Glow in the dark pigment currently on the market is mainly divided into two categories: Strontium Aluminate powders and short-acting luminous powders with Zinc Sulfide.
Glow in the dark pigment belongs to the former. It has powerful light absorption, light storage, and luminescence. It is a light-excited and light-storing luminescent powdery crystals, after being irradiated by natural light, daylight light, ultraviolet light, etc. And then slowly releases it in a fluorescent manner after stopping light irradiation. So at night or in a dark place, we can still see the light, lasting for several hours to ten hours.
The short-acting luminescent powder containing zinc sulfide has a name called “come fast, go fast.”The so-called “come fast” means that the light absorption time is short and sensitive to the light source. And it quickly shows the luminous effect: “go fast” means that the afterglow time is short.
Its afterglow time is only 1 to 3 hours. It is easy to deteriorate and darken in strong light (such as sunlight), ultraviolet light, and humid air. Hence, its application is limited in many fields. Adding diamond and copper co-activated ZnS luminous powder has a long afterglow time. But it has an infrared quenching phenomenon. After being illuminated by electric light (including more red light), the afterglow quickly extinguishes.
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