Achieving Near‐unity Photoluminescence Quantum Yields in Organic‐Inorganic Hybrid Antimony (III) Chlorides with the [SbCl₅] Geometry

Abstract

Hybrid organic-inorganic antimony halides have attracted increasing attention due to the non-toxicity, stability, and high photoluminescence quantum yield (PLQY). To shed light on the structural factors that contribute to the high PLQY, five pairs of antimony halides with general formula A 2 SbCl 5 and A 2 Sb 2 Cl 8 are synthesized via two distinct methods and characterized. The A 2 SbCl 5 type adopts square pyramidal [SbCl 5 ] geometry with near-unity PLQY, while the A 2 Sb 2 Cl 8 adopts seesaw dimmer [Sb 2 Cl 8 ] geometry with PLQY � 0 %. Through combined data analysis with the literature, we have found that A 2 SbCl 5 series with square pyramidal geometry generally has much longer Sb•••Sb distances, leading to more expressed lone pairs of Sb III . Additional factors including SbÀ Cl distance and stability of antimony chlorides may also affect PLQY. Our targeted synthesis and correlated insights provide efficient tools to precisely form highly emissive materials for optoelectronic applications.

Tunable luminescence based on structural regulation in organic antimony halides for X-ray scintillation

“…A comparison is made between the band gap, the optical properties and Sb-Sb distance of these two halides and those of some antimony-based halides of the same structure that have been reported (Table 1). 29 The result shows that (NYP) 2 Sb 2 Cl 8 has a prolonged decay time and a smaller band gap than other A 2 Sb 2 Cl 8 halides. In addition, the luminescence properties of (NYP) 2 SbCl 5 and other five-coordinated Sb-based halides have been compared (Table S5 †).…”

Achieving Highly Efficient Orange Emission in Tin (IV)‐Based Metal Halides with Outstanding Anti‐Water Stability Through Antimony Doping and Reasonable Structural Modulation

“…Recent studies have shown that a longer Sb─Sb distance is beneficial for more expressed lone pairs of Sb 3+ to produce a confined STE, thus yielding highly efficient emission. [20] For close Sb─Sb distance in even distorted lattice imply a high concentration of emission centers in Sb 3+ -doped (TBP)SnCl 5 •DMF, the more electronphonon coupling and larger concentration quenching lead to stronger non-radiation processes. In our system, the PLQY of Sb 3+ -doped (TBP) 2 SnCl 6 is significantly higher than Sb 3+ -doped (TBP)SnCl 5 •DMF, which supports the fact that the former has an ideal Sb─Sb distance for emission.…”