Effect of substitution of nitrogen ions to red-emitting Sr sub(3)B sub(2)O sub(6-3/2x)N sub(x):Eu super(2+) oxy-nitride phosphor for the application to white LED

The luminescence properties of orange-red-emitting Eu super(2+) activated Sr sub(3)B sub(2)O sub(6-3/2x)N sub(x) were optimized for application to blue/near UV light-emitting diodes (LEDs). Sr sub(3)B sub(2)O sub(6-3/2x)N sub(x):Eu super(2+) phosphor showed broad orange-red emission peaking at 600-650 nm under blue and n-UV excitations of 450 and 360 nm, respectively; the emission peak of phosphor was affected by nitrogen ion substitution. Boron nitride raw materials affect luminescence properties of phosphor; a small amount of BN reacts as a flux for synthesis of Sr sub(3)B sub(2)O sub(6) and a large amount of BN helps Sr sub(3)B sub(2)O sub(6-3/2x)N sub(x):Eu super(2+) phosphor to have longer-wavelength emission peak. A 447 nm-emitting blue LED-pumped white LED with a mixture of Sr sub(3)B sub(2)O sub(6-3/2x)N sub(x):Eu super(2+) (x=1) and Ba sub(2)SiO sub(4):Eu super(2+) green-emitting phosphor was fabricated; it is observed that it showed color coordinates of (0.3648, 0.3605) and CRI value of 96.