Optical tunning of high-luminescent iodine-substituted CsPb2(Br0.84I0.16)5 under pressure

Metal halide compounds hold significant interest for optoelectronics, given their substantial potential for solar cells and light-emitting applications. Low-dimensional (0D, 1D, and 2D) metal halide perovskites or perovskite-like compounds exhibit various compositions with soft lattices and modular...

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Bibliographic Details
Published in:Journal of alloys and compounds 2024-12, Vol.1007, p.176319, Article 176319
Main Authors: Araújo, Bruno S., Ferreira, Wellington C., Gómez, Mayra A.P., Medeiros, Fabio E.O., Freire, Paulo T.C., Paschoal, Carlos W.A., Ayala, Alejandro P.
Format: Article
Language:English
Subjects:
Halide Perovskites
High-pressure conditions
Optoelectronic properties
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Summary:Metal halide compounds hold significant interest for optoelectronics, given their substantial potential for solar cells and light-emitting applications. Low-dimensional (0D, 1D, and 2D) metal halide perovskites or perovskite-like compounds exhibit various compositions with soft lattices and modular optical properties. Thus, the finding of new strategies to further improve such properties is a current research challenge. In this scenario, the 2D perovskite-like compound CsPb2Br5 has attracted attention due to its structural stability and favorable optical properties. This study presents the pressure-induced structural phase transitions of the iodine substituted CsPb2(Br0.84I0.16)5. This substitution induces strong green photoluminescence in single crystals at ambient conditions. High-pressure optical and synchrotron X-ray diffraction experiments reveal a tetragonal-tetragonal structural phase transitions around 1 GPa, while the photoluminescence emission is quenched around 2.7 GPa. Additionally, a new high-pressure orthorhombic phase is identified in the iodine-doped compound beyond 4.5 GPa. Further analysis of structural features prove that the pressure dependent photoluminescence behavior is directly related to structural distortions observed upon pressure increase. [Display omitted] •Structural properties of high-luminescent iodine substituted CsPb2(Br0.84I0.16)5 single-crystals.•Superior structural stability under applied pressure.•Pressure-induced phase transitions.•Long-lasting photoluminescent activity under applied pressure.•Key structural features for pressure-dependent optical behavior.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2024.176319