Encapsulation of Perovskite Nanocrystals into Macroscale Polymer Matrices: Enhanced Stability and Polarization,ACS Applied Materials & Interfaces

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Encapsulation of Perovskite Nanocrystals into Macroscale Polymer Matrices: Enhanced Stability and Polarization
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2016-12-19 00:00:00 , DOI: 10.1021/acsami.6b09443
Shilpa N. Raja ₁ , Yehonadav Bekenstein _{1,

2} , Matthew A. Koc ₁ , Stefan Fischer ₁ , Dandan Zhang ₁ , Liwei Lin , Robert O. Ritchie ₁ , Peidong Yang _{1,

2} , A. Paul Alivisatos _{1,

2}

Affiliation

Lead halide perovskites hold promise for photonic devices, due to their superior optoelectronic properties. However, their use is limited by poor stability and toxicity. We demonstrate enhanced water and light stability of high-surface-area colloidal perovskite nanocrystals by encapsulation of colloidal CsPbBr₃ quantum dots into matched hydrophobic macroscale polymeric matrices. This is achieved by mixing the quantum dots with presynthesized high-molecular-weight polymers. We monitor the photoluminescence quantum yield of the perovskite–polymer nanocomposite films under water-soaking for the first time, finding no change even after >4 months of continuous immersion in water. Furthermore, photostability is greatly enhanced in the macroscale polymer-encapsulated nanocrystal perovskites, which sustain >10¹⁰ absorption events per quantum dot prior to photodegradation, a significant threshold for potential device use. Control of the quantum dot shape in these thin-film polymer composite enables color tunability via strong quantum-confinement in nanoplates and significant room temperature polarized emission from perovskite nanowires. Not only does the high-molecular-weight polymer protect the perovskites from the environment but also no escaped lead was detected in water that was in contact with the encapsulated perovskites for months. Our ligand-passivated perovskite-macroscale polymer composites provide a robust platform for diverse photonic applications.

中文翻译：

钙钛矿纳米晶体到大型聚合物基质的封装：增强的稳定性和极化。

卤化钙钛矿具有优异的光电性能，因此有望用于光子器件。但是，它们的使用受到不良稳定性和毒性的限制。我们通过将胶体CsPbBr ₃量子点封装到匹配的疏水性宏观聚合物基质中，证明了高表面积胶体钙钛矿纳米晶体的水和光稳定性得到了增强。这是通过将量子点与预合成的高分子聚合物混合来实现的。我们首次监测了钙钛矿-聚合物纳米复合材料薄膜在水浸泡下的光致发光量子产率，即使连续浸入水中> 4个月也没有发现变化。此外，在大型聚合物封装的纳米晶钙钛矿中，光稳定性大大提高，维持> 10在光降解之前，每个量子点有^10个吸收事件，这是潜在器件使用的重要阈值。这些薄膜聚合物复合材料中量子点形状的控制通过纳米板中强大的量子约束和钙钛矿纳米线的显着室温极化发射，实现了颜色可调性。高分子量聚合物不仅可以保护钙钛矿免受环境影响，而且在与封装的钙钛矿接触数月的水中也未检测到逸出的铅。我们的配体钝化钙钛矿-宏观聚合物复合材料为各种光子应用提供了一个强大的平台。

更新日期：2016-12-19

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