Skurlov Ivan D, Yin Wenxu, Ismagilov Azat O, Tcypkin Anton N, Hua Haohang, Wang Haibo, Zhang Xiaoyu, Litvin Aleksandr P, Zheng Weitao
Laboratory of Optics of Quantum Nanostructures, ITMO University, 197101 St. Petersburg, Russia.
Key Laboratory of Automobile Materials, College of Materials Science and Engineering, Jilin University, Changchun 130012, China.
Nanomaterials (Basel). 2022 Jan 1;12(1):151. doi: 10.3390/nano12010151.
Metal halide perovskite nanocrystals (NCs) attract much attention for light-emitting applications due to their exceptional optical properties. More recently, perovskite NCs have begun to be considered a promising material for nonlinear optical applications. Numerous strategies have recently been developed to improve the properties of metal halide perovskite NCs. Among them, B-site doping is one of the most promising ways to enhance their brightness and stability. However, there is a lack of study of the influence of B-site doping on the nonlinear optical properties of inorganic perovskite NCs. Here, we demonstrate that Cd doping simultaneously improves both the linear (higher photoluminescence quantum yield, larger exciton binding energy, reduced trap states density, and faster radiative recombination) and nonlinear (higher two- and three-photon absorption cross-sections) optical properties of CsPbBr NCs. Cd doping results in a two-photon absorption cross-section, reaching 2.6 × 10 Goeppert-Mayer (GM), which is among the highest reported for CsPbBr NCs.
金属卤化物钙钛矿纳米晶体（NCs）因其优异的光学性能而在发光应用中备受关注。最近，钙钛矿NCs开始被认为是一种有前途的非线性光学应用材料。最近已经开发出许多策略来改善金属卤化物钙钛矿NCs的性能。其中，B位掺杂是提高其亮度和稳定性最有前途的方法之一。然而，缺乏关于B位掺杂对无机钙钛矿NCs非线性光学性能影响的研究。在此，我们证明Cd掺杂同时改善了CsPbBr NCs的线性（更高的光致发光量子产率、更大的激子结合能、降低的陷阱态密度和更快的辐射复合）和非线性（更高的双光子和三光子吸收截面）光学性能。Cd掺杂导致双光子吸收截面达到2.6×10戈培尔-迈耶（GM），这是CsPbBr NCs报道的最高值之一。
