光致发光
卤化物
化学
插层(化学)
纳米线
钙钛矿(结构)
量子产额
小角X射线散射
量子点
铯
Crystal(编程语言)
胶体
散射
吸收(声学)
纳米技术
化学工程
光电子学
结晶学
无机化学
材料科学
光学
物理化学
复合材料
荧光
物理
程序设计语言
计算机科学
工程类
作者
Dandan Zhang,Yi Yu,Yehonadav Bekenstein,Andrew Barnabas Wong,A. Paul Alivisatos,Peidong Yang
摘要
Highly uniform single crystal ultrathin CsPbBr3 nanowires (NWs) with diameter of 2.2 ± 0.2 nm and length up to several microns were successfully synthesized and purified using a catalyst-free colloidal synthesis method followed by a stepwise purification strategy. The NWs have bright photoluminescence (PL) with a photoluminescence quantum yield (PLQY) of about 30% after surface treatment. Large blue-shifted UV-vis absorption and PL spectra have been observed due to strong two-dimensional quantum confinement effects. A small angle X-ray scattering (SAXS) pattern shows the periodic packing of the ultrathin NWs along the radial direction, demonstrates the narrow radial distribution of the wires, and emphasizes the deep intercalation of the surfactants. Despite the extreme aspect ratios of the ultrathin NWs, their composition and the resulting optical properties can be readily tuned by an anion-exchange reaction with good morphology preservation. These bright ultrathin NWs may be used as a model system to study strong quantum confinement effects in a one-dimensional halide perovskite system.
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