Successive high-temperature phase transitions triggered dielectric switching in a one-dimensional hybrid perovskite with blue emission

Organic-inorganic hybrid perovskite materials have garnered considerable interest due to their potential in optoelectronic applications. Herein, we assemble a novel one-dimensional organic-inorganic hybrid perovskite from the organic cation with trans-configuration, (trans-4-methylcyclohexylammonium)CdCl3 (compound 1), which undergoes successive high-temperature structural phase transitions accompanied by dual switchable dielectric anomalies. The variable-temperature structural analyses indicate that the phase transition from the triclinic P (1) over bar to the monoclinic space group P21/c at 385 K is driven by the swinging motion of half organic cations, while the subsequent transition to the orthorhombic space group Cmcm at 436 K is attributed to the order-disorder transformation of all organic cations. Moreover, compound 1 exhibits semiconducting characteristics and blue light emission with a remarkably long lifetime of 9.94 ns. These findings are poised to inspire the design of novel multifunctional hybrid perovskites with superior performance.