| 摘要 |
<p>A red phosphor where the crystal phase constituting the phosphor is monoclinic Eu-activated CaAlSiN 3 . A red phosphor which is Eu-activated CaAlSiN 3 powder having an average particle diameter of 10 µm or less as measured in the non-pulverized state by the laser scattering particle size distribution analysis. A light-emitting device comprising a blue light-emitting element, a yellow phosphor capable of converting the blue light emitted from the blue light-emitting element into yellow light, and the above-described red phosphor capable of converting the blue light emitted from the blue light-emitting element into red light. A method for producing Eu-activated CaAlSiN 3 , comprising firing a raw material powder comprising Ca 3 N 2 , AlN, Si 3 N 4 and EuN at 1,400 to 2,000°C in a nitrogen-containing atmosphere, the Ca 3 N 2 , AIN and Si 3 N 4 giving a composition falling in the region surrounded by a straight line connecting the following four points A to D in the composition diagram of Fig. 1, that is, the four points defined by the following molar ratios of (Ca 3 N 2 :AlN:Si 3 N 4 ):
Point A: (10:70:20)
Point B: (10:65:25)
Point C: (70:23:7)
Point D: (70:22:8),
and EuN being contained in an amount of 0.01 to 10 parts by weight as Eu per 100 parts by weight in total of Ca 3 N 2 , AIN and Si 3 N 4 .</p> |
