Why is the luminous clock green?

According to Cai Hui's inquiry. The luminous clock is coated with luminous powder on the dial and hands. This color-changing pigment is a new type of rare earth aluminate material, which is based on powdered zinc sulfide. It does not emit light itself, but it has phosphorescence characteristics, that is, it is also called luminescent self-luminous pigment luminous powder when it is excited after sunlight or light irradiation. It is refined by adding high temperature additives and other external ions on the basis of traditional rare earth aluminate luminescent materials and adopting a unique formula and treatment process. Its appearance is light green and light yellow, and its luminous colors are yellow-green, blue-green and green respectively. It has a strong absorption capacity for short-wave visible light with a wavelength below 450 nm. By absorbing all kinds of natural light or artificial light, it can realize self-luminous function in the dark state and can be recycled indefinitely. Therefore, the luminous clock is light green, which is caused by materials.