Fine‐Tuning Single‐Source White‐Light Emission from All‐Inorganic Corrugated 2D Antimony‐Halide Perovskite (Advanced Optical Materials 17/2022)

Corrugated 2D antimony-halide perovskites such as Cs3Sb2Cl9 (CSC) are promising candidates for single-source white-light emission due to their ultra-broadband spectra. However, CSC has a serious luminescence quenching phenomenon due to inadequate confinement of excitons. In article number 2200930, Fei Xu, Xiang Wang, Feng Hong and co-workers report the homovalent substitution strategy of Sb by a small amount of rare earth cations in CSC to realize intense ultra-broadband spectra covering the visible light region at room temperature, resulting from self-trapping exciton emission, which could be considered to be attributed to high activation energy, type-I-like “straddling” band alignment, and strong electron–phonon interaction effect.