Melt-Processed One-Dimensional Halide Perovskite White Light Emitters

One-dimensional (1D) perovskites are promising materials for optoelectronic applications due to their unique optical properties. For example, 1D perovskites often emit broadband white light emission due to intrinsic self-trapped excitons. However, the use of environmentally hazardous high boiling point solvents presents a major obstacle to perovskite commercialization and motivates the development of meltable 1D perovskites. Meltable 1D perovskites have a melting temperature (T_m) below their decomposition temperature (T_d), enabling solvent-free fabrication of 1D perovskite thin films. In this talk, we will highlight the connection between the chemical structure and thermodynamic properties of a new family of 1D perovskites with oligoglycol monoammonium cations. These 1D perovskites emit broadband white light and have a T_m below their T_d. By investigating a series of 1D perovskites with different length oligoglycol-based cations, we uncover new design principles for developing meltable 1D perovskites.