Jian Chen

Hybrid organic-inorganic perovskites with structural transformation have garnered continued interest in recent years for their potential as multifunctional materials in the field of optoelectronics and smart devices. Herein, we report a novel hybrid organic-inorganic halide, [C₅NOH₁₂]₂[Cd_1.5Cl₅(H₂O)] (1). Remarkably, the centrosymmetric compound 1 undergoes a structural transformation to a novel noncentrosymmetric hybrid perovskite [C₅NOH₁₂][CdCl₃] (2) after dehydration. Accompanied by the chemical bond cleavage and reorganization, the zero-dimensional (0D) trinuclear cluster in compound 1 transforms into an intriguing one-dimensional (1D) hexagonal perovskite structure in compound 2, generating multiple optoelectronic switching behaviors. It is worth mentioning that compound 2 demonstrates successive structural phase transitions at 353 and 405 K, resulting in switchable second harmonic generation (SHG) and a dual dielectric response. In addition, compounds 1 and 2 both feature blue-light luminescence, with respective photoluminescence lifetimes of 0.73 and 1.42 ns. This work will offer a pioneering approach and expansive potential for the preparation and development of hybrid organic-inorganic perovskite materials with superior properties.

In this paper, a self powered circuit with composite energy storage for monitoring terminal in distribution network is proposed, which is consist of a rectifier circuit, DC/DC converter and composite energy storage. Firstly, the self powered circuit obtained energy by CT (Current Transformer) from the lines in distribution network. Then, the expected DC voltage was obtained by rectifier circuit and regulated by DC/DC converter. To enhance the power supply reliability, composite energy storage is applied, which is regulated by coordinated control. To verify the effectiveness, a simulation model was built in MATLAB, and the result are satisfactory.