Optical analysis of Dy3+/Sm3+ co-doped NaY(MoO4)2 phosphors for warm white LED

Mu, Baoqin; Huang, Jianrong; Song, Ruisi; Dong, Yunqi; Qi, Bin

doi:10.1016/j.jallcom.2023.168916

Cited by 20 publications

(7 citation statements)

References 31 publications

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“…The excited state of Dy 3+ ( 4 F 9/2 ) ions is slightly higher than those of Sm 3+ ( 4 I 19/2 ) ions, suggested that the non-radiative mechanisms are primarily responsible for the ET from Dy 3+ to Sm 3+ ions. These non-radiative ET mechanisms involve radiation reabsorption, exchange interaction, and electric multi-pole interaction [17]. The multipole-multipole interaction has a higher chance of causing ET amid all the interactions, in the present study.…”

Section: Et Calculationmentioning

confidence: 53%

“…Warm white lighting is great for areas like living rooms, bedrooms, and hallways as it creates a cozy and enjoyable lighting ambiance [8]. Studies have demonstrated that certain transitions of Dy 3+: 4 F 9/2 → 6 H 15/2 , 4 F 9/2 → 6 H 13/2 [15], Sm 3+: 4 G 5/2 → 6 H 7/2 , 4 G 5/2 → 6 H 9/2 [16], can cause Dy 3+ /Sm 3+ ions co-doped phosphors [17,18] or glasses [19,20] emission in the warm white light range. Now, selecting the appropriate host medium is also essential when preparing luminous materials for a variety of applications.…”

Section: Introductionmentioning

confidence: 99%

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Spectral studies of thermally stable Dy³⁺/Sm³⁺ co-doped Li₂Ba₅W₃O₁₅ phosphors for warm white LEDs

Anu,

Kumari,

Deopa

et al. 2024

J. Phys. D: Appl. Phys.

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In the current study, a series of Li2Ba5W3O15: RE3+ (RE=Dy, Sm) [LBW:Dy3+/Sm3+] phosphors were prepared using a high-temperature solid-state method. X-ray diffraction (XRD), Scanning electron microscopy (SEM) with Energy-dispersive X-ray analysis (EDX) scans showed that the crystal form was consistent with the standard LBW and comprised small irregularly shaped particles. Diffuse reflectance spectral (DRS) data was utilized to calculate the band gaps. Fluorescence study shows that LBW material doped with Dy3+ and Sm3+ yield distinct colors at 496 nm (blue) for Dy3+ and 582 nm (green-yellow), 612 nm (yellow), and 669 nm (red) for Sm3+ when excited by near-ultraviolet (n-UV) (336 nm) light. The observation of energy transfer (ET) between Dy3+ and Sm3+ ions play a role in modifying the luminescence of LBW:Dy3+/Sm3+ co-doped phosphors. With a constant excitation wavelength (λEx), different levels of activator doping lead to a change in the emission colors from their neutral white light to a deep orange-red region for LBW:Dy3+/Sm3+ phosphors. The decay curves demonstrate a decrease in lifetime with an increase in the concentration of activator ions (Sm3+). For D3S5 phosphor, the temperature-dependent photoluminescence (TDPL) characteristics were analysed under λEx = 336 nm excitation. The results indicate excellent luminescence thermal stability with an activation energy of 0.16 eV at λEx = 336 nm. With its low color-correlated temperature (CCT) and good thermal stability, the prepared phosphor sample shows potential as a solid-state emitting phosphor that can be used with UV chip stimulation for warm white LED applications.

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Section: Et Calculationmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Spectral studies of thermally stable Dy³⁺/Sm³⁺ co-doped Li₂Ba₅W₃O₁₅ phosphors for warm white LEDs

Anu,

Kumari,

Deopa

et al. 2024

J. Phys. D: Appl. Phys.

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“…I (Sm 3+ ) increases first and reaches maximum when x = 0.08. Then, I (Sm 3+ ) decreases on account of concentration quenching 30 . Obviously, the changing tendency of I (VO 4 3− ) and I (Sm 3+ ) is contrary.…”

Section: Resultsmentioning

confidence: 94%

“…Then, I(Sm 3+ ) decreases on account of concentration quenching. 30 Obviously, the changing tendency of I(VO 4 3− ) and I(Sm 3+ ) is contrary. It hints the existence of energy transfer (ET) from VO 43− groups to Sm 3+ ions.…”

Section: Characterization Of Luminescencementioning

confidence: 97%

Na₂GdMg₂V₃O₁₂:Sm³⁺ phosphors for three‐mode optical temperature sensing

Chen

Pang

et al. 2023

J Am Ceram Soc.

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Multi‐mode optical thermometry is emerging as a promising technique for accurate temperature measurement. Here, a series of Na2GdMg2V3O12:Sm3+ (NGMVO:xSm3+) phosphors with dual‐emission centers were successfully elaborated. Irradiated by 349 nm light, NGMVO:Sm3+ can generate emissions from VO43− and Sm3+ simultaneously due to energy transfer between them. Benefitting from difference of thermal quenching performance of two luminescent centers, fluorescence intensity (FI), fluorescence intensity ratio (FIR), and Commission Internationale de L'Eclairage coordinate modes of NGMVO:Sm3+ thermometer were designed. Maximum relative sensitivities (SR) are found to be as high as 2.21 %K−1, 2.12 %K−1, and 0.244 %K−1, respectively. Besides, with temperature increasing, SR values of FI and FIR modes decrease slowly. Their minimal SR values between 303 and 513 K maintain above 1.36 %K−1 and 1.08 %K−1, respectively. Our findings reveal that NGMVO:Sm3+ phosphors have promising applications for multimode temperature senor.

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“…Double tungstates and molybdates formulated as AB(YO 4 ) 2 (A: monovalent cation; Li + , Na + or K + , B: trivalent one; Ln 3+ , Y 3+ , or Bi 3+ , Y: Mo 6+ or W 6+ ) have been a significant research interest thanks to their structural and optical features [1,2]. These compounds crystallize in two phases belonging to the monoclinic and tetragonal structures [1].The high refractive index, nonlinear optical characteristics, luminescence properties, wide transmission range and large optical bandwidths make these compounds potential candidates in laser, light emitting diode, optical amplifier, and nonlinear optical device applications [3][4][5]. NaBi(WO 4 ) 2 and NaBi(MoO 4 ) 2 are two members of this group and the device applications of these compounds are increasing in recent years.…”

Section: Introductionmentioning

confidence: 99%

Tunable nonlinear absorption and optical limiting behavior of NaBi(Mo_xW_1−xO₄)₂ single crystals with ratio of Molybdenum/Tungsten

et al. 2023

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The compositional effect of Mo/W ratio on linear, nonlinear absorption and optical limiting behavior of the NaBi(MoxW1-xO4)2 single crystals grown by Czochralski technique was investigated. X-ray diffraction patterns of the studied crystals presented well-defined peaks associated with the tetragonal crystalline structure. The nonlinear absorption performance and optical limiting threshold were determined using an open-aperture Z-scan technique. A theoretical model including one photon absorption (OPA), two photon absorption (TPA) and free carrier absorption was used to determine the nonlinear absorption parameters. All of the results showed that defect states, which strongly affect nonlinear absorption (NA) and optical limiting behaviors, can be tuned with the Mo/W ratio, enabling NaBi(MoxW1-xO4)2 single crystals to be used in desired optoelectronic applications. Linear optical absorption analysis revealed that bandgap energy and defect states can be tuned by changing the Mo/W ratio in the crystal structure. The obtained results showed that all the studied crystals had NA behavior and the nonlinear absorption coefficient decreased with increasing Mo/W ratio. Sequential TPA is the main NA mechanism for these crystals due to the fact that the incident light energy is lower than the bandgap energies and the existence of the real intermediate state around 2.32 eV.

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Optical analysis of Dy3+/Sm3+ co-doped NaY(MoO4)2 phosphors for warm white LED

Cited by 20 publications

References 31 publications

Spectral studies of thermally stable Dy³⁺/Sm³⁺ co-doped Li₂Ba₅W₃O₁₅ phosphors for warm white LEDs

Spectral studies of thermally stable Dy³⁺/Sm³⁺ co-doped Li₂Ba₅W₃O₁₅ phosphors for warm white LEDs

Na₂GdMg₂V₃O₁₂:Sm³⁺ phosphors for three‐mode optical temperature sensing

Tunable nonlinear absorption and optical limiting behavior of NaBi(Mo_xW_1−xO₄)₂ single crystals with ratio of Molybdenum/Tungsten

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Optical analysis of Dy3+/Sm3+ co-doped NaY(MoO4)2 phosphors for warm white LED

Cited by 20 publications

References 31 publications

Spectral studies of thermally stable Dy3+/Sm3+ co-doped Li2Ba5W3O15 phosphors for warm white LEDs

Spectral studies of thermally stable Dy3+/Sm3+ co-doped Li2Ba5W3O15 phosphors for warm white LEDs

Na2GdMg2V3O12:Sm3+ phosphors for three‐mode optical temperature sensing

Tunable nonlinear absorption and optical limiting behavior of NaBi(MoxW1−xO4)2 single crystals with ratio of Molybdenum/Tungsten

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Spectral studies of thermally stable Dy³⁺/Sm³⁺ co-doped Li₂Ba₅W₃O₁₅ phosphors for warm white LEDs

Spectral studies of thermally stable Dy³⁺/Sm³⁺ co-doped Li₂Ba₅W₃O₁₅ phosphors for warm white LEDs

Na₂GdMg₂V₃O₁₂:Sm³⁺ phosphors for three‐mode optical temperature sensing

Tunable nonlinear absorption and optical limiting behavior of NaBi(Mo_xW_1−xO₄)₂ single crystals with ratio of Molybdenum/Tungsten