Lead-free halide double perovskites (DPs) have attracted great attention due to their stability, nontoxicity and good photophysical property. In this work, we report a new, small-bandgap CsCuSbCl DP nanocrystals (NCs) with a bandgap of 1.66 eV, which is the smallest bandgap in reported lead-free three-dimensional DP NCs. Density functional theory calculations confirm that CsCuSbCl DP has an indirect bandgap of 1.70 eV, in good agreement with the experimental result. The photophysical property of CsCuSbCl NCs is studied by the combination of femtosecond transient absorption (TA) and nanosecond TA techniques. In addition, the CsCuSbCl NCs exhibit good stability exposed in the air. These results show that these NCs will have great potential to be used as a light-absorbing material for photovoltaic applications.
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