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- W2102338763 abstract "Y1−xBO3:Eux3+ (0.07 ≤ x ≤ 0.5 moles) and Y0.7−2x (Gdx, Alx)BO3:Eu3+0.3 (0.05 ≤ x ≤ 0.3 moles) powder phosphors have been synthesized by a novel co-precipitation technique followed by heat treatment. Luminescence optimization was carried out by optimizing the dopant Eu3+ concentration, substitution of Y3+ with Gd3+/Al3+ and finally with SiO2 shell coating. The inversion symmetry of Eu3+ ions were lowered with Eu3+ concentration and substitution of Y3+ with Gd3+/Al3+, respectively. It has been noted that the intensity behavior of PL peaks of Eu3+:5D0 → 7F1, 5D0 → 7F2 are not only sensitive to the inversion symmetry of Eu3+ ions, but also to the monitoring excitation wavelengths. Due to nanosize particle distribution, the optimum activator (Eu3+) concentration (30 mol%) was found to be extremely at higher level, compared to the bulk phosphors. The asymmetric ratio (red/orange) and color purity of the optimized phosphors, Y0.7BO3:Eu0.33+ (with crystallite size, D = 32 nm) and Y0.3Gd0.2Al0.2BO3:Eu3+ (D = 17 nm) were further enhanced with an SiO2 coating. Based on the systematic study, the nanophosphor Y0.7BO3:Eu0.33+@SiO2 with an R/O ratio as 6.710 and color coordinates (x = 0.6612, y = 0.3357) is optimized as a remarkable phosphor having superior features than the commercial, available literature data results." @default.
- W2102338763 created "2016-06-24" @default.
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- W2102338763 date "2013-01-01" @default.
- W2102338763 modified "2023-10-18" @default.
- W2102338763 title "Luminescence optimization with superior asymmetric ratio (red/orange) and color purity of MBO<sub>3</sub>:Eu<sup>3+</sup>@SiO<sub>2</sub>(M = Y, Gd and Al) nano down-conversion phosphors" @default.
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- W2102338763 doi "https://doi.org/10.1039/c2ra21304d" @default.
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