纳米棒
钙钛矿(结构)
光致发光
纳米晶
奥斯特瓦尔德成熟
卤化物
材料科学
量子产额
Crystal(编程语言)
吸收(声学)
化学工程
量子点
纳米技术
化学
无机化学
结晶学
光电子学
光学
工程类
程序设计语言
复合材料
物理
荧光
计算机科学
标识
DOI:10.1002/slct.201900142
摘要
Abstract All‐inorganic cesium lead halide (CsPbX 3 ; X=Cl, Br, I) perovskite nanocrystals (NCs) have been appeared as a promising material for various opto‐electronic applications. These perovskite NCs show high absorption co‐efficient, high photoluminescence quantum yield (upto 90%), narrow photoluminescence full width half maxima, color tunable over entire visible range (400‐700 nm) and more stable compared to bulk counterparts. The photo‐physical properties of these NCs strongly depend on the interaction between the outermost atoms and corresponding surface bound organic passivating ligands. Some capping ligands are loosely connected to the perovskite NCs surface and can separate out very easily in presence of polar solvents. Our experimental observations reveal that in present of polar solvents CsPbBr 3 NCs agglomerate among themselves via oriented attachment process and create big crystals by an Ostwald ripening process. While highly concentrated spherical CsPbBr 3 NCs purified with excess acetonitrile, most of the NCs tends to attach and fuse together in (110) crystal plane to form micrometer sized nanorods. As far as I know, this is the first report on formation of micrometer sized 1‐D CsPbBr 3 nanorods from spherical NCs via oriented attachment process at room temperature.
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