Light-emitting materials, generally refers to materials that can emit visible light. It is said that during the period of Emperor Taizong of the Song Dynasty, the Japanese presented a painting, nothing could be seen during the day, but at night a lying cow could be seen. When we found out the reason

(1) the product particle size of energy storage luminescent materials. Previously, the particle size can not be too fine, generally controlled at 180 ~ 300 mesh is appropriate, because too fine will destroy the intrinsic structure of its crystal, directly affecting its luminous brightness and afterg