Photoluminescence of Singlet/Triplet Self-Trapped Excitons in Sb3+-Based Metal Halides

Emerging lead-free metal halides with low toxicity and unparalleled optoelectronic properties have attracted growing research interests, also demonstrating extensive application potentials. Among these, Sb3+-based all-inorganic/organic-inorganic hybrid metal halides become a vital group due to the special energy level distribution along with diverse optical properties. However, there remains a gap in understanding the relationship between the crystal structure and the radiation process of involved Sb3+ emission. Herein, the existing reports about Sb3+-based luminescent metal halides are revisited and their structure-luminescence-application relationship is explored, and it is further established that the triplet self-trapped excitons (STEs) emission of Sb3+ varies in different crystallographic environments and endows tunable luminescent performance. This work aims to provide constructive strategies in the further exploitation of Sb3+-based metal halides, and also guides the structural design and photoluminescence tuning of doped metal halide materials.

Automated summary

This passage discusses the relationship between the crystal structure and luminescent properties of Sb3+-based luminescent metal halides, highlighting that Sb3+ emission varies in different crystallographic environments, allowing for tunable luminescent performance.