Used primarily in glow-in-the-dark applications due to its strong and long-lasting phosphorescence. Commonly found in emergency signage, watch dials, and decorative paints where visibility in the dark is essential. Also used in novelty items like toys, stickers, and artistic coatings. Its brightness and durability make it superior to older zinc sulfide-based phosphors. Additionally employed in some security inks and industrial markings for low-light readability.