Fabrication of single-phase BaLaAlO<sub>4</sub>:Dy<sup>3+</sup> nanophosphors by combustion synthesis

Sehrawat, Priyanka; Khatkar, Avni; Boora, Priti; Kumar, Mukesh; Singh, S. K.; Malik, R.K.; Khatkar, S.P.; Taxak, V.B.

doi:10.1080/10426914.2020.1762206

Cited by 54 publications

(9 citation statements)

References 30 publications

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“…CIE chromaticity diagram is used to determine the emission color of phosphors. CIE chromaticity coordinates of Ca9DyxAl(1-x)(PO4)7 (x = 0.01 -0.15 mol) were calculated using MATLAB software as shown in table 4 which are found to be identical with National television System Committee (NTSC) coordinates for white color emission [35]. Fig.…”

Section: Cie Chromaticity Coordinatesmentioning

confidence: 99%

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Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

Dahiya

Kumar

2021

J Mater Sci: Mater Electron

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A series of novel single-phase white light-emitting Dy 3+ doped Ca9Al(PO4)7 nanophosphors was successfully synthesized at 1100 ˚C via solution combustion route. X-ray diffraction (XRD) and Rietveld refinement analysis of Ca9Dy0.03Al0.97(PO4)7 sample confirmed that this phosphor had a trigonal crystal structure with space group R3c(161). Meanwhile, as-observed from the transmission electron microscopy (TEM) study; particles of Ca9DyxAl(1-x)(PO4)7 samples were found to have a quadrilateral shape with crystallite sizes around 40-60 nm which were also confirmed by the Debye Scherrer equation. Under near-ultraviolet (NUV) excitation at 350 nm, photoluminescence (PL) emission spectra of nanocrystalline Ca9Al(PO4)7: Dy 3+ phosphors showed two peaks at 481 nm and 572 nm corresponding to 4 F9/2→ 6 H15/2 and 4 F9/2→ 6 H13/2 transitions, respectively. The optimum concentration was found to be x = 0.03 mol. The critical energy transfer distance was calculated to be 20 and further Huang analysis concluded the exact mechanism i.e. dipole-dipole interactions responsible for concentration quenching in Ca9DyxAl(1-x)(PO4)7 samples. Furthermore, the Commission Internationale de I'Eclairage (CIE) chromaticity coordinates of Ca9Dy0.03Al0.97(PO4)7 nanophosphor was calculated to be (0.260, 0.297) and this nanophosphor had correlated color temperature (CCT) of 11332 K which is located in a cool white area. Existing results indicate that Ca9Dy0.03Al0.97(PO4)7 nanophosphor may be considered as a favorable candidate in NUV based single-phase cool White light-emitting diodes (WLEDs).

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Section: Cie Chromaticity Coordinatesmentioning

confidence: 99%

“…Furthermore, the average crystallite size (D) of Ca9DyxAl(1-x)(PO4)7 (x = 0.01 -0.15 mol) samples is determined by a well known the Debye-Scherer's equation [34,35]:…”

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confidence: 99%

Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

Dahiya

Kumar

2021

J Mater Sci: Mater Electron

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“…An excessive concentration in the crystal lattice could reduce the distance between two Dy 3+ ions and promote cross-relaxation and resonance energy transfer [ 14 , 15 ]. Consequently, the emission intensity is weakened due to concentration quenching [ 16 , 17 , 18 ]. Therefore, it is essential to investigate an asymmetric fluorescent material with a relatively fixed intensity ratio for intense emission [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Fixed Yellow-to-Blue Intensity Ratio of Dy3+ in KY(CO3)2 Host for Emission Color Tuning

Huang,

Qian,

Sun

et al. 2024

Materials

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Dy3+, Ce3+ co-doped KY(CO3)2 phosphors with a monoclinic structure were synthesized using the hydrothermal method to create a fixed yellow-to-blue ratio emission. The [YO8] polyhedron, consisting of a Y atom and eight oxygen atoms, forms a relatively independent microstructure within the KY(CO3)2 host. Y3+ ions are partially replaced by Ce3+ or Dy3+ ions to construct the [CeO8] or [DyO8] polyhedral fluorescence emission unit. The spectral measurements indicate that Ce3+ and Dy3+ can maintain relatively independent fluorescence emission characteristics in the KY(CO3)2 host. The yellow-to-blue intensity ratio of Dy3+ remains close to 1 and does not change with the variation in the doping concentration of KY(CO3)2:Dy3+ and KY(CO3)2:Dy3+,Ce3+ phosphors. When Ce3+ and Dy3+ are co-doped with KY(CO3)2, the emission intensities of Dy3+ under 339 nm and 365 nm excitation increase by 8.43 and 2.32 times, respectively, through resonance energy transfer and cross-relaxation. All Ce3+-doped KY(CO3)2:Dy3+ phosphors can emit white light. Among them, the emitted light of KY(CO3)2:3%Dy3+,5%Ce3+ is closest to standard daylight. Therefore, a stable [YO8] polyhedral structure can be used to achieve more color tuning of light.

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“…16 The Dy 3+ activated host materials exhibit two strong emission bands in the blue color region around 482 nm due to the 4 F 9/2 -6 H 15/2 transition, and the yellow color region around 572 nm due to the 4 F 9/2 -6 H 13/2 transition. [17][18][19] According to the literature, some Dy 3+ activated materials show weak red emission around 670 nm due to the 4 F 9/2 -6 H 13/2 transition. 20 Due to the absence or a weak red color emission, Dy 3+ activated materials show a very poor color rendering index.…”

Section: Introductionmentioning

confidence: 99%

Color-tunable luminescence, energy transfer behavior and I–V characteristics of Dy³⁺,Eu³⁺ co-doped La(PO₄) phosphors for WLEDs and solar applications

Parauha

Dhoble

2022

New J. Chem.

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Fabrication of single-phase BaLaAlO₄:Dy³⁺ nanophosphors by combustion synthesis

Cited by 54 publications

References 30 publications

Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

Fixed Yellow-to-Blue Intensity Ratio of Dy3+ in KY(CO3)2 Host for Emission Color Tuning

Color-tunable luminescence, energy transfer behavior and I–V characteristics of Dy³⁺,Eu³⁺ co-doped La(PO₄) phosphors for WLEDs and solar applications

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Fabrication of single-phase BaLaAlO4:Dy3+ nanophosphors by combustion synthesis

Cited by 54 publications

References 30 publications

Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

Fixed Yellow-to-Blue Intensity Ratio of Dy3+ in KY(CO3)2 Host for Emission Color Tuning

Color-tunable luminescence, energy transfer behavior and I–V characteristics of Dy3+,Eu3+ co-doped La(PO4) phosphors for WLEDs and solar applications

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Fabrication of single-phase BaLaAlO₄:Dy³⁺ nanophosphors by combustion synthesis

Color-tunable luminescence, energy transfer behavior and I–V characteristics of Dy³⁺,Eu³⁺ co-doped La(PO₄) phosphors for WLEDs and solar applications