Temperature-responsive emission and elastic properties of a new 2D lead halide perovskite

Abstract

Here, the optical and elastic properties of a newly synthesized 2D lead halide perovskite were systematically investigated via a combined theoretical–experimental approach.

Systematic Approach of One-Dimensional Lead Perovskites with Face-Sharing Connectivity to Realize Efficient and Tunable Broadband Light Emission

“…In recent years, low-dimensional inorganic–organic hybrid halide perovskites including two-dimensional (2D) layers, one-dimensional (1D) chains, or isolated zero-dimensional (0D) clusters at the molecular level, have attracted extensive attention for their intrinsic broadband light emissions mainly arising from the self-trapped excitons (STEs) owing to the strong electron–phonon coupling effect in soft crystal lattice. − Especially, substantial corner-shared octahedral 2D perovskites of [Pb n X 3 n +1 ] ( n +1)– have been structurally, spectrally, and theoretically characterized with tailorable structure and chemical composition, wide emissions spanning entire visible spectrum and facile solution-state assembly technique. − These multiple superiorities enable 2D perovskite as a promising structural platform of single-component white-light-emitting materials. − Comparing with the extensive research of structural modification and property optimization toward the typical 2D perovskites, rare 0D and 1D perovskites display white-light-emitting performance to date. − This insufficiency brings new research opportunities designing new types of perovskites to achieve satisfactory luminescence properties, while expanding the structure and research field of hybrid halides.…”

Temperature-Responsive Photoluminescence and Elastic Properties of 1D Lead Halide Perovskites R- and S-(Methylbenzylamine)PbBr3

“…In addition, its E reaches the minimum value ( E min ) of 6.5 GPa along the <011> direction, which could be attributed to the compliant nature of organic cations packing along this orientation. Accordingly, these two values give an elastic anisotropy (A E = E max / E min ) of 5.1, which is relatively larger than that of some 2D MHPs, such as (benzylammonium) 2 PbBr 4 (4.9) [ 45 ] and (4-methoxyphenethyammonium) 2 PbI 4 (3.2) [ 46 ]. Moreover, the extracted 3D and 2D plots of G for S -MBAPbBr 3 are shown in Figure 4 c,d.…”

Dual‐Stimuli‐Responsive Photoluminescence of Enantiomeric Two‐Dimensional Lead Halide Perovskites

“…This temperature-responsive wavelength shift is about three times of that from a similar 2D lead halide iodide (C 9 H 14 ON) 2 PbI 4 (C 9 H 14 ON + = 4-methoxyphenethyammonium). [44] For these 2D lead halide perovskites, their temperature-responsive emissions are attributed to the bandgap changes which are synergistically determined by the competing TE effects and EP interactions. With increasing temperature, the former leads to widened bandgaps due to the expansion of crystal structure while the latter results in an opposite effect because of the enhanced coupling between electrons and lattice vibration.…”

“…The obtained TE value is reminiscent of that from a 2D perovskite (BA) 2 PbI4 (A TE = 0.18 meV K −1 ), and ≈55% of that from another layered perovskite iodide (C 9 H 14 ON) 2 PbI 4 (C 9 H 14 ON + = 4-methoxyphenethyammonium) (A TE = 0.29 meV K −1 ). [44] In addition, the EP value of electric field in the lattice which are both induced by the structural distortions. [17,47,48] For the studied 2D perovskites here, their soft lattices (enabled by the relatively long PbI bonds) are highly deformable in response to thermal stimulus, hence giving rise to strong EP interactions.…”