Abstract
The luminescence of dielectric phase transition materials is one important property for technological applications, such as low-energy electron excitation. The combination of dielectric phase transitions and luminescence within organic–inorganic hybrids would lead to a new type of luminescent dielectric phase transition multifunctional material. Here, we report two novel A2BX4 organic–inorganic hybrid complexes [Me3NVinyl]2[MnCl4] 1 and [Me3NVinyl]2[MnBr4] 2, ([Me3NVinyl] = trimethylvinyl ammonium cation). The complexes 1 and 2 were found to undergo continuous reversible phase transitions as well as switch dielectric phase transitions. Strikingly, intensive red luminescence and green luminescence were obtained under UV excitation respectively to reveal potential application of the two complexes in multi-functional materials along with dielectric switches and so on.
Highlights
Intensive red luminescence and green luminescence were obtained under UV excitation respectively to reveal potential application of the two complexes in multifunctional materials along with dielectric switches and so on
In the search for new phase transition materials with excellent dielectric properties, quasi-spherical organic cations are usually selected as the building block for organic–inorganic hybrid complexes because they could trigger ordereddisordered phase transition and exhibit desired properties.[49,50,51]
The construction of molecular compounds with quasispherical organic cations has become a universal method for designing phase transition materials.[52]
Summary
Triggered by external stimuli like temperature, pressure and light, solid-state phase transitions are usually accompanied by dramatic variations in crystal structures and some physical properties, such as the thermal, optical, dielectric, magnetic and even ferroelectric properties.[1,2,3,4,5,6,7,8,9] phase transition materials have recently attracted a great deal of attention owing to their wide applications in data storage, signal processing, switchable dielectric devices and so on.[10,11,12,13,14] Among these promising materials, dielectric materials with luminescence properties are unique, and can be applied to low-energy electron excitation. In the search for new phase transition materials with excellent dielectric properties, quasi-spherical organic cations are usually selected as the building block for organic–inorganic hybrid complexes because they could trigger ordereddisordered phase transition and exhibit desired properties.[49,50,51] The construction of molecular compounds with quasispherical organic cations has become a universal method for designing phase transition materials.[52] Hybrid metal halide perovskite-type complex with general formula of A2BX4 was a good case (A 1⁄4 organic ammonium cation, B 1⁄4 divalent metal, X 1⁄4 halogen) Such hexagonal stacking perovskites involve a large class of complexes (M 1⁄4 Mn, Fe, Co, Ni, Cu, Cr, or V; X 1⁄4 Cl or Br).[53] Among them, the Mn-complexes have been discovered to uoresce brightly due to the existence of the luminous. Their synthesis, structural phase transitions, and photoluminescence properties are described as follows
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