High-Temperature Ferroelectricity and Photoluminescence in a Hybrid Organic–Inorganic Compound: (3-Pyrrolinium)MnCl₃

Abstract

Coupling of ferroelectricity and optical properties has become an interesting aspect of material research. The switchable spontaneous polarization in ferroelectrics provides an alternative way to manipulate the light-matter interaction. The recent observation of strong photoluminescence emission in ferroelectric hybrid organic-inorganic compounds, (pyrrolidinium)MnX3 (X = Cl or Br), is an attractive approach to high efficiency luminescence with the advantages of ferroelectricity. However, (pyrrolidinium)MnX3 only displays ferroelectricity near or below room temperature, which limits its future applications in optoelectronics and multifunctional devices. Here, we rationally designed and synthesized high-temperature luminescent ferroelectric materials. The new hybrid compound (3-pyrrolinium)MnCl3 has a very high Curie temperature, Tc = 376 K, large spontaneous electronic polarization of 6.2 μC/cm(2), and high fatigue resistance, as well as high emission efficiency of 28%. This finding is a further step to the practical use of ferroelectric luminescence based on organic-inorganic compounds.

Anomalously rotary polarization discovered in homochiral organic ferroelectrics

“…As an even-order nonlinear optical effect, it is only allowed in crystals without inversion symmetry. The measurement of SHG has been a powerful method of testing crystalline materials for the absence of the symmetry centre343536. As shown in Fig.…”

Organic–inorganic metal halide hybrids beyond perovskites

“…This environmentally friendly 1D metal halide hybrid has other features that make them highly attractive for optoelectronic applications, including moisture stability, a long room-temperature PL lifetime, and photoconductive behavior. 1D structures containing transition metal manganese (Mn) have also been studied recently [13,[125][126][127][128]. These Mn-based 1D hybrids were reported to exhibit bright photoluminescence originating from the (t 2g ) 3 (e g ) 2 -(t 2g ) 4 (e g ) 1 electronic transition of Mn 2+ ions with a high quantum yield under UV excitation.…”

Reversible structural phase transition, ferroelectric and switchable dielectric properties of an adduct molecule of hexamethylenetetramine ferrocene carboxylic acid

“…Moreover, the accurate design and construction of a molecular ferroelectric by facile structural modication on an existing metallo-organic molecule system is still a huge challenge. [14][15][16][17][18][19][20] In fact, a number of molecules that oen undergo reversible phase transitions in the vicinity of the Curie temperature do not belong to the category of ferroelectrics, either above or below the phase transition temperatures. This is because a ferroelectric is required to satisfy some specic conditions: (i) their lower symmetrical structures must fall into one of the 10 noncentrosymmetric and polar space groups (1, 2, m, mm2, 3, 3m, 4, 4mm, 6 and 6mm), 21 and (ii) the dipole moments that can generate remnant spontaneous polarization should exist in the ferroelectric structures.…”