Halide perovskites exhibiting broad band emission have attracted increasing attention since their discovery in 2014 because of their potentiality in lighting applications. Here, we report a new bromoplumbate organic-inorganic perovskite...
Lead free organic-inorganic hybrid perovskites have attracted increasing attention because of their variety of applications such as photovoltaics or lighting. Here, we reported a new iodobismuthate organic-inorganic perovskite (PyrCO 2 H) 2 BiI 5 where PyrCO 2 H + is the 4-carboxy-1-methylpyridinium. In the room temperature orthorhombic phase, the one-dimensional (1D) inorganic framework which consists of cis-connected corner-sharing BiI 6 octahedra, exhibits a sinusoidal deformation along the chain axis, while a regular chain leading to a sub-cell is found in the high temperature phase (T > 390 K). An original structural feature is the relative position of consecutive 1D chains in planes leading to a layered character of this organicinorganic compound. The electrical properties as function frequencies and temperatures have been studied in particular allowing the extraction of R g and further the calculation of σ g = f(T). Interestingly, a change of activation energy is detected at the phase transition temperature (390 K). The higher value of activation energy above 390 K can be attributed to change of the conduction mechanism involving ionic conduction.
The mechanochromic luminescence (MCL) properties of crystallized powders of composites based on the 3D perovskite MAPbBr3 and one layered (2D) halide perovskite (HP) are reported for three 2D HPs selected for their distinct emission properties: (PEA)2PbBr4 (n=1) narrow emission (HE), (EDBE)PbBr4 (m=2) broad emission (LE) and (BA)2PbBr4 (n=1) dual emission (HE and LE). All composites exhibit sensitive MCL due to the activation of the 3D component emission through energy transfer (ET) from multilayered perovskites formed at the interface. While the excitonic HE band is less affected by the mechanical treatment, LE is quenched in crushed composites, suggesting that it rather originates from the crystal edge/surfaces. Full reversibility of the MCL process is obtained only when the multilayered phases formed at the interface are not stable. The emission of composite thin films, where larger 2D/3D interface areas are present, further support the role of the interfaces in the activation of 3D emission.
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