| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light emitting device having a superior luminescence characteristic with little color shift in an LED light emitting device where a temperature tends to rise during driving. <P>SOLUTION: The light emitting device includes a light emitting element emitting light having a main emission peak in a wavelength region of 360 nm to 500 nm, and a phosphor layer containing a phosphor receiving light emitted from the light emitting element. A junction temperature of the light emitting element is 125°C or more. At least part of the phosphor absorbs light that the light emitting element emits and has the main emission peak of 500 nm to 600 nm, and has composition expressed by a formula (1): (Sr<SB>a</SB>, Ba<SB>b</SB>, Ca<SB>z</SB>, Eu<SB>w</SB>)<SB>2</SB>SiO<SB>4</SB>(in formula (1), values of (a), (b), (z) and (w) satisfy a formula (2): a+b+z+w=1, a formula (3): 0.1≤a/(1-w)≤0.8, a formula (4): 0.2≤b/(1-w)≤0.9, a formula (5): 0≤z/(1-w)≤0.2 and a formula (6): 0.005≤w≤0.2). <P>COPYRIGHT: (C)2008,JPO&INPIT |
