71st B.P.S.C. (Pre) 2025
Which compound is known as a night-glowing pigment from below?
aCopper sulphide-doped zinc oxide
bEuropium-doped strontium aluminate✓ Correct
cBarium sulphate-doped copper carbonate
dBoron oxide-doped copper sulphate
Explanation
Night-glowing pigments are substances that first absorb light energy and then keep emitting light slowly for a long time in darkness. Among the given options, europium-doped strontium aluminate is well-known and widely used as a night-glowing pigment.
general-science