| 摘要 |
The invention concerns a light emitting device comprising a light emitting structure capable of emitting primary light of a wavelength less then 480 nm and a luminescent screen comprising a phosphor of general formula (Sr<SUB>1-a-b</SUB>Ca<SUB>b</SUB>Ba<SUB>c</SUB>Mg<SUB>d</SUB>Zn<SUB>e</SUB>)Si<SUB>x</SUB>N<SUB>y</SUB>O<SUB>z</SUB>:Eu<SUB>a</SUB>, wherein 0.002<=a<=0.2, 0.0<=b<=0.25, 0.0<=c<=0.25, 0.0<=d<=0.25, 0.0<=e<=0.25, 1.5<=x<=2.5, 1.5<=y<=2.5 and 1.5<=z<=2.5. The invention also concerns a luminescent screen comprising a phosphor of general formula (Sr<SUB>1-a-b</SUB>Ca<SUB>b</SUB>Ba<SUB>c</SUB>Mg<SUB>d</SUB>Zn<SUB>e</SUB>)Si<SUB>x</SUB>N<SUB>y</SUB>O<SUB>z</SUB>:Eu<SUB>a</SUB>, wherein 0.002<=a<=0.2, 0.0<=b<=0.25, 0.0<=c<=0.25, 0.0<=d<=0.25, 0.0<=e<=0.25, 1.5<=x<=2.5, 1.5<=y<=2.5 and 1.5<=z<=2.5. The invention also concerns a phosphor of general formula (Sr<SUB>1-a-b</SUB>Ca<SUB>b</SUB>Ba<SUB>c</SUB>Mg<SUB>d</SUB>Zn<SUB>e</SUB>)Si<SUB>x</SUB>N<SUB>y</SUB>O<SUB>z</SUB>:Eu<SUB>a</SUB>, wherein 0.002<=a<=0.2, 0.0<=b<=0.25, 0.0<=c<=0.25, 0.0<=d<=0.25, 0.0<=e<=0.25, 1.5<=x<=2.5, 1.5<=y<=2.5 and 1.5<z<2.5.
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