摘要:
A display screen having a phosphor coating comprising a phosphor composition of a phosphor provided with a coating which comprises one or more oxgyen compounds of the elements zinc, aluminium, magnesium, calcium and barium as well as colloidal SiO.sub. particles, said colloidal SiO.sub.2 particles being composed of SiO.sub.2 particles having an average size of 4 nm.ltoreq.d.ltoreq.30 nm, corresponding to a specific surface of 100 m.sup.2 /g.ltoreq.A.sub.s .ltoreq.550 nm m.sup.2 /g, and SiO.sub.2 particles having an average size of 50 nm.ltoreq.d.ltoreq.150 nm, corresponding to a specific surface of 25 m.sup.2 /g.ltoreq.A.sub.s .ltoreq.70 m.sup.2 /g.