“…RESA has been employed in a variety of commodities, such as switches, safety marks, luminous ornamental articles, decorations, and directional signs. This can be attributed to its photostability, durability, and long-persistent luminescence. − There are a variety of known rare-earth doped phosphors with the ability to emit the different primary colors, such as Y 2 O 2 S:Eu 3+ , Mg 2+ , Ti 4+ and CaS:Eu 2+ , Tm 3+ , Ce 3+ for red emissions, MgAl 2 O 4 :Mn 2+ and SrAl 2 O 4 : Eu 2+ , Dy 3+ for green emissions, and CaMgSi 2 O 6 :Eu 2+ , Dy 3+ and CaAl 2 O 4 :Eu 2+ , Nd 3+ for blue emissions . However, it proved to be one of the best long-lasting phosphors due to its distinctive brightness, nontoxicity, non-radioactivity, thermal and photostability, long-persistence time (>10 h), recyclability, and resistance to chemicals.…”