One-pot synthesis of CsPbBr3/Cs4PbBr6 perovskite composite

Abstract

In current study, a facile one-pot approach was introduced for the preparation of CsPbBr3/Cs4PbBr6 composite. The formation mechanism behind this proposed approach was investigated in detail. As the results shown, the structure observations by XRD and HRTEM suggested the obtained sample, prepared under an optimal condition of (90 ℃, 20 min), was in a miscible phase of CsPbBr3/Cs4PbBr6. The morphology analysis by TEM illustrated the sample monodispersed as a clear cubic shape with an average size of ∼10 nm. The composition examination by EDS revealed a Pb-poor and Br-rich state which was favorable for the Cs4PbBr6 formation. Particularly, the synthesized sample had a narrow line-width of ∼22 nm, a photoluminescence quantum yield of ∼57 %, and a color purity of 88 %. This indicates the obtained sample is a promising candidate in lighting and display field.