Broadband yellow and white emission from large octahedral tilting in (110)-oriented layered perovskites: imidazolium-methylhydrazinium lead halides

Abstract

Hybrid organic-inorganic perovskites (HOIPs) are presently on the cutting edge of contemporary materials chemistry providing excellent and tuneable optoelectronic properties. Here we report the synthesis, crystal structures, linear optical as...

The lattice symmetrization worked, but with a plot twist: effects of methylhydrazinium doping of MAPbI3 on phase transitions, cation dynamics and photoluminescence

“…, 0.27 and 0.33 eV, was obtained for IMMHyPbBr 4 and IMMHyPbCl 4 compounds, in which the relaxation was assigned to movements of the MHy + cation. 46 We suppose, therefore, that the relaxation process seen in the MA 1− x MHy x PbI 3 samples has a different origin than that reported for pure MAPbI 3 , i.e. , it may be related to MHy + movements.…”

Structural diversity in proline-based lead bromide chiral perovskites

“…It was previously reported that the 1D and 2D hybrid perovskites with corrugated inorganic sublattices exhibit efficient broadband light emissions. 71–73 The broadband light emissions mainly arise from distorted excited states and self-trapped excitons originating from strong electron–phonon coupling with the emission linewidth related to the distortion level of the [PbX 6 ] octahedron. 74–77…”

Zero-dimensional mixed-cation hybrid lead halides with broadband emissions

“…They also show that MHy + cations have unusual ability to form lead halides of vast structural diversity and properties, i.e. , 3D (MhyPbX 3 , X = Cl, Br) 6–8 and quasi-2D RP (BA 2 MHy 2 Pb 3 Br 10 , BA + = butylammonium) 58 with MHy + serving as a ‘perovskitizer’ cation, 2D of formula MHy 2 PbX 4 (X = Cl, Br, I) 16,46,47 and the 2D ACI phase (IMMHyPbX 4 , X = Cl, Br, IM = imidazolium) 22 with MHy + as a ‘spacer’ cation and 1D (MHyPbI 3 ) 45 and 0D (this work), in which MHy + cations separate inorganic chains or PbX 6 4− octahedra.…”

“…12 This approach is also an efficient way for tuning photoluminescence (PL) colour as well as inducing polar (ferro- or antiferroelectric) order and second-order NLO properties. 15,18,19,21,22 Although numerous examples of layered lead halide perovskites comprising two cations have been reported, we are not aware of any mixed-cation analogues in the family of 1D and 0D lead halides.…”