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Cazals, C., Mercier, N., Allain, M., Massuyeau, F. & Gautier, R. (2024) Broad-Band Emission Switch in Room Temperature Stable Hybrid Perovskite Polymorphs. Crystal Growth & Design, 24 1880–1887.
Added by: Richard Baschera (2024-04-16 07:57:02) Last edited by: Richard Baschera (2024-04-16 08:00:10) |
| Type de référence: Article DOI: 10.1021/acs.cgd.3c01489 Numéro d'identification (ISBN etc.): 1528-7483 Clé BibTeX: Cazals2024 Voir tous les détails bibliographiques  |
Catégories: IMN, MIOPS Créateurs: Allain, Cazals, Gautier, Massuyeau, Mercier Collection: Crystal Growth & Design |
Consultations : 3/3
Indice de consultation : 4% Indice de popularité : 1% |
| Liens URLs https://doi.org/10.1021/acs.cgd.3c01489 |
| Résumé |
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Low dimensional halide perovskites exhibiting broad band emission have attracted increasing attention owing to their potentiality in lighting applications. However, the relationships between the structure and luminescence properties remain unclear up to now. Here, we report a bromoplumbate organic–inorganic perovskite (C3aH)2PbBr4 (C3aH+: 3-ammonium propionic acid cation) which exists as two polymorphs at room temperature (RT): the thermodynamically stable α-phase crystallizing in the P21/n monoclinic space group and the metastable β-phase crystallizing in the P21/c monoclinic space group. α-(C3aH)2PbBr4 can be transformed into β-(C3aH)2PbBr4 by heating over 120 °C, while the reversible transformation occurs upon cooling at very low temperature (100 K) or upon a water or acetone atmosphere. Both polymorphs are built from ⟨100⟩ layered perovskites separated by the same C3aH+ cations. No out-of-plane distortion of perovskite layers is observed in both structures; but strong in-plane distortions with regular PbBr6 octahedra are observed in the β-phase, whereas the α-phase exhibits strongly distorted PbBr6 revealing the 6s2 lone pair stereoactivity. Interestingly, β-(C3aH)2PbBr4 exhibits a narrow emission band (blue emission), whereas α-(C3aH)2PbBr4 exhibits both narrow and broad bands (whitish emission). The existence of two perovskite polymorphs with different emission properties at a given temperature not only allows the establishment of structure–property relationships but also demonstrates that α-(C3aH)2PbBr4 can act as a room temperature luminescence switchable material.
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Publisher: American Chemical Society
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