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-bCa.sub.bBa.sub.cMg.sub.dZn.sub.e)Si.sub.xN.sub.yO.sub.z:Eu.s- ub.a, wherein 0.002.ltoreq.a.ltoreq.0.2, 0.0.ltoreq.b.ltoreq.0.25, 0.0.ltoreq.c.ltoreq.0.25, 0.0.ltoreq.d.ltoreq.0.25, 0.0.ltoreq.e.ltoreq.0.25, 1.5.ltoreq.x.ltoreq.2.5, 1.5.ltoreq.y.ltoreq.2.5 and 1.5.ltoreq.z.ltoreq.2.5. The invention also concerns a luminescent screen comprising a phosphor of general formula (Sr.sub.1-a-bCa.sub.bBa.sub.cMg.sub.dZn.sub.e)Si.sub.xN.sub.yO.sub.z:Eu.s- ub.a, wherein 0.002.ltoreq.a.ltoreq.0.2, 0.0.ltoreq.b.ltoreq.0.25, 0.0.ltoreq.c.ltoreq.0.25, 0.0.ltoreq.d.ltoreq.0.25, 0.0.ltoreq.e.ltoreq.0.25, 1.5.ltoreq.x.ltoreq.2.5, 1.5.ltoreq.y.ltoreq.2.5 and 1.5.ltoreq.z.ltoreq.2.5. The invention also concerns a phosphor of general formula (Sr.sub.1-a-bCa.sub.bBa.sub.cMg.sub.dZn.sub.e)Si.sub.xN.sub.yO.sub.z:Eu.s- ub.a, wherein 0.002.ltoreq.a.ltoreq.0.2, 0.0.ltoreq.b.ltoreq.0.25, 0.0.ltoreq.c.ltoreq.0.25, 0.0.ltoreq.d.ltoreq.0.25, 0.0.ltoreq.e.ltoreq.0.25, 1.5.ltoreq.x.ltoreq.2.5, 1.5.ltoreq.y.ltoreq.2.5 and 1.5