Oxidative Stable Zero-dimensional Materials: The Rb7Bi3-3xSb3xCl16 Family
Bogdan Benin a b, Kyle M. McCall a b, Michael Woerle a, Viktoriia Morad a b, Marcel Aebli a b, Sergii Yakunin a b, Maksym Kovalenko a b
a Laboratory of Inorganic Chemistry, Department of Chemistry & Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg, 1, Zürich, Switzerland
b EMPA - Swiss Federal Laboratories for Materials Science and Technology, Überland Strasse, 129, Dübendorf, Switzerland
Poster, Bogdan Benin, 038
Publication date: 23rd April 2020

Recent progress in photoluminescent (PL) low-dimensional metal-halides has demonstrated that the fully-inorganic, Cs4SnBr6, as well as hybrid organic-inorganic analogues are not only efficient room temperature (RT) emitters, but they are also competitive materials in niche applications such as thermometry and thermography.[1][2] This stems from their highly temperature-sensitive PL lifetimes with thermometric precisions of up to 13 mK.[2]

However, these materials are tin-based and therefore suffer from their tendency to oxidize and form non-luminescent phases. To solve this problem, we demonstrate the fully inorganic zero-dimensional Rb7Sb3Cl16 as an excellent thermometric material with sensitivities on par with that of Cs4SnBr6. Furthermore, we performed density functional theory calculations in combination with substitutional studies utilizing Bi3+ to gain a deeper understanding of the origin of these optical properties in this phase. We attribute the RT PL to edge-shared [Sb2Cl10]4- dimers within this structure and suggest that this structural motif may be an excellent coordination to target for future luminescent pnictogen-halides.

We thank Dr. Yevhen Shynkarenko for PLQY measurements; Dr. Simon Böhme and Dr. Martin Kotyrba for fruitful discussions. This work was financially supported by the European Union through the FP7 (Marie-Skłodowska Curie ITN network PHONSI, H2020-MSCA-ITN-642656) and through Horizon 2020 (ERC Consolidator Grant SCALE-HALO, grant agreement No. [819740]).

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