Extended Data Fig. 1: Emission properties and formation mechanism of mixture perovskites.
From: Perovskite light-emitting diodes with external quantum efficiency exceeding 20 per cent
a, Photoluminescence spectra of single-layered CsPbBr3, bilayered CsPbBr3/MABr, and quasi-core/shell-structured mixture-1.0 films. b, Photoluminescence spectra of various mixture perovskite films with different amounts of MABr. The numbers in the key indicate the molar ratio of MABr to CsPbBr3. c, Photograph of mixture perovskite films under ultraviolet light. d, The formation process of the CsPbBr3/MABr quasi-core/shell structure. The yellow areas in the left panel denote the precursor solution.
