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)₂MnCl_2.4Br_1.6] (compound 1) and [(BTA)₂MnCl₄] (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. [ABSTRACT FROM AUTHOR]