Low-dimensional copper halides have recently received increasing attention, owing to their non-toxicity, low-cost, and efficient broadband emission with large Stokes shift. Herein, we report a novel one-dimensional organic copper halide PEACuI2 (PEA = C6H5CH2CH2NH3+), which exhibits broad green emission originating from self-trapped excitons (STEs) with a peak of 525 nm and large Stokes shifts of 215 nm. The dynamics and multi-body interactions of STEs were investigated using femtosecond transient absorption (fs TA) spectroscopy at different pu...
