Efficient Multicolor Emission Zn‐Sb‐Mn Chloride Scintillators: Large‐Scale Production for Multi‐Level Anti‐Counterfeiting, Information Storage, and X‐Ray Imaging

Abstract Achieving multiple efficient emissions from a single scintillator material is challenging. This work presents several Zn or Cd‐based halide materials with tetrahedral clusters, which show high‐efficiency, multicolor emission scintillating by co‐doping Sb 3 ⁺ and Mn 2 ⁺. In this 0D structure, Mn 2 ⁺ and Sb 3 ⁺ can function as independent emission centers, producing efficient green or red emission bands, respectively, all with photoluminescent quantum yields (PLQYs) exceeding 70% for green, yellow, and red emissions. Notably, Ph 3 M‐Zn:Sb 3+ @Mn 2 ⁺ out of the above compounds exhibits PLQY values exceeding 90% for all three color emissions. Furthermore, it demonstrates exceptional scintillation performance under X‐ray illumination, achieving a resolution of 18 lp mm −1 and a detection limit of 50.1 nGy air S⁻¹, surpassing most commercial scintillators. Additionally, the cross‐ and independent‐emission colors produced by these compounds under varying excitations have been utilized to develop novel optical anti‐counterfeiting and information storage applications with high security. These advances demonstrate that co‐doping with Sb 3 ⁺ and Mn 2 ⁺ significantly can optimize the optical performance of the host halide materials, for multifunctional scintillators in a variety of technological applications.