高度稳定的 CsPbBr3 钙钛矿纳米晶体封装在用于白光发光二极管的金属有机骨架中,ACS Applied Nano Materials

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高度稳定的 CsPbBr3 钙钛矿纳米晶体封装在用于白光发光二极管的金属有机骨架中
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-01-19 , DOI: 10.1021/acsanm.2c04758
Zhen-Dong Lian ₁ , Bo Wang ₂ , Zhi-Sheng Wu ₁ , Hao Lin ₁ , Shan-Shan Yan ₁ , Jie-Lei Li ₁ , Kang Zhang ₂ , Qing-Guang Zeng ₂ , Jin-Cheng Xu ₁ , Shi Chen ₁ , Shuang-Peng Wang ₁ , Kar Wei Ng ₁

Affiliation

CsPbX ₃ (X = Cl, Br, I) 钙钛矿纳米晶体 (NC) 在包括宽色域显示和照明在内的众多应用中显示出巨大的潜力。尽管具有出色的发光特性，但这些 NC 固有的不稳定性阻碍了它们在实际情况中的使用。在此，我们报告了一种简便的水基无配体方法，使用金属有机骨架 ZIF-62 作为封装基质，合成高度稳定的 CsPbX _{3 NC，可有效地将 CsPbX}₃与周围环境隔离开来。_{我们发现 ZIF-62 的弱碱性促进了水和 PbBr 2}之间的反应形成 PbBr(OH)，这不仅钝化了 CsPbBr _{3的表面缺陷}NCs还可以防止钙钛矿在高温下分解或氧化。因此，ZIF-62 的烧结可以在～300 °C 的空气中进行，以将钙钛矿完全密封在绝缘基质内，从而产生 CsPbBr ₃/ZIF-62 复合材料对极性溶剂、热、光和环境湿度表现出高稳定性。值得注意的是，该复合材料可以在水中保持其明亮的发光而不会出现明显的降解超过 2 个月。这些复合材料的窄带发射和稳定性导致了具有出色颜色稳定性的白色发光二极管的展示。在 NC 合成过程中不需要有机溶剂，在烧结过程中不需要惰性气体环境，这里提出的策略可以潜在地促进具有成本效益的大规模合成高度稳定的钙钛矿，这在商业应用中显示出巨大的前景。

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Highly Stable CsPbBr3 Perovskite Nanocrystals Encapsulated in Metal–Organic Frameworks for White Light-Emitting Diodes

CsPbX₃ (X = Cl, Br, I) perovskite nanocrystals (NCs) have shown great potential in numerous applications including wide color gamut display and lighting. Despite the wonderful luminescence properties, the inherent instability of these NCs hinders their use in practical situations. Herein, we report a facile aqueous-based, ligand-free method to synthesize highly stable CsPbX₃ NCs using ZIF-62, a metal–organic framework, as an encapsulation matrix which effectively isolates CsPbX₃ from the surrounding. We discovered that the slightly alkaline nature of ZIF-62 facilitates the reaction between water and PbBr₂ to form PbBr(OH), which not only passivates the surface defects of the CsPbBr₃ NCs but also prevents the perovskite from decomposing or oxidizing at high temperature. Sintering of ZIF-62 can therefore be performed in air at ∼300 °C to completely seal the perovskite within the insulating matrix, resulting in CsPbBr₃/ZIF-62 composites exhibiting high stability against polar solvents, heat, light, and ambient humidity. Notably, the composite can maintain its bright luminescence without noticeable degradation in water for more than 2 months. The narrow-band emission and stability of these composites led to the demonstration of white light-emitting diodes with excellent color stability. Without the need for organic solvents during NC synthesis and noble gas ambient during sintering, the strategy proposed here can potentially facilitate the cost-effective, large-scale synthesis of highly stable perovskites which show great promise in commercial applications.

更新日期：2023-01-19

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