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

Abstract

The synthesis and study of three novel compounds comprising Cs+ and metylhydrazinium cations show that mixing of cations is a promising way to develop novel 0D lead halides exhibiting broadband emission.

Phase Transitions and Dynamics in Mixed Three- and Low-Dimensional Lead Halide Perovskites

“…1D structures have various stoichiometries, and they contain chains composed of corner-, edge-, or face-shared PbX 6 octahedra separated by organic cations . 0D structures also have various stoichiometries, for instance, A 4 PbX 6 , and they consist of completely isolated PbX 6 octahedra or lead halide clusters. , In most cases, the isolation is achieved by employment of large organic cations. As discussed by Akkerman and Manna, these types of lead halides, especially 1D and 0D, have little in common with the 3D perovskite structure, and therefore they should not be identified as perovskites .…”

Structural phase transition drives outright photoluminescence quenching and dielectric duple bistable switching

“…1–3 By assembling suitable organic amines and metal halide components, a series of novel OIMHs with optical properties has been designed and synthesized. 4–15 The photophysical properties of these OIMHs typically benefit from their highly distorted metal halide polyhedra. 16 It is worth noting that the emission of self-trapped excitons (STEs) highly correlated with lattice deformation provides inspiration for regulating OIMHs.…”

Revisiting a (001)-oriented layered lead chloride templated by 1,2,4-triazolium: structural phase transitions, lattice dynamics and broadband photoluminescence

“…15,20,21 In some cases excitons can be trapped on transient defects, leading to the emergence of red-shifted and broad bands from these self-trapped excitons (STEs). 15,20–24 Materials exhibiting broadband emission, particularly the white light emission, are highly sought after. This type of PL is especially often observed in the less common (110)-derived compounds due to a greater dielectric confinement and more pronounced octahedral distortion in these corrugated structures.…”

“…The structural PTs observed in many 2D perovskites are of significant interest, as they cause profound implications in the optoelectronic and electric properties of these materials. These PTs are associated with changes in the dynamics of the organic cations and distortion of the inorganic framework, 24–27 necessitating the use of techniques sensitive to lattice dynamics and structural deformation, like dielectric, Raman and IR spectroscopies. 28–31…”