Integrated Afterglow and Self‐Trapped Exciton Emissions in Hybrid Metal Halides for Anti‐Counterfeiting Applications

Abstract 0D hybrid metal halides (0D HMHs) are considered to be promising luminescent emitters. 0D HMHs commonly exhibit self‐trapped exciton (STE) emissions originating from the inorganic metal halide anion units. Exploring and utilizing the emission features of the organic cation units in 0D HMHs is highly desired to enrich their optical properties as multifunctional luminescent materials. Here, tunable emissions from organic and inorganic units are successfully achieved in triphenylsulfonium (Ph 3 S + )‐based 0D HMHs. Notably, integrated afterglow and STE emissions with adjustable intensities are obtained in (Ph 3 S) 2 Sn 1− x Te x Cl 6 ( x = 0–1) via the delicate combination of [SnCl 6 ] 2− and [TeCl 6 ] 2− . Moreover, such a strategy can be readily extended to develop other HMH materials with intriguing optical properties. As a demonstration, 0D (Ph 3 S) 2 Zn 1− x Mn x Cl 4 ( x = 0–1) are constructed to achieve integrated afterglow and Mn 2+ d–d emissions with high efficiency. Consequently, these novel 0D HMHs with colorful afterglow and STE emissions are applied in multiple anti‐counterfeiting applications.