Figure 2.

Overview of studies describing the embedment of CsPbBr₃ in Cs₄PbBr₆. (a) Cs₄PbBr₆ thin films exhibiting appreciable absorption at around 520 nm, (b) accompanied by narrow PL at 550 nm originating from the presence of CsPbBr₃. Adapted from ref (6). (c) Schematic representation of a band structure and absorption/PL spectrum of CsPbBr₃ NCs embedded in a Cs₄PbBr₆ matrix. The absorption spectrum exhibits strong excitonic absorption at around 315 nm due to the Cs₄PbBr₆ host and broad absorption up to 515 nm due to the absorption of the CsPbBr₃ NCs, which emit at the band edge (around 515 nm). (d) Theoretical model for a Cs₄PbBr₆|CsPbBr₃ composite material, with various embedded cubic CsPbBr₃ NCs in a rhombic Cs₄PbBr₆ prism matrix, adapted from ref (62). (e) TEM image and electron diffractogram of a Cs₄PbBr₆|CsPbBr₃ composite, indicating the existence of small CsPbBr₃ NCs in the Cs₄PbBr₆ host, adapted from ref (30).