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- W3206577095 abstract "Eu{sup 2+}-doped BaSi{sub 6}N{sub 8}O phosphors (Ba{sub 1-x}Eu{sub x}Si{sub 6}N{sub 8}O, 0.005<=x<=0.2) were synthesized by gas-pressure sintering of the powder mixture of BaCO{sub 3}, Si{sub 3}N{sub 4}, and Eu{sub 2}O{sub 3} at 1750 deg. C under 0.5 MPa N{sub 2}. The fired powder consists of a major BaSi{sub 6}N{sub 8}O phase and a trace amount of impurity phases. The structural result of the BaSi{sub 6}N{sub 8}O powder, refined by the Rietveld method, agrees well with that of single crystals. A wide blue luminescence band peaking at about 500 nm is observed in BaSi{sub 6}N{sub 8}O:Eu{sup 2+}, upon excitation with the ultraviolet light of 310 nm. Although Eu is covalently bonded to six nearest neighbor nitrogen atoms, the luminescence of Eu{sup 2+} is not significantly redshifted but shows a very narrow excitation spectrum at high energies. The origin of the short-wavelength luminescence is mainly ascribed to a small crystal-field splitting as a result of extremely long distances between europium and nitrogen ligands in BaSi{sub 6}N{sub 8}O:Eu{sup 2+}." @default.
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- W3206577095 date "2010-02-15" @default.
- W3206577095 modified "2023-09-27" @default.
- W3206577095 title "Photoluminescence of (Ba{sub 1-x}Eu{sub x})Si{sub 6}N{sub 8}O (0.005<=x<=0.2) phosphors" @default.
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