Phosphors for a display, which emit blue light and green light, comprise
zinc sulfide phosphors having a crystal structure of a hexagonal system.
The zinc sulfide phosphor which emits blue light has an average particle
diameter in a range of (0.0169.times.V.sub.E.sup.1.9 +2.49).+-.20%[.mu.m]
when an electron beam has an acceleration voltage V.sub.E. The zinc
sulfide phosphor which emits green light has an average particle diameter
in a range of (0.017.times.V.sub.E.sup.1.9 +2.58).+-.20%[.mu.m]. A
phosphor for a display, which emits red light, comprises a yttrium
oxysulfide phosphor or a yttrium oxide phosphor and has an average
particle diameter in a range of (0.023.times.V.sub.E.sup.1.95
+2.88).+-.20%[.mu.m]. These phosphors for a display are used for a display
which has an electron beam having an acceleration voltage of 3 kV to 15 kV
as an excitation source.
