量子点
结晶
钙钛矿(结构)
胶体
钝化
带隙
纳米晶
材料科学
热稳定性
碘
纳米颗粒
相(物质)
发光
化学工程
纳米技术
光电子学
化学
冶金
图层(电子)
有机化学
工程类
作者
Louwen Zhang,Hai Zhou,Yibo Chen,Zhigang Zheng,Lishuai Huang,Qiao Chen,Kailian Dong,Zhongqiang Hu,Weijun Ke,Guojia Fang
标识
DOI:10.1038/s41467-024-45945-1
摘要
Abstract The scalable and low-cost room temperature (RT) synthesis for pure-iodine all-inorganic perovskite colloidal quantum dots (QDs) is a challenge due to the phase transition induced by thermal unequilibrium. Here, we introduce a direct RT strongly confined spontaneous crystallization strategy in a Cs-deficient reaction system without polar solvents for synthesizing stable pure-iodine all-inorganic tin-lead (Sn-Pb) alloyed perovskite colloidal QDs, which exhibit bright yellow luminescence. By tuning the ratio of Cs/Pb precursors, the size confinement effect and optical band gap of the resultant CsSn x Pb 1-x I 3 perovskite QDs can be well controlled. This strongly confined RT approach is universal for wider bandgap bromine- and chlorine-based all-inorganic and iodine-based hybrid perovskite QDs. The alloyed CsSn 0.09 Pb 0.91 I 3 QDs show superior yellow emission properties with prolonged carrier lifetime and significantly increased colloidal stability compared to the pristine CsPbI 3 QDs, which is enabled by strong size confinement, Sn 2+ passivation and enhanced formation energy. These findings provide a RT size-stabilized synthesis pathway to achieve high-performance pure-iodine all-inorganic Sn-Pb mixed perovskite colloidal QDs for optoelectronic applications.
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