Photoluminescent materials are substances that can absorb light and then re-emit it. When these materials are exposed to a light source, they store energy and release it slowly, producing a glow. This phenomenon is commonly seen in glow-in-the-dark products, which often use photoluminescent pigments. These materials are used in various applications, including safety signs, watch dials, and decorative items. The effectiveness of photoluminescent materials depends on their chemical composition and the intensity of the light they absorb. Common examples include zinc sulfide and strontium aluminate, which are popular for their bright and long-lasting glow.