Photoluminescent Pigments

A common photoluminescent pigment is an inorganic material known as strontium aluminate (also identified as SrAl). These SrAl materials can be combined or doped with various proprietary inorganics to change the color and after glow intensity and time of afterglow of photoluminescent products.

Alternative to strontium aluminate pigment is zinc sulfide doped with copper. The use of these pigments is limited as they offer only a single color of glow in the dark. These zinc sulfide based pigments have existed for over a century and are common in novelty items.  These materials are easily damaged when exposed to sun.

A major variable in controlling the intensity of after glow is the particle size of the pigment and loading volume.

These pigments are available with surface coatings to allow dispersion in water and nonaqueous solvents. They are also available as masterbatch to be added to a variety of plastics.