Light emitting device with resin layer containing blue, green and red emitting phosphors which emits white light when excited by ultraviolet light
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United States of America Patent
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Apr 10, 2012
Grant Date -
Sep 20, 2007
app pub date -
Sep 8, 2005
filing date -
Sep 22, 2004
priority date (Note) -
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Abstract
A light emitting device 1 has, as a light source, a light emitting semiconductor element such as a light emitting diode 2. Light radiated from the light emitting diode 2 is converted to visible light in a light emitting part 8 having a plurality of phosphors 9 different in emission color, and the visible light is emitted. In such a light emitting device 1, a maximum value (Δx, Δy) of color difference (absolute value) between emission chromaticity (x, y) and emission chromaticity (x1, y1) satisfies conditions of Δx<0.05 and Δy<0.05, where (x, y) is emission chromaticity measured directly above the light source and (x1, y1) is emission chromaticity measured for each of front lights and side leakage lights in all directions from the light emitting device 1.
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