<br>对 CsPbBr3@Pb-MOF 复合材料具有出色的防水、抗紫外线和耐热稳定性,Small Methods

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对 CsPbBr3@Pb-MOF 复合材料具有出色的防水、抗紫外线和耐热稳定性
Small Methods ( IF 10.7 ) Pub Date : 2024-04-21 , DOI: 10.1002/smtd.202400241
Chenxu Wang ₁ , Lihe Yan ₁ , Jinhai Si ₁ , Ning Wang ₁ , Ting Li ₁ , Xun Hou ₁

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全无机卤化铅钙钛矿纳米晶（NCs）由于其优异的光致发光（PL）性能而被广泛应用于光电器件中。然而，暴露于水、紫外线或热下的稳定性差极大地限制了它们的实际应用。在此，通过在室温下通过超声加工铅基 MOF （Pb-MOF）、奥弘溴铵（OAmBr）和油酸铯（Cs-OA）溶液的前驱体，合成了具有优异水、紫外线和热稳定性的 CsPbBr₃@Pb-MOF 复合材料。Pb-MOF 不仅可以为 CsPbBr₃ NCs 的原位生长提供铅源，还可以为钙钛矿 NCs 提供保护层。形成的 CsPbBr₃@Pb-MOF 复合材料显示出 67.8% 的相当大的 PL 量子产率（PLQY），并且在水中浸泡 2 个月时可以保持 90% 的初始 PL 强度。此外，通过传统方法合成的 CsPbBr₃ NCs 证明了出色的 PL 对紫外光和热的稳定性作为比较。最后，使用绿色发光的 CsPbBr₃@Pb-MOF 复合材料制造了绿色（发光二极管）LED，并且在水中浸泡 30 天后表现出优异的稳定性，无需封装。本研究提供了一种提高水相稳定性的实用方法，可能为各种光电器件的未来应用铺平道路。

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Exceptional Stability against Water, UV Light, and Heat for CsPbBr3@Pb-MOF Composites

All-inorganic lead halide perovskite nanocrystals (NCs) have been widely applied in optoelectronic devices owing to their excellent photoluminescence (PL) properties. However, poor stability upon exposure to water, UV light or heat strongly limits their practical application. Herein, CsPbBr₃@Pb-MOF composites with exceptional stability against water, UV light, and heat are synthesized by ultrasonic processing the precursors of lead-based MOF (Pb-MOF), oleylammonium bromide (OAmBr) and cesium oleate (Cs-OA) solutions at room temperature. Pb-MOF can not only provide the lead source for the in situ growth of CsPbBr₃ NCs, but also the protective layer of perovskites NCs. The formed CsPbBr₃@Pb-MOF composites show a considerable PL quantum yield (PLQY) of 67.8%, and can maintain 90% of the initial PL intensity when immersed in water for 2 months. In addition, the outstanding PL stability against UV light and heat is demonstrated with CsPbBr₃ NCs synthesized by the conventional method as a comparison. Finally, a green (light-emitting diode) LED is fabricated using green-emitting CsPbBr₃@Pb-MOF composites and exhibits excellent stability without packaging when immersed in water for 30 days. This study provides a practical approach to improve the stability in aqueous phase, which may pave the way for future applications for various optoelectronic devices.

更新日期：2024-04-21

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