| abstract |
A red nitride phosphor of formula (I) or (II), and two green phosphors of formulas (III) and/or (IV) are included.n nM w Al x Si y B z N ((2/3)w+x+(4/3)y+z) :Eu 2+ (I)n nM is any of Mg, Ca, Sr and Ba, and 0.5≦w≦3, x=1, 0.5≦y≦3 and 0≦z≦0.5,n nM p Si q N ((2/3)p+(4/3)q) :EU 2+ (II)n n1.5≦p≦2.5 and 4.5≦q≦5.5,n nM x MgSi z O a X b :Eu 2+ (III)n nM is any of Ca, Sr, Ba, Zn and Mn, X is any of F, Cl, Br and I, and 6.5≦x<8.0, 3.7≦z≦4.3, a=x+1+2z−b/2 and 1.0≦b≦1.9,n nSi c Al d O f N g :Eu 2+ (IV)n nc+d=6, 5.0≦c<6, 0<d≦1.0, 0.001<f≦1, 7≦g<8. |