Thickness-modulated optical nonlinearity of colloidal CdSe–CdS core–shell nanoplatelets: large two-photon absorption and self-focusing effects

作者：Wenbin Xiang, Baohua Zhu, Chunzheng Bai, Bing Gu, Changgui Lv, Jiayu Zhang · 发表于：Nanoscale · 年份：2023 · DOI：10.1039/d3nr04532c · 被引用次数：7 · 研究领域：Nonlinear Optical Materials Studies、Quantum Dots Synthesis And Properties、Protein Interaction Studies and Fluorescence Analysis

esu. The trends were further elucidated by analyzing the optical properties of the nanoplatelets, such as absorption, photoluminescence, and quantum yield, and understanding the variations in defect distribution, exciton binding energy, and quantum confinement effects. The results indicated that the appropriate passivation of the CdS shell effectively enhanced the luminescent performance and third-order nonlinearity of the nanoplatelets, while the induced defects and weakened quantum confinement effects due to the continued shell growth resulted in the opposite effect.