Two-dimensional-lattice-confined single-molecule-like aggregates

Nature, Published online: 11 September 2024; doi:10.1038/s41586-024-07925-9

A molecular aggregate formed in a two-dimensional organic–inorganic hybrid perovskite superlattice with a near-equilibrium distance is shown to have a near-unity photoluminescence quantum yield like that of single molecules, despite being in an aggregated state.