Polarity and Ferromagnetism in Two-Dimensional Hybrid Copper Perovskites with Chlorinated Aromatic Spacers.

Two-dimensional (2D) organic-inorganic hybrid copper halide perovskites have drawn tremendous attention as promising multifunctional materials. Herein, by incorporating -, -, and -chlorine substitutions in the benzylamine structure, we first report the influence of positional isomerism on the crystal structures of chlorobenzylammonium copper(II) chloride perovskites ACuCl. 2D polar ferromagnets (3-ClbaH)CuCl and (4-ClbaH)CuCl (ClbaH = chlorobenzylammonium) are successfully obtained.

Polar Ferromagnet Induced by Fluorine Positioning in Isomeric Layered Copper Halide Perovskites.

We present the influence of positional isomerism on the crystal structure of fluorobenzylammonium copper(II) chloride perovskites ACuCl by incorporating , -, and -fluorine substitution in the benzylamine structure. Two-dimensional (2D) polar ferromagnet (3-FbaH)CuCl (3-FbaH = 3-fluorobenzylammonium) is successfully obtained, which crystallizes in a polar orthorhombic space group 2 at room temperature. In contrast, both (2-FbaH)CuCl (2-FbaH = 2-fluorobenzylammonium) and (4-FbaH)CuCl (4-FbaH = 4-fluorobenzylammonium) crystallize in centrosymmetric space groups 2/ and at room temperature, respectively, displaying significant differences in crystal structures.

Structural Features in Some Layered Hybrid Copper Chloride Perovskites: ACuCl or ACuCl.

We present three new hybrid copper(II) chloride layered perovskites of generic composition ACuCl or ACuCl, which exhibit three distinct structure types. (-PdH)CuCl (-PdH = protonated -phenylenediamine) adopts a Dion-Jacobson (DJ)-like layered perovskite structure type and exhibits a very large axial thermal contraction effect upon heating, as revealed via variable-temperature synchrotron X-ray powder diffraction (SXRD). This can be attributed to the contraction of an interlayer block, via a slight repositioning of the -PdH moiety.

High-performance flexible inverted organic light-emitting diodes by exploiting MoS nanopillar arrays as electron-injecting and light-coupling layers.

Inverted organic light-emitting diodes (IOLEDs) on plastic substrates have great potential application in flexible active-matrix displays. High energy consumption, instability and poor electron injection are key issues limiting the commercialization of flexible IOLEDs. Here, we have systematically investigated the electrooptical properties of molybdenum disulfide (MoS) and applied it in developing highly efficient and stable blue fluorescent IOLEDs.