Pressure-Induced Emission Luminogens from Antimony Chloride Dimers Toward White-Light Emission Harvesting

Abstract

The pressure-induced emission (PIE) properties of low-dimensional organic-inorganic hybrid perovskites (OIHPs) have attracted considerable interest due to their capacity of enhancing luminescent efficiency. Here, a high-pressure processing strategy is demonstrated to significantly improve the photoluminescent efficiency of the 0D OIHP [3-FPEA]₆(Sb₂Cl₁₀)^*2Cl. Notably, [3-FPEA]₆(Sb₂Cl₁₀)^*2Cl with blue emission at ambient conditions achieved a white-light emission after pressure treatment of 30.0 GPa. The white-light emission is mainly the result of the cooperative emission of the singlet state emission of organic molecules and the self-trapped excitons (STEs) emission related to inorganic octahedra. This irreversible emission transformation correlates with pressure-induced permanent structural amorphization and the pronounced steric hindrance imparted by the conformationally bulky 3-FPEA cations. Moreover, a marked piezochromism from blue emission to yellow emission in compressed [3-FPEA]₆(Sb₂Cl₁₀)^*2Cl is observed, which is associated with the energy transfer from organic components to inorganic components under pressure. Furthermore, the distortion of the inorganic octahedron and the weakening of hydrogen bond vibrations are the key factors contributing to the enhancement of the yellow light. This study provides a new perspective on the modulation of coordinated emission originated from organic and inorganic components in OIHPs materials and a new platform for the development of high-quality single-component white-light-emitting materials.