E 1776 (OTTO) Europium(III) sulphate, octahydrate, 99.9% Cas 10031-55-7 - used as a phosphor activator for color cathode-ray tubes and liquid-crystal displays. E 1776 (OTTO) Europium(III) sulphate, octahydrate, 99.9% Cas 10031-55-7 - used in computer monitors and televisions.