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We report the colloidal synthesis of strongly fluorescent CsPbBr3 perovskitenanowires (NWs) with rectangular section and with tuneable width, from 20 nm(exhibiting no quantum confinement, hence emitting in the green) down to around3 nm (in the strong quan-tum-confinement regime, emitting in the blue), byintroducing in the synthesis a short acid (octanoic acid or hexanoic acid)together with alkyl amines (octylamine and oleylamine). Temperatures below 70{\deg}C promoted the formation of monodisperse, few unit cell thick NWs thatwere free from byproducts. The photoluminescence quantum yield of the NWsamples went from 12% for non-confined NWs emitting at 524 nm to a maximum of77% for the 5 nm diameter NWs emitting at 497 nm, down to 30% for the thinnestNWs (diameter ~ 3nm), in the latter sample most likely due to aggregationoccurring in solution.

Colloidal Synthesis of Strongly Fluorescent CsPbBr3 Nanowires with Width Tunable down to the Quantum Confinement Regime