Nanoparticles of erbium oxide are a pink powder with the chemical formula Er₂O₃ and a boiling point of 3900°C. They have a wide range of applications.

As a doping material for fiber amplifiers, they can achieve efficient amplification of optical signals around the wavelength of 1550nm, significantly increasing the transmission distance and capacity of fiber optic communication systems.

When added to phosphors, erbium oxide nanoparticles can improve luminescent performance, making the emitted light more pure in color and higher in brightness. This makes them useful in the manufacturing of lighting devices such as light-emitting diodes (LEDs), enhancing lighting quality and efficiency.

In semiconductor manufacturing, they can be used to form high-quality gate oxide films, which improve the performance and stability of transistors, reduce leakage current, and contribute to the miniaturization and high performance of chips.