Dual dielectric-responsive hybrid materials with fluorescent properties

There has been broad exploration of organic-inorganic hybrid perovskite (OIHP) materials in the scientific community because they have shown vigorous vitality and compatibility in the fields of photovoltaics, light-emitting diodes, and intelligent switches. Based on the relationship between structure and property, the internal structure of a material often directly affects its physical and chemical properties, such as electrical and optical performances. OIHPs with one solid-solid phase transition behavior have been widely studied and reported. However, multi-functional OIHPs possessing a two-step dielectric response coupled with photoluminescence properties are rarely reported. Herein, we report two multi-functional hybrid materials, [(BTA) 2 MnCl 2.4 Br 1.6 ] (compound 1 ) and [(BTA) 2 MnCl 4 ] (compound 2 )(BTA = 3-bromopropyltrimethylamonium). Both compounds undergo two sequential structural transitions accompanying remarkably bistable dielectric responses. Moreover, compounds 1 and 2 can emit bright green light under 365 nm with photoluminescence decay lifetimes of 0.153 ms and 0.198 ms, respectively. Notably, the photoluminescence quantum yield of compound 1 is further increased compared with that of compound 2 . These two-step reversible dielectric switching materials with photoluminescence properties will provide a new case and guidance for further research and exploration of multifunctional materials that undergo multi-step dielectric switching in the application of sensors. We report two dual-step reversible dielectric switching materials with photoluminescence properties.