doi:10.1039/d0tc04394jengTang, Y.Gomez, L.Van Der Laan, M.Timmerman, D.Sebastian, V.Huang, C.C.Gregorkiewicz, T.Schall, P.Room temperature synthesis and characterization of novel lead-free double perovskite nanocrystals with a stable and broadband emissionART-2021-122592Low-dimensional and lead-free halide perovskites are of great interest for their wide application potential for optoelectronic applications. We report on the successful synthesis of novel lead-free colloidal Cs3BiBr6 nanocrystals (NCs) with an ultra-small size of ~1.5-3 nm by a room temperature antisolvent process. From crystallographic characterization we show that it is critical to precisely control the ratio of precursors to obtain the pure 3-1-6 phase. The synthesis process is facile and repeatable and results in Cs3BiBr6 NCs that display stable blue emission around 438 nm with a relatively broad linewidth of 92.1 nm. Low-temperature photoluminescence (PL) measurements displayed a red-shift of bandgap with decreasing temperature, which might be attributed to the thermal expansion of the lattice. In addition, the NCs demonstrate high stability at ambient conditions. This journal is2021http://zaguan.unizar.es/record/9913810.1039/d0tc04394jhttp://zaguan.unizar.es/record/99138oai:zaguan.unizar.es:99138JOURNAL OF MATERIALS CHEMISTRY C 9, 1 (2021), 158-163by-nchttp://creativecommons.org/licenses/by-nc/3.0/es/info:eu-repo/semantics/openAccess