The templating effect of diammonium cations on the structural and optical properties of lead bromide perovskites: a guide to design broad light emitters

Abstract

The role of templating the formation of 2D metal halide perovskites has been investigated by considering the 1,3-phenylenediammonium (1,3-PDA), 1,3-xylylenediamimonium (1,3-XDA), 1,4-phenylenediammonium (1,4-PDA), and 1,4-xylylenediamimonium (1,4-XDA) cations in lead bromide...

One and Two‐Dimensional 1,4‐Xylylenediammonium (pXDA) Lead Halides: Powders and Thin Films

“…On the contrary, if the excitation wavelength is lowered to 355 nm, a relatively strong emission centered at 420 nm is observed, with a non-negligible Stokes shift of ~0.147 eV. This finding is in accordance with the data previously reported for its corresponding powder specimen, [49] suggesting that the emission is size and morphology independent. At variance, the thin film of the 1D phase, (pXDA)Pb 2 I 6 .…”

“…Similar evidence can be found in other analogues [e. g., in the isomeric (C 6 H 10 N 2 )-PbCl 4 phases [59,60] ] and might be attributed to the non-spherical shape of the Pb II ion, due to incipient and underestimated stereochemical activity of the 6 s 2 valence orbital. [61] We also comparatively discuss here the structure of the already known phase (pXDA)PbBr 4 , [49] which crystallizes in the monoclinic space group P2 1 /a, but it is closely related to that of its lighter analogue. Again, the Pb II ion is located at the cell origin and all other atoms lie in general positions.…”

“…[47] In its dicationic form [1,pXDA], also known as 1,4-bis(ammoniumomethyl)benzene, α,α'-diammonium-p-xylene and, as per IUPAC guidelines, [4-(ammoniummethyl)phenyl] methanammonium, has been previously employed for the construction of 2D iodoplumbates [48] and, very recently, also in the preparation of 2D bromoplumbate analogues, to be used as broad light emitters. [49] These species, which are active materials in solar cells and LED devices, [40,50,51] lack a comprehensive structural, thermal and spectroscopic study of the pristine lead-based systems (in both powder and thin-film form). To fill this gap, in this article we report the preparation and complete character-ization of the low-dimensional phases obtained by means of simple synthetic processes in which the pXDA species is mixed with a Pb(II) precursor in concentrated HX acids (X=Cl, Br, I).…”

“…[a] Values in italics from refs [48]. and[49] [b] μ 2 and μ 3 -I, respectively. diffraction (XRPD) and single crystal diffraction (SXD) studies.…”

Sc1−xErxAlO3perovskites: high-pressure synthesis, photoluminescence properties, andin vitrobioimaging

“…They have revolutionized the field of materials science owing to their potential to exhibit multifunctional properties such as magnetism, ferroelectricity, multiferroicity, superconductivity, thermoelectricity, catalysis, luminescence properties and so on. [1][2][3][4][5][6][7][8] Recently, halide perovskites also exhibited fascinating luminescence properties such as while light emission and enhanced lasing performances. [9][10][11][12] Multifarious synthetic approaches such as solid-state synthesis, sol-gel, hydrothermal methods, etc.…”