Improvement of Photoluminescence of Perovskite CH3NH3PbI3 by Adding Additional CH3NH3I during Grinding

The organic-inorganic hybrid perovskite CH 3 NH 3 PbI 3 has been a good candidate for many optoelectronic applications such as light-emitting diodes due to its unique properties. Optimizing the optical properties of the CH 3 NH 3 PbI 3 material to improve the device performance is a hot topic. Herein, a new strategy is proposed to enhance the light emission of CH 3 NH 3 PbI 3 phosphor effectively. By adding the reactant CH 3 NH 3 I powder in an appropriate proportion and simply grinding, the emission intensity of CH 3 NH 3 PbI 3 is greatly improved. The advantages of the proposed method are swiftness, simplicity and reproducibility, and no requirement for a complex organic ligand. The mechanism of this phenomenon is revealed by x-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, photoluminescence, and temperature-dependent photoluminescence. This study offers a unique insight for optimizing the optical properties of halide perovskite materials.