Phosphor and manufacturing method of the same, and light emitting device using the phosphor
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United States of America Patent
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Nov 4, 2008
Grant Date -
Oct 5, 2006
app pub date -
Sep 6, 2005
filing date -
Mar 31, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
To provide a phosphor having a broad emission spectrum in a range of blue color (peak wavelength from 400 nm to 500 nm), having a broad and flat excitation band in the range of near ultraviolet/ultraviolet, and having excellent emission efficiency and emission intensity/luminance. The phosphor is expressed by a general composition formula MmAaBbOoNn:Z (where element M is at least one or more kind of element having bivalent valency, element A is at least one or more kind of element having tervalent valency, element B is at least one or more kind of element having tetravalent valency, O is oxygen, N is nitrogen, and element Z is at least one or more kind of element acting as an activator.), satisfying 5.0<(a+b)/m<9.0, 0.ltoreq.a/m.ltoreq.2.0, 0.ltoreq.o
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