Effects of H3PO4 on synthesis and luminescence of metal halide perovskites

Abstract

Metal halide perovskites are attractive light-emitting materials due to their excellent optoelectronic properties. However, the traditional preparation methods are mostly complicated. Recently, we introduced a near room temperature synthesis strategy, named H3PO4-assisted precipitation method, which has advantages of thermal- and pressure-free, eco-friendly, as well as short reaction time. Here, we taken Cs2InBr5·H2O as an example to study the impacts of H3PO4 on synthesis and luminescence of metal halide perovskites. Upon adding H3PO4, Cs2InBr5·H2O gives a bright red emission peaked at 630 nm. Various analytic techniques, including X-ray diffraction, FTIR spectra, X-ray photoelectron spectroscopy, Scanning electron microscope, Absorption spectra, and Photoluminescence spectra were employed to investigate the structure and luminescent properties of the prepared Cs2InBr5·H2O perovskites. The results indicate that H3PO4 significantly affects the crystallinity, morphology and STEs emission of Cs2InBr5·H2O. Additionally, various ions doping (such as Sb3+: Cs2InBr5·H2O) and other metal halide microcrystals (such as CsPbBr3 and CsPb2Br5) can also be obtained with the assistance of H3PO4, indicating H3PO4 is a significant additive for synthesizing and enhancing the luminescence of metal halide perovskites.