| abstract |
A phosphor that emits light from green to yellow capable of obtaining a light-emitting device having high color rendering properties and high luminance, a light-emitting device using the phosphor, an image display device including the light-emitting device, and illumination Providing equipment. A phosphor comprising a compound represented by formula (I) containing a compound having a garnet structure as a host and containing a metal element of a luminescent center ion in the host. M 1 a M 2 b X c M 3 d M 4 3 O e (I) [M 1 is Mg and / or Zn, M 2 is a divalent metal element excluding Mg and Zn, and X is mainly Ce. The metal element of the luminescent center ion, M 3 is a trivalent metal element excluding X, M 4 is a tetravalent metal element, and a, b, c, d, and e are numbers that satisfy the following equations, respectively: It is. 0.001 ≦ a ≦ 0.5, 2.5 ≦ b ≦ 3.3, 0.005 ≦ c ≦ 0.5, 1.5 ≦ d ≦ 2.2, e = {(a + b) × 2 + (c + d ) × 3 + 12} / 2] A light emitting device is formed from the light emitting diode and the phosphor-containing resin portion. [Selection figure] None |