Novel Red Mechanoluminescence in Mn‐Doped ZnGa₂S₄ Crystal Phosphors via a Molten Salt Shielding Method

Abstract Owing to their unique characteristic of direct mechanical‐to‐optical energy conversion, mechanoluminescence (ML) crystals have drawn considerable interest for visible stress sensing, flexible and stretchable displays, advanced anti‐counterfeiting. However, among the emissions synthetic ML materials, high‐performance red‐emission semiconductors with ideal color‐rendering indices are relatively scarce, which restricts future applications. In this work, red emission CIE coordinates (0.6395 0.3572) in Mn‐doped ZnGa 2 S 4 prepared by a molten salt shielding synthesis method air is reported. has cubic crystal structure composed layered [ZnS ] tetrahedral unit that plays an important role efficient ML. Based on density functional theory calculations, relationship between performance revealed, will help development new high‐quality materials. The Mn‐doping causes slight deformation structure, leading band bending formation features response mechanical stimuli. deep‐red :Mn holds great promise stable displays force/pressure sensor