| 主权项 |
1. A light emitting device comprising:
a light emitting element having a peak light emission wavelength of from 400 nm to 455 nm; a first fluorescent material that is represented by formula (I) and has a peak fluorescence wavelength in a range of from 650 nm to 670 nm; and a second fluorescent material that has a peak fluorescence wavelength in a range of from 520 nm to 550 nm, wherein the light emitting device exhibits a light emission spectrum with an average light emission strength of 6% or less in a range of from 600 nm to 620 nm, when the maximum light emission strength in a range of from 400 nm to 455 nm is taken as 100%;
(x-a) MgO.a(Ma)O.b/2(Mb)2O3.yMgF2.c(Mc)X2.(1-d-e)GeO2.d(Md)O2.e/2(Me)2O3:M (I) wherein Ma is at least one element selected from the group consisting of Ca, Sr, Ba, and Zn; Mb is at least one element selected from the group consisting of Sc, La, and Lu; Mc is at least one element selected from the group consisting of Ca, Sr, Ba, and Zn; X is at least one element selected from the group consisting of F and Cl; Md is at least one element selected from the group consisting of Ti, Sn, and Zr; Me is at least one element selected from the group consisting of B, Al, Ga, and In; and x, y, a, b, c, d, and e satisfy 2≦x≦4, 0<y≦2, 0≦a≦1.5, 0≦b<1, 0≦c≦2, 0≦d≦0.5, 0≦e<1, and 0<d+e<1, respectively. |
