Structure and luminescent properties of Dy3+ activated NaLa9(SiO4)6O2 yellow-emitting phosphors for application in white LEDs - Archive ouverte HAL
Article Dans Une Revue Journal of Alloys and Compounds Année : 2022

Structure and luminescent properties of Dy3+ activated NaLa9(SiO4)6O2 yellow-emitting phosphors for application in white LEDs

Résumé

A series of NaLa9-xDyx(SiO4)6O2 (NLSO:xDy, x = 0 – 0.3) apatite phosphors were synthesized by solid-state reaction at 1100 °C. Their crystal structure, morphology and particle size distribution, electronic structure, Raman spectra, as well as concentration- and temperature-dependent luminescent properties were investigated for the first time. The crystal structure is refined by the Rietveld method. Undoped NLSO is hexagonal (space group P63/m – C2 6h) with lattice constants a = b = 9.6917(3) Å and c = 7.1836(4) Å. Dy3+ ions substitute for the La3+ ones in two types of sites. The first-principle calculations for undoped NLSO reveal an indirect bandgap of 5.06 eV. The photoluminescence properties were investigated in detail through the measurements of the emission spectra and luminescence decay curves. The NLSO:0.2Dy phosphor exhibited the typical Dy3+ emission corresponding to 4F9/2 →6HJ transitions, among which the hypersensitive electric-dipole transition 4F9/2→6H13/2 (571 nm) dominates in the spectrum leading to yellow emission color with CIE chromaticity coordinates of (0.469, 0.495) and a correlated color temperature of 3150 K. The concentration quenching mechanism for Dy3+ ions was investigated. Excellent thermal stability was found for this new apatite phosphor. The obtained results indicated that NLSO:xDy apatites are promising as potential yellow emitting phosphors for applications in w-LEDs.
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hal-03858690 , version 1 (17-11-2022)

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Sami Slimi, Pavel Loiko, Kirill Bogdanov, Anna Volokitina, Rosa Maria Solé, et al.. Structure and luminescent properties of Dy3+ activated NaLa9(SiO4)6O2 yellow-emitting phosphors for application in white LEDs. Journal of Alloys and Compounds, 2022, 896, pp.163109. ⟨10.1016/j.jallcom.2021.163109⟩. ⟨hal-03858690⟩
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