Extremely Broad Electroluminescence from a Two-Dimensional Hybrid Perovskite Light-Emitting Diode

A single-source white-light-emitting diode from a white-light-emitting, two-dimensional hybrid perovskite is reported. The device shows an extremely broad white electroluminescence emission (fwhm = 475 nm, centered about 700 nm), almost three times as broad as its photoluminescence (176 nm) with an excellent color rendering index (CRI) of 99.