Self-trapped exciton to dopant energy transfer in Sb3+-doped Cs2ZrCl6 perovskite variants

Abstract

As a promising way to modulate the photoluminescence properties and stability of perovskites and perovskite variants, doping has attracted wide attention in the field of optical and optoelectronic applications. In this work, a series of all inorganic lead-free Sb³⁺-doped Cs₂ZrCl₆ vacancy-ordered perovskite variants were prepared by the hydrothermal method, and the Sb³⁺-doping leads to singlet and triplet state emissions, which are strongly dependent on the temperature and surrounding molecular environment. Furthermore, efficient energy transfer can be observed from self-trapped excitons (STEs) of [ZrCl₆]²⁻ octahedra to dopant Sb³⁺. Our results will shed light on the ns² Sb³⁺-ion-doping-induced emissive mechanism and expand the understanding of the optoelectronic properties of the perovskite variant family.