Two-dimensional ruddlesden-popper hybrid perovskite quantum dots for optical limiting application

The perovskite-based materials with optical tuning properties are very important for many practical applications such as the solid-state lighting technology, solar cell, and catalysis. In this work, we used the top-down method to prepare the two-dimensional (2D) (CH3(CH2)(3)NH3)(2)(CH3NH3)(n-1)PbnI3n+1(CPI,n = 1, 2) hybrid perovskite quantum dots (QDs), and reported that the 2D CPI QDs featured an emission band covering the ultraviolet (UV) and blue region, with almost all the emission intensity in the UV region. This UV emission spectrum, along with the UV absorption spectrum, means a strong quantum confinement, as revealed by the X-ray photoelectron spectroscopy (XPS). In addition, the nonlinear optical scattering and absorption properties based respectively on the optical and photoacoustic z-scan characterizations were observed in the 2D CPI QDs, the results of which revealed a two-photon absorption coefficient of up to 6.5 x 10(2)cm/GW. This work reveal the potential of 2D CPI QDs in the high optical limiting applications.

Automated summary

This study prepared two-dimensional hybrid perovskite quantum dots with emission bands in the UV and blue regions, showing strong quantum confinement. Nonlinear optical scattering and absorption properties were observed in the 2D CPI QDs, demonstrating a high two-photon absorption coefficient. These findings reveal the potential of 2D CPI QDs in high optical limiting applications.