High-purity erbium oxide is used to prepare quantum dot materials. The precise control of erbium ion concentration and distribution can adjust the luminescence characteristics of quantum dots. In quantum dot display technology, it is used as a light-emitting element to enable devices such as quantum dot TVs to present a higher color gamut and better color performance.

High-purity erbium oxide participates in tri-color phosphors to adjust the luminous color and intensity of the phosphors. It works synergistically with other rare earth element compounds to make the light emitted by fluorescent lamps closer to natural light and improve the comfort of lighting, such as in fluorescent lamps.

In multilayer ceramic capacitors, high-purity erbium oxide can optimize the ceramic crystal structure, stabilize the dielectric constant, reduce losses, and improve energy storage density and working stability. The high-performance capacitors made from this are widely used in computer electronic equipment to ensure stable circuit operation.