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- W2600998590 abstract "Abstract Novel chemical vapor deposition (CVD) process was successfully developed for the growth of Sr 2 Si 5 N 8 :Ce 3+ phosphors with elevated luminescent properties. Metallic strontium was used as a vapor source for producing Sr 3 N 2 vapor to react with Si 3 N 4 powder via a homogeneous gas-solid reaction. The phosphors prepared via the CVD process showed high crystallinity, homogeneous particle size ranging from 8 to 10 μm, and high luminescence properties. In contrast, the phosphors prepared via the conventional solid-state reaction process exhibited relative low crystallinity, non-uniform particle size in the range of 0.5–5 μm and relatively lower luminescent properties than the phosphors synthesized via the CVD process. Upon the blue light excitation, Sr 2−x Ce x Si 5 N 8 phosphors exhibited a broad yellow band. A red shift of the emission band from 535 to 556 nm was observed with the increment in the doping amount of Ce 3+ ions from x = 0.02 to x = 0.10. The maximum emission was observed at x = 0.06, and the external and internal quantum efficiencies were calculated to be 51% and 71%, respectively. Furthermore, the CVD derived optimum Sr 1.94 Ce 0.06 Si 5 N 8 phosphor exhibited sufficient thermal stability for blue-LEDs and the activation energy was calculated to be 0.33 eV. The results demonstrate a potential synthesis process for nitride phosphors suitable for light emitting diodes." @default.
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- W2600998590 date "2017-03-31" @default.
- W2600998590 modified "2023-10-10" @default.
- W2600998590 title "Synthesis of Sr2Si5N8:Ce3+ phosphors for white LEDs via efficient chemical vapor deposition" @default.
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- W2600998590 doi "https://doi.org/10.1038/srep45832" @default.
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