Two-dimensional Cs 3 Sb 2 Br 9 inducing transformation of three-dimensional CsPbBr 3 to nanoplates.

This communication describes an effective morphological control strategy involving introducing two-dimensional (2D) Cs 3 Sb 2 Br 9 to induce a transformation of three-dimensional (3D) CsPbBr 3 to 2D nanoplates (NPLs). By tuning the Sb/Pb ratio, 2D CsPbBr 3 NPLs exhibiting a deep-blue emission centered at a wavelength of 464 nm with an FWHM of 24 nm have been produced. The absence of organic ligands in these high-quality 2D NPLs mitigate the instability issue induced by organic ligand migration and penetration, and these NPLs exhibit 80% of the initial PL intensity after 55 days.