Optical Property Behaviors of CsPbBr<sub>3</sub> Colloidal Nanoparticles in a Ligand-Assisted Reprecipitation Process
Mingming Chen, Youwen Yuan, Zhaokun Wang, Xuemin Shen, Yuan Liu, Dawei Cao
Abstract
Recently, all-inorganic cesium lead halide perovskite CsPbX3 (X = Cl, Br, and I) colloidal nanoparticles (NPs) have attracted tremendous attention owing to their potential applications in light-emitting devices. A better understanding of optical property behaviors of the colloidal NPs during the growth process is of vital importance toward the controllable synthesis of CsPbX3 with desired luminescence properties. In this work, the optical property behaviors of as-grown CsPbBr3 NPs in the ligand-assisted reprecipitation process have been investigated via in situ photoluminescence (PL) spectroscopy. It showed that the growth parameters including growth temperature and time play important roles in determining the optical properties of the CsPbBr3 NPs. Specifically, the as-grown CsPbBr3 NPs emitted high-energy photons with a broad full width at half-maximum (fwhm) within the early stage of growth, while prolonging the growth duration led to a narrowing of PL spectra and a redshift of photon emission. Meanwhile, such PL emission evolution behaviors can be further modulated by tuning the growth temperature. On this basis, the optimized growth parameters including growth temperature and time for the fabrication of CsPbBr3 NPs with various luminescence properties were finally proposed.