He Huimei, Tang Bing, Ma Ying
State Key Laboratory of material Processing and Die & Mould Technology, School of Material Sciences and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China.
Nanotechnology. 2018 Feb 2;29(5):055601. doi: 10.1088/1361-6528/aa9c08.
Room temperature recrystallization is a simple and convenient method for synthesis of all-inorganic perovskite nanomaterials with excellent luminescent properties. However, the fast crystallization usually brings the colloidal stability and uncontrollable synthesis issues in the formation of all-inorganic perovskite. In the present study, we present a new strategy to prepare the quantum confined CsPbBr nanocrystals with controlled morphology under ambient condition. With the assist of fatty acid-capped precursor, the crystallization and the following growth rate can be retarded. Thanks to the retarded reaction, the morphology can be varied from nanowires to nanoplates and the thickness can be controlled from 5-7 monolayers by simply adjusting the amount of octylammonium cations and oleic acid. The nanoplates exhibit a higher photoluminescence quantum yield than the nanowires possibly due to fewer defects in the nanoplates.
室温重结晶是一种简单便捷的方法，用于合成具有优异发光性能的全无机钙钛矿纳米材料。然而，快速结晶通常会在全无机钙钛矿的形成过程中带来胶体稳定性和合成不可控的问题。在本研究中，我们提出了一种新策略，可在环境条件下制备具有可控形貌的量子限域CsPbBr纳米晶体。在脂肪酸封端的前驱体的辅助下，结晶及随后的生长速率可以减慢。由于反应速率减慢，通过简单地调节辛基铵阳离子和油酸的量，形貌可以从纳米线变为纳米板，并且厚度可以控制在5 - 7个单分子层。纳米板比纳米线表现出更高的光致发光量子产率，这可能是因为纳米板中的缺陷较少。
