Precisely Manipulating the Self‐Reduction of Manganese in MgGa2O4 through Lithium Incorporation for Optical Thermometry and Anti‐Counterfeiting

• DOI: 10.1002/adom.202300600
• Publication Date: 2023-06-10T02:06:02Z
• Authors: Junpeng Xue; Ling Li; Marcin Runowski; Yue Guo; Bo Ram Lee; Jung Hyun Jeong; Peng Du; Sung Heum Park
• Keywords: Ionic radius; Persistent luminescence

Abstract Manganese (Mn) doped MgGa 2 O 4 (MGO) phosphors are prepared by a solid‐state reaction technique in air. Upon UV light excitation, the featured green and red emissions of Mn 2+ 4+ , respectively, detected Mn‐doped MGO phosphors, indicating incomplete self‐reduction behavior host lattices. To clarify behavior, theoretical calculations based on density functional theory bond energy performed. Moreover, can be manipulated incorporation Li + leading to precise regulation contents Based ionic radii, inhibited mechanism is triggered occupying tetrahedral Mg site, reduced occupancy sites ions, forcing take up octahedral Ga 3+ sites. Furthermore, afterglow properties with wide continuous multiple traps studied detail. Finally, unique luminescence their potential application ratiometric optical thermometer anti‐counterfeiting also systematically exploited.