High-Temperature
Ferroelectricity and Photoluminescence in a Hybrid Organic–Inorganic
Compound: (3-Pyrrolinium)MnCl<sub>3</sub>
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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)MnX<sub>3</sub> (X = Cl or Br), is an attractive approach to high efficiency
luminescence with the advantages of ferroelectricity. However, (pyrrolidinium)MnX<sub>3</sub> 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)MnCl<sub>3</sub> has a very high Curie temperature, <i>T</i><sub>c</sub> = 376 K, large spontaneous electronic polarization of 6.2
μC/cm<sup>2</sup>, 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