Abstract
The formation of cesium lead halide perovskite nanocrystals are very effortless due to its extremely fast reaction kinetics. Herein, we present simple hot-inject approach and anion exchange reaction to fabricate all inorganic colloidal CsPbX3 perovskite nanocrystals (NCs). The colloidal CsPbX3 NCs with controlling-size exhibit the characteristics of the high luminescent intensity, superior quantum yields (QY, above 69%) and the narrow-band emission tuning, the bandgap energies and emission spectra are readily tunable over the entire visible spectral region of 425–710 nm. Moreover, the third-order nonlinear optical properties of all inorganic colloidal perovskite nanocrystals (CsPbCl3, CsPbBr3, CsPbI3) were measured using the Z-scan technique, indicating excellent third-order optical nonlinearities. Nonlinear optical susceptibilities reaching to 3.78 × 10−11 esu for CsPbBr3 NCs, figure of merit is achieving above 5 for CsPbI3 NCs. These interesting results demonstrate that the as-prepared all inorganic colloidal CsPbX3 perovskite nanocrystals are expected to hold great promise for application on nonlinear optoelectronic devices.
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