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JOURNAL OF SOLID STATE CHEMISTRY · 2023 · IF 3.3

Synthesis, structure and optical properties of (H2DMAPA)BiBr5, (H2DMAPA)BiBr2I3, (H2DMAPA)2AgBiBr8 and (H2EP)2AgBiBr8 lead-free perovskites

Jian-Peng Qin,Chun-Yang Pan

The toxicity of lead limits the commercial application of lead-based perovskites . Replacing lead with an environment-friendly metal is an excellent alternative strategy. Bi 3+ is an interesting choice being that it has satisfactory biological security and similar electron configuration to Pb 2+ . Series of hybrid Bi 3+ perovskites, (H 2 DMAPA)BiBr 5 ( 1 ), (H 2 DMAPA)BiBr 2 I 3 ( 2 ), (H 2 DMAPA) 2 AgBiBr 8 ( 3 ) and (H 2 EP) 2 AgBiBr 8 ( 4 ) were successfully prepared in this work. Their band gaps are 2.65, 2.21, 2.58 and 2.33 eV, respectively. The excitation wavelengths of 1 , 2 , 3 and 4 are 440, 355, 365 and 400 nm, and the corresponding PL emission peaks are located at 480, 580, 493 and 467 nm, respectively.

CAS / MDL: 109-55-7 5308-25-8 1304-76-3

研究领域: 材料科学 · 光电 · 化学

✓ 已验证产品关联 DOI 高影响因子

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Nature Communications · 2024 ·Vol. 15 ·期 1 ·1-11 · IF 14.7

Pressure-induced shape and color changes and mechanical-stimulation-driven reverse transition in a one-dimensional hybrid halide

Zhang Die,Fu Boyang,He Weilong,Li Hengtao,Liu Fuyang,Wang Luhong,Liu Haozhe,Zhou Liujiang,Cai Weizhao

Dynamic crystals with directional deformations in response to external stimuli through molecular reconfiguration, are observed predominantly in certain organic crystals and metal complexes. Low-dimensional hybrid halides, resemble these materials due to the presence of strong hydrogen bonds between bulky organic moieties and inorganic units, whereas their dynamic behavior remains largely unexplored. Here we show that a one-dimensional hybrid halide (MV)BiBr 5 (MV = methylviologen) undergoes an isosymmetric phase transition at hydrostatic pressure of 0.20 GPa, accompanied by a remarkable length expansion of 20–30% and red to dark yellow color change. Unexpectedly, the backward transition can be fully reversed by mechanical stimulation rather than decompression. In the high-pressure phase, the coexistence of strong Bi 3+ lone pair stereochemical activity and large reorientations of the planar MV 2+ cations, together with the newly formed CH···Br hydrogen interactions, are the structural features that facilitate microscopic changes and stabilize the metastable high-pressure phase at ambient conditions.

研究领域: 材料科学 · 晶体学 · 固体化学

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Synthesis, structure and optical properties of (H2DMAPA)BiBr5, (H2DMAPA)BiBr2I3, (H2DMAPA)2AgBiBr8 and (H2EP)2AgBiBr8 lead-free perovskites

Pressure-induced shape and color changes and mechanical-stimulation-driven reverse transition in a one-dimensional hybrid halide