An effective emission of characteristic cool white light from Dy3+ doped perovskite type SrLa2Al2O7 nanophosphors in single-phase pc WLEDs

Sehrawat, Priyanka; Khatkar, Avni; Devi, Sushma; Hooda, Anju; Singh, S. K.; Malik, R.K.; Khatkar, S.P.; Taxak, V.B.

doi:10.1016/j.cplett.2019.136842

Cited by 79 publications

(13 citation statements)

References 41 publications

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“…CCT values of Ca9Al(PO4)7:Dy 3+ come out greater than 4000 K. So these are considered as cool light sources. u ' and v ' coordinates were also calculated using the following equations [49]:…”

Section: Cie Chromaticity Coordinatesmentioning

confidence: 99%

Single Phase Cool White Light Emitting Novel Ca9Al(PO4)7: Dy3+ Nanophosphor under NUV excitation

Dahiya

Kumar

2021

Preprint

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A series of novel single-phase white light-emitting Dy3+ 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: Dy3+ phosphors showed two peaks at 481 nm and 572 nm corresponding to 4F9/2→6H15/2 and 4F9/2→6H13/2 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%

Single Phase Cool White Light Emitting Novel Ca9Al(PO4)7: Dy3+ Nanophosphor under NUV excitation

Dahiya

Kumar

2021

Preprint

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“…The value of the other two intensity parameters X 2 and X 4 and their ratio for all nanophosphors (1.0-5.0 mol%) are collected in Table 6. X 2 and X 4 are related to short-range and long-range characteristics of host lattice respectively [39]. A typically high value Another CIE parameter, CCT can also be calculated using the following Mc-Camy equation [40]:…”

Section: Judd-ofelt Parameterizationmentioning

confidence: 99%

Optical, crystallographic and Judd–Ofelt analysis of europium doped Sr6Y2Al4O15 nanocrystals for NUV-WLED fabrication

Dalal

Sehrawat

Sheoran

et al. 2021

J Mater Sci: Mater Electron

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A very convenient and energy-saving route named Solution-Combustion Synthesis had been adopted to prepare a sequence of Sr 6 Y 2 Al 4 O 15 :Eu 3? (1.0-5.0 mol%) nanophosphorshaving an excellent luminescence which is very requisite in the solid-state illumination sector. The monoclinic phase and the crystallinity of the prepared samples were confirmed by Powder X-Ray Diffraction and the Rietveld refinement technique. Non-uniformity and somewhat agglomeration of particles having a size between 32 nm and 62 nm, were observed during morphological probes via Scanning and Transmission Electron Microscopies. The red-light emission was due to electronic transition from 5 D 0 ? 7 F 2 states which is purely electric-dipole allowed transition. Dexter's approach as well as Inokuti-Hirayama model,were cast-off to look into photoluminescent properties. Both these models confirmed the multipolar interactions as the main cause for concentration quenching after 3.0 mol% of Europium(III) content. Various other radiative properties such as decay-time, quantum efficiency, non-radiative relaxation rates were also determined. Red light parameters like Color Coordinate Temperature and Commission International de I'Eclairage color coordinates were also evaluated which confirmed the potential candidature of the prepared nanophosphors for the most recent version of wLEDs, lasers, sensors, advanced solar cells, etc.

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“…White light can be realized by coordinating the ratio of blue light and yellow light. [6][7][8][9][10][11] Sehrawat et al prepared cold white light-emitting perovskite SrLa 2 A1 2 -O 7 :Dy 3+ nanophosphors. 10 Xu et al 11 studied the luminescent properties of Sr 4 Ca(PO 4 ) 2 SiO 4 :Dy 3+ .…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9][10][11] Sehrawat et al prepared cold white light-emitting perovskite SrLa 2 A1 2 -O 7 :Dy 3+ nanophosphors. 10 Xu et al 11 studied the luminescent properties of Sr 4 Ca(PO 4 ) 2 SiO 4 :Dy 3+ . When the doping concentration of Dy 3+ ion is equal to 0.04, the phosphor emits cold white light, and the luminescent intensity increases by 1.7 times when the charge compensation Li + ion is added.…”

Section: Introductionmentioning

confidence: 99%

Luminescence and energy transfer of warm white-emitting phosphor Mg₂Y₂Al₂Si₂O₁₂:Dy³⁺,Eu³⁺ for white LEDs

et al. 2021

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An effective emission of characteristic cool white light from Dy3+ doped perovskite type SrLa2Al2O7 nanophosphors in single-phase pc WLEDs

Cited by 79 publications

References 41 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

Optical, crystallographic and Judd–Ofelt analysis of europium doped Sr6Y2Al4O15 nanocrystals for NUV-WLED fabrication

Luminescence and energy transfer of warm white-emitting phosphor Mg₂Y₂Al₂Si₂O₁₂:Dy³⁺,Eu³⁺ for white LEDs

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An effective emission of characteristic cool white light from Dy3+ doped perovskite type SrLa2Al2O7 nanophosphors in single-phase pc WLEDs

Cited by 79 publications

References 41 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

Optical, crystallographic and Judd–Ofelt analysis of europium doped Sr6Y2Al4O15 nanocrystals for NUV-WLED fabrication

Luminescence and energy transfer of warm white-emitting phosphor Mg2Y2Al2Si2O12:Dy3+,Eu3+ for white LEDs

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Luminescence and energy transfer of warm white-emitting phosphor Mg₂Y₂Al₂Si₂O₁₂:Dy³⁺,Eu³⁺ for white LEDs