Organic–Inorganic Hybrid Hexagonal Perovskites (4-Methylpiperidinium)MnX₃ (X = Cl and Br) with High-Temperature Dielectric Phase Transitions and Photoluminescent Properties

Abstract

Significant attention has been dovoted to the organic−inorganic hybrid perovskites in the realm of scientific research arising from their distinctive optical and dielectric properties along with structural tunability, rendering them highly versatile and adaptable materials. Herein, two novel one-dimensional organic−inorganic hybrid perovskites of (4-MPD)MnX 3 (4-MPD = 4-methylpiperidinium, X = Cl (1), X = Br (2)) were synthesized and demonstrated to, respectively, undergo reversible phase transitions at 376 and 368 K, characterized by differential scanning calorimetry and dielectric measurements. It is instresting to note that the replacement of Br by the Cl halogen atom has maintained the crsytal structures but devoted a slight increase in phase transition temperature. Variable-temperature structural analyses signify that the order−disorder change of 4-MPD cations acts as the driving force for such phase transitions from the Pnma to P1̅ space group. In addition, compounds 1 and 2 both emit strong red photoluminescence under UV excitation. The two compounds with high-temperature dielectric switching and photoluminescent properties will offer fresh insights for the design and investigation of novel multifunctional organic−inorganic hybrid perovskites.

Novel One-Dimensional Organic–Inorganic Hybrid Halide Perovskite Material with Coexistence of High Phase Transition Temperature and Corresponding Dielectric Response

“…AMX 3 is the general formula for such perovskite materials, where A generally refers to organic cations; M stands for Mn 2+ /Co 2+ /Ni 2+ /Cu 2+ etc. ; and X denotes Cl – /Br – /I – . Organic–inorganic hybrid perovskite materials combine the advantages of organic and inorganic components at the molecular level.…”

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

“…A notable aspect of organic–inorganic hybrid perovskites is their propensity for structural phase transitions, stemming from the order–disorder transformation and displacive change of organic cations or the distortion of inorganic moieties. 12–16 These transitions can be triggered by external stimuli, such as temperature, pressure, or light irradiation, leading to significant alterations of the electronic, optical, and dielectric properties. 17–20 The controllability and exploitability of these phase transitions present intriguing opportunities for the design of novel devices with enhanced functionality and performance.…”