Patent ID: 9133391
Filing Date: 2015-09-15
Classification: C09K,H01L,H05B

Abstract:
1. A luminescent material which exhibits a luminescence peak in a wavelength ranging from 544 to 562 nm when excited with light having an emission peak in a wavelength ranging from 250 to 500 nm, the luminescent material having a composition represented by Formula 1 below: wherein M represents Sr and a part of Sr may be substituted by at least one selected from Ba, Ca, and Mg; x, y, z, u, and w satisfy following conditions: 0<x≦1, 0.8≦y≦1.1, 2≦z≦3.5, u≦1, 1.8≦z−u, and 13≦u+w≦15, and wherein a crystal of the luminescent material has an orthorhombic system and belongs to a space group Pna2