Isolated [SbCl6]3– Octahedra Are the Only Active Emitters in Rb7Sb3Cl16 Nanocrystals
| Autor: | Ivan Infante, Angela E.M. Melcherts, Sergio Brovelli, L De Trizio, Juliette Zito, Pinchetti, Andrea Pianetti, Liberato Manna, Michele Ghini, Aniruddha Ray, Baowei Zhang |
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| Přispěvatelé: | Zhang, B, Pinchetti, V, Zito, J, Ray, A, Melcherts, A, Ghini, M, Pianetti, A, Infante, I, Brovelli, S, De Trizio, L, Manna, L |
| Rok vydání: | 2021 |
| Předmět: |
perovskite nanocrystals
optical spectroscopy colloidal synthesis DFT Crystallography Fuel Technology Materials science Octahedron Nanocrystal Renewable Energy Sustainability and the Environment Chemistry (miscellaneous) Materials Chemistry Energy Engineering and Power Technology Spectroscopy Colloidal synthesis |
| Zdroj: | ACS Energy Letters. 6:3952-3959 |
| ISSN: | 2380-8195 |
| DOI: | 10.1021/acsenergylett.1c01662 |
| Popis: | We elucidate here the nature of the emissive states in Rb7Sb3Cl16 nanocrystals (NCs) for which we report a synthesis. These NCs have a crystal structure comprising both isolated [SbCl6]3- octahedra and isolated [Sb2Cl10]4- dimers of octahedra. The optical properties of Rb7Sb3Cl16 NCs are compared with those of Sb-doped Rb3InCl6 NCs, the latter containing only isolated [SbCl6]3- octahedra. The remarkably similar behaviors of the two systems indicate that the optical emission in both materials originates from the isolated octahedra. Density functional theory calculations suggest that the [SbCl6]3- octahedra are optically active in emission because the local arrangement of the Rb+ ions around the octahedra limits the elongation of the Sb-Cl bonds upon excitation, helping to confine the self-trapped exciton in them. Conversely, in the [Sb2Cl10]4- dimers the constraining effect of the surrounding Rb+ ions is less marked and the Sb-Cl bonds fully break upon photoexcitation, opening up an efficient nonradiative channel for the self-trapped excitons. |
| Databáze: | OpenAIRE |
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