-Ofelt theory. The photometric results reveal the color tuning ability and CP of the CLMV:xEu 3+ phosphors.

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\begin{equation}\frac{{{n^2} - 1}}{{{n^2} + 1}} = 1 - \sqrt {\frac{{{E_{\rm{g}}}}}{{20}}} \end{equation}

…”

Section: Resultsmentioning

confidence: 99%

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu³⁺‐doped Ca₂LiMg₂V₃O₁₂ phosphors

Princy,

Annie Rathnakumari,

Masilla Moses Kennedy

2023

J Am Ceram Soc.

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“…By Tauc plot method, the optical band gap energy of LMO:Eu 3+ , Bi 3+ phosphor is obtained. The relationship between the refractive index and the optical band gap energy is given by the Dimitrov and Sakka relation 35 .

\frac{n^{2} ‐ 1}{n^{2} + 2} = 1 ‐ \sqrt{\frac{E_{italicopt}}{20}}

…”

Section: Resultsmentioning

confidence: 99%

“…This result is consistent with the red‐shift of the absorption spectrum. According to J‐O theory, the theoretical oscillator strength (

f_{cal}

) of the transition from the ground state (

ψ J

) to an excited state (

ψ^{'} J^{'}

) is expressed by the follow formula 35 :

f_{italiccal} = f_{italicED} + f_{italicMD} = \frac{8 π^{2} m c v}{3 h e^{2} (2 J + 1)} (\frac{{(n^{2} + 2)}^{2}}{9 n} S_{italicED} + n S_{italicMD})

where

f_{ED}

is the oscillator strength of electric dipole,

f_{MD}

is the oscillator strength of magnetic dipole,

h

is the Planck's constant, J is the total angular momentum of the ground state, and n represents the refractive index.

S_{MD}

is the magnetic dipole line strength, which frees from the change of crystal field energy (

S_{italicMD} = 7.83 \times 10^{‐ 42}

).…”

Section: Resultsmentioning

confidence: 99%

Enhanced luminescence properties of Eu³⁺ in La₂MoO₆ by nonsensitization of Bi³⁺

et al. 2020

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It was unusual for Bi3+ ions to enhance the emission intensity of phosphors via nonsensitization. Here, La2MoO6:Eu3+, Bi3+ phosphors were successfully synthesized by a high temperature solid‐state reaction method in air atmosphere. As the increase of doping concentration of Bi3+, the emission spectra of La2MoO6:Eu3+, Bi3+ phosphors had obvious shifts, splits and the enhancement of intensities, which indicated that the characteristics of the phosphors were modified. To analyze these phenomena, the crystal structure refinements, spectral characteristic analyze and Judd‐Ofelt theoretical calculation were mainly performed. Bi3+ ions played the role of the nonsensitizer and affected the distortion of the crystal, the sites of Eu3+ ions, the field splitting energy and the internal quantum yield. Moreover the nephelauxetic effects of Bi3+ ions and the ET process caused synergistically the life times of La2MoO6:Eu3+, Bi3+ phosphors to increase and then gradually decrease. The CIE coordinates of phosphors changed within a small range. This study might be instrumental in promoting the further application of Bi3+ ions in rare earth luminescent materials.

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“…Moustafa and colleagues [ 13 ] studied the spectral properties of Er 3+ ions in antimony phosphate glass combined with Ag nanoparticles. QingjuNing and colleagues [ 14 ] reported the effects of alkali metal ions on CaZn 2 (PO 4 ) 2 :Sm 3+ . However, to the best of our knowledge, the optical properties of ZGO:Eu 3+ have not been comprehensively evaluated yet using J–O theory.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the structure and luminescence properties of Zn₂GeO₄:Eu³⁺ according to Judd–Ofelt theory

et al. 2022

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The preparation and characteristic of nanorod‐like Zn2GeO4 doped with Eu3+ or zinc germanate (ZGO):xEu3+ (x = 0 ÷ 0.05), which was synthesized using the hydrothermal method, are described. The influence of Eu3+‐doping ions on the structure and the optical properties of ZGO was also investigated. According to the photoluminescence spectra, ZGO:xEu3+ nanophosphors gave a red emission due to the 5D0→7F2 emission of Eu3+ ions. In accordance with Judd–Ofelt theory, the intensity parameters for f–f transitions from the emission and absorption spectrum were determined. At the 5D0 excited state of Eu3+, total spontaneous emission probabilities (AR), lifetimes (τR), branching ratios (βR), and quantum efficiency (η) were calculated. The ZGO:xEu3+ (x = 0.02, 0.03, 0.04) phosphor showed the branch ratio β (5D0→7F2) > 60%, indicating that the phosphors prepared here have a promising potential as laser light. The sample with a concentration of 0.04Eu3+ achieved the highest quantum efficiency of 84%, suggesting that it has potential light‐emitting diode applications.

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Effect of alkali metal ions on the spectra of CaZn2(PO4)2: Sm3+ phosphor analyzed by J-O theory

Cited by 61 publications

References 42 publications

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu³⁺‐doped Ca₂LiMg₂V₃O₁₂ phosphors

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu³⁺‐doped Ca₂LiMg₂V₃O₁₂ phosphors

Enhanced luminescence properties of Eu³⁺ in La₂MoO₆ by nonsensitization of Bi³⁺

Analysis of the structure and luminescence properties of Zn₂GeO₄:Eu³⁺ according to Judd–Ofelt theory

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Effect of alkali metal ions on the spectra of CaZn2(PO4)2: Sm3+ phosphor analyzed by J-O theory

Cited by 61 publications

References 42 publications

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu3+‐doped Ca2LiMg2V3O12 phosphors

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu3+‐doped Ca2LiMg2V3O12 phosphors

Enhanced luminescence properties of Eu3+ in La2MoO6 by nonsensitization of Bi3+

Analysis of the structure and luminescence properties of Zn2GeO4:Eu3+ according to Judd–Ofelt theory

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Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu³⁺‐doped Ca₂LiMg₂V₃O₁₂ phosphors

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu³⁺‐doped Ca₂LiMg₂V₃O₁₂ phosphors

Enhanced luminescence properties of Eu³⁺ in La₂MoO₆ by nonsensitization of Bi³⁺

Analysis of the structure and luminescence properties of Zn₂GeO₄:Eu³⁺ according to Judd–Ofelt theory