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

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Abstract

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 Ca9Dy0.03Al0.97(PO4)7 sample 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 Å 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 11,332 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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Acknowledgements

One of the authors, Manju Dahiya is thankful for financial help in the form of a senior research fellowship from the Council of Scientific and Industrial Research, India (CSIR), New Delhi, India (Award No. 09/1063/0014/2017-EMR-I).

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  1. Department of Chemistry, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonepat, 131039, India

    Manju Dahiya & Dinesh Kumar

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  1. Manju Dahiya
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Dahiya, M., Kumar, D. Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation. J Mater Sci: Mater Electron 32, 17241–17252 (2021). https://doi.org/10.1007/s10854-021-06201-0

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