Long afterglow energy storage luminescent material is a kind of photoluminescence material. Its excitation energy is light. It can be any ambient light, such as sunlight, light, etc. The basic luminous principle of this material is: during the preparation of the material, the doped elements form the luminous center and the trap center in the matrix. When excited by an external light source, the ground state electrons of the luminous center transition to the excited state. When an electron transitions from an excited state to a ground state, it emits light.

At the same time, some electrons are trapped in the center of the trap when stimulated. After the light is turned off, the electrons bound to the trap jump out of the trap and fall to the ground state due to the interference of the ambient temperature. The released energy excites the luminous center to form light. Because the electrons bound to the trap are gradually out of the trap due to the interference of the ambient temperature, the light emission appears as a long process, which forms a long afterglow.

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Long afterglow luminescent materials emit light for a long time in a dark environment, so this material is commonly referred to as “luminous powder.” There are two main types of traditional luminous powders: sulfide types include ZnS, cars, etc. The chemical properties of these materials are relatively unstable, and they are easily hydrolyzed or photolyzed by water and ultraviolet rays: hours and a shorter life.

The radiation-excitation type uses radiant energy emitted by a radioactive substance incorporated in material as an excitation source and excites a light-emitting center to emit light. Such materials are harmful to the environment and human health because they contain radioactive materials and have been banned from use in most countries.

A new type of long afterglow luminescent material was discovered in the 1990s. It is completely different from the traditional sulfide and radiation-excitation noctilucent materials. It does not contain any harmful elements, has stable performance, and long afterglow time. This material uses aluminate ceramic material as the matrix and rare earth material as the doping element forming the luminous center and the trap center and has a good night-time display function.

glow in the dark powder brightness