Effects of H3PO4 on synthesis and luminescence of metal halide perovskites

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 H 3 PO 4 -assisted precipitation method, which has advantages of thermal- and pressure-free, eco-friendly, as well as short reaction time. Here, we taken Cs 2 InBr 5 ·H 2 O as an example to study the impacts of H 3 PO 4 on synthesis and luminescence of metal halide perovskites . Upon adding H 3 PO 4 , Cs 2 InBr 5 ·H 2 O 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 Cs 2 InBr 5 ·H 2 O perovskites. The results indicate that H 3 PO 4 significantly affects the crystallinity , morphology and STEs emission of Cs 2 InBr 5 ·H 2 O. Additionally, various ions doping (such as Sb 3+ : Cs 2 InBr 5 ·H 2 O) and other metal halide microcrystals (such as CsPbBr 3 and CsPb 2 Br 5 ) can also be obtained with the assistance of H 3 PO 4 , indicating H 3 PO 4 is a significant additive for synthesizing and enhancing the luminescence of metal halide perovskites.