Enabling Efficient Blue-Emissive Circularly Polarized Luminescence by In Situ Crafting of Chiral Quasi-2D Perovskite Nanosheets within Polymer Nanofibers,Advanced Functional Materials

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Enabling Efficient Blue-Emissive Circularly Polarized Luminescence by In Situ Crafting of Chiral Quasi-2D Perovskite Nanosheets within Polymer Nanofibers
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-12-13 , DOI: 10.1002/adfm.202212095
Zhangchuan Wen ₁ , Rong Lu ₁ , Fan Gu ₁ , Kai Zheng ₁ , Lijie Zhang _{1,

2} , Huile Jin _{1,

2} , Yihuang Chen _{1,

2} , Shun Wang _{1,

2} , Shuang Pan _{1,

2}

Affiliation

Chiral perovskite materials have intrigued enormous interests because of their appealing chiroptical properties and tailorable non-centrosymmetric structures. However, it remains challenging to realize high-efficiency blue emissive circularly polarized luminescence (CPL) of intrinsic chiral perovskite nanomaterials at room temperature. Herein, a robust and versatile electrospinning strategy is reported for in situ construction of chiral 2D and quasi-2D perovskite nanosheets (PNSs) protected in polymer hybrid nanofibers. It is found that quasi-2D chiral PNS/polymer possesses inherent chirality and enhanced CPL properties at room temperature compared to 2D counterparts. Notably, CPL emission color of chiral quasi-2D PNS/polymer can be tuned from deep blue to sky blue, and a high luminescence dissymmetry values up to −8.0 × 10⁻³ can be achieved. Different perovskites, polymers, and nanofibrous structures are expanded to explore the universality of polymer protected PNSs. Significantly, compared to spin-coated film, the stabilities of quasi-2D PNS/polymer film are greatly improved due to the effective protection of polymer. The obtained PNS/polymer hybrid nanofiber films can be conveniently implemented for circularly polarized light emitting diode devices. This study may open up a new avenue for the scalable fabrication of chiral perovskite nanomaterials of interest and their applications in the CPL related fields.

中文翻译：

通过在聚合物纳米纤维中原位制作手性准二维钙钛矿纳米片实现高效的蓝色发射圆偏振发光

手性钙钛矿材料因其吸引人的手性光学特性和可定制的非中心对称结构而引起了极大的兴趣。然而，在室温下实现本征手性钙钛矿纳米材料的高效蓝色发射圆偏振发光（CPL）仍然具有挑战性。在此，报道了一种稳健且通用的静电纺丝策略，用于原位构建在聚合物混合纳米纤维中保护的手性二维和准二维钙钛矿纳米片 (PNS)。研究发现，与二维对应物相比，准二维手性 PNS/聚合物在室温下具有固有的手性和增强的 CPL 特性。值得注意的是，手性准二维 PNS/聚合物的 CPL 发射颜色可以从深蓝色调到天蓝色，并且发光不对称值高达 −8.0 × 10可以达到^{-3 。}扩展了不同的钙钛矿、聚合物和纳米纤维结构，以探索聚合物保护的 PNS 的普遍性。值得注意的是，与旋涂膜相比，准二维PNS/聚合物膜的稳定性由于聚合物的有效保护而大大提高。所获得的 PNS/聚合物杂化纳米纤维薄膜可以方便地用于圆偏振发光二极管器件。这项研究可能为可扩展制造感兴趣的手性钙钛矿纳米材料及其在 CPL 相关领域的应用开辟一条新途径。

更新日期：2022-12-13

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