Controllable Anion Exchange on Perovskite Nanocrystal Solid-State Thin Films
Controllable Anion Exchange on Perovskite Nanocrystal Solid-State Thin Films
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DOI：
10.1021/acs.jpcc.3c02281
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发表时间：
2023-05
期刊：
影响因子：
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通讯作者：
Congyang Zhang;Chenfeng Ding;Shuai Yuan;L. Ono;Caiyi Zhang;Tianhao Wu;S. Mariotti;Penghui Ji;Tongtong Li;Jiahao Zhang;Y. Qi
中科院分区：
文献类型：
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作者：
Congyang Zhang;Chenfeng Ding;Shuai Yuan;L. Ono;Caiyi Zhang;Tianhao Wu;S. Mariotti;Penghui Ji;Tongtong Li;Jiahao Zhang;Y. Qi
具有可调发光颜色的胶体混合卤化物钙钛矿纳米晶体（NC）在光电应用中具有巨大的潜力。然而，在纯化和薄膜沉积步骤之后，它们的发射颜色和波长经常改变。在这项工作中，为了规避发射偏移问题，我们报告了一种新的方法，通过在钙钛矿NC固态薄膜上的可控阴离子交换过程直接调谐发射波长。具体地，其通过使用氢氟醚作为与有机卤素试剂的化学良性反应介质来实现。我们的研究还表明，苯基膦卤化物试剂相关的水解反应是阴离子交换的主导机制。基于卤素试剂的多样性，我们的阴离子交换法显示了良好的普适性。最后，作为概念的证明，彩色RGB发光二极管（LED）的制造，这表明我们的钙钛矿NC固态薄膜的可控阴离子交换策略的潜力和光电器件应用的兼容性。
Colloidal mixed-halide perovskite nanocrystals (NCs) with a tunable emission color possess great potential for optoelectronic applications. However, their emission color and wavelength often change after purification and thin film deposition steps. In this work, to circumvent the emission shift issue, we report a novel method to directly tune the emission wavelength through a controllable anion exchange process on perovskite NC solid-state thin films. Specifically, it is realized by using hydrofluoroethers as the chemically benign reaction media with an organic halogen reagent. Our study also demonstrates that the phenylphosphonic halide reagent-related hydrolysis reaction is the dominant mechanism of anion exchange. Based on the diversity of the halogen reagent, our anion-exchange approach shows good universality. Finally, as a proof of concept, colorful RGB light-emitting diodes (LEDs) are fabricated, which shows the promising potential of our controllable anion-exchange strategy on perovskite NC solid-state thin films and the compatibility with optoelectronic device applications.