从纳米晶到纳米线：油酸铯对Cs2AgBiBr6形态的控制。

IF 4.7 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Pub Date : 2025-10-01 DOI:10.1021/acs.inorgchem.5c03596

Zhuolu Li,Yi Wu,Zhangwei Guo,Jiaxin Rui,Zhaogang Teng,Song Wang,Kai Pan

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引用次数: 0

摘要

双钙钛矿材料由于其低毒性和高稳定性，是很有前途的无铅替代品。然而，它们较大的间接带隙限制了光学性能。形态学控制提供了有效的增强策略。将油酸铯（Cs-OA）和溴三甲基硅烷（TMS-Br）注入无油酸前体中。存在的OA与油胺（OAm）反应生成油酸油胺（OAmH+·OA-），与OAm协同作用，增强Ag+和Bi3+的溶解度。然后TMS-Br提供溴化物，触发Cs2AgBiBr6纳米团簇的快速成核。在热力学控制下，这些晶体生长成均匀的纳米晶体。随着时间的推移，多个纳米线自组装并融合成一维结构。时间分辨光致发光显示激子寿命延长为19.0 ns，表明缺陷密度低。温度依赖PL证实激子结合能大（61.1 meV），非辐射复合弱，发光势强。纳米线还表现出优异的稳定性，在室温下放置90天后，其发光强度保持在90%以上。

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From Nanocrystals to Nanowires: The Control of Cs2AgBiBr6 Morphology by Cesium Oleate.

Double perovskite materials are promising lead-free alternatives due to their low toxicity and high stability. However, their large indirect bandgap limits optical performance. Morphology control offers an effective enhancement strategy. Here, cesium oleate (Cs-OA) and bromotrimethylsilane (TMS-Br) were injected into an oleic acid-free precursor. The OA present reacts with oleylamine (OAm) to form oleylammonium oleate (OAmH+·OA-), which, synergistically with OAm, enhances Ag+ and Bi3+ solubility. TMS-Br then provides bromide, triggering rapid nucleation of Cs2AgBiBr6 nanoclusters. Under thermodynamic control, these grow into uniform nanocrystals. Over time, multiple nanowires self-assemble and fuse into one-dimensional structures. Time-resolved photoluminescence shows a prolonged exciton lifetime of 19.0 ns, indicating low defect density. Temperature-dependent PL confirms a large exciton binding energy (61.1 meV), weak nonradiative recombination, and strong luminescence potential. The nanowires also exhibit excellent stability, retaining over 90% of their PL intensity after 90 days at room temperature.

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来源期刊

Inorganic Chemistry 化学-无机化学与核化学

CiteScore

7.60

自引率

13.00%

发文量

1960

审稿时长

1.9 months

期刊介绍： Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.