钙钛矿(结构)
纳米晶
X射线光电子能谱
钝化
光化学
材料科学
傅里叶变换红外光谱
辐照
纳米技术
化学工程
化学
有机化学
物理
工程类
核物理学
图层(电子)
作者
Yixuan Liu,Dan Li,Lulu Zhang,Yujuan Chen,Chong Geng,Shuangshuang Shi,Zizhen Zhang,Wengang Bi,Shu Xu
标识
DOI:10.1021/acs.chemmater.9b04558
摘要
Ligands binding to all-inorganic lead halide perovskite nanocrystals (IPNCs) are easy to detach from the surface through proton exchange, causing severe stability issues in practical applications. Here, we have reported an amine- and acid-free approach for the synthesis of CsPbBr3 IPNC with highly improved photochemical stability. The reaction mechanism follows a trioctylphosphine-mediated surface passivation route, which provides a proton-free reaction environment to stabilize the ligand capping on the surface of IPNCs. Nuclear magnetic resonance, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy characterizations reveal that the IPNCs possess a lead-rich surface passivated by carboxylates. The surface capping motif endows IPNCs with comprehensively improved stability against air, water, light, and heat. The IPNCs withstand exposure to ethanol in room light for 30 days and show nearly no fluorescent quenching. More importantly, the IPNCs present high resistance to intense light irradiation. Under continuous irradiation by 10 W/cm2 blue light in open air, the lifetime of the IPNCs reaches over 2000 h, catching up the photostability of CdSe QDs. The white LEDs based on the IPNCs display a wide color gamut of 122% NTSC and luminous efficacy of 71 lm/W.
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