Zinc-methacrylate passivation enables an efficient and stable perovskite nanocrystal-polymer composite for LED applications,Journal of Materials Chemistry C

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Zinc-methacrylate passivation enables an efficient and stable perovskite nanocrystal-polymer composite for LED applications
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-1-18 , DOI: 10.1039/d0tc05425a
Dan Li _{1,

2,

3,

4,

5} , Yixuan Liu _{1,

2,

3,

4,

5} , Shuangshuang Shi _{1,

2,

3,

4,

5} , Yanjun Li _{1,

2,

3,

4,

5} , Chong Geng _{1,

2,

3,

4,

5} , Shu Xu _{1,

2,

3,

4,

5}

Affiliation

Lead halide perovskite nanocrystals (PNCs) are emerging as promising light-conversion materials for light-emitting diode (LED) display applications. However, the practical application of PNCs is hindered by their labile surface and dynamic ionic ligand binding. Here, we report a post-synthetic surface passivation strategy to stabilize the CsPbBr₃ PNCs by zinc methacrylate (ZnMA) and trioctylphosphine oxide (TOPO) co-passivation. Surface analyses reveal that the ZnMA stabilizes the PNCs by replacing the surface ammonium ligands, and TOPO further coordinates to the ZnMA to provide a high photoluminescence quantum yield (PLQY) of the PNCs. Moreover, the ZnMA capping on the PNC surface could participate in the polymerization of MMA to form a crosslinked polymer shell around the PNCs. The resultant PNCs–PMMA film presents a PLQY of 74% and maintains a constant PL intensity under continuous UV irradiation in air, while the PNCs–PMMA film made of classical PNCs quickly degrades. The prepared PNCs–PMMA film was tested as the light down-conversion layer in LED backlighting and presented photostability comparable to classical CdSe/ZnS NCs–PMMA under continuous illumination. This surface passivation strategy avoids the use of ionic ligands for the surface passivation of PNCs in polymer matrices, and we expect related surface chemistry to promote the performance enhancement of diverse PNCs–polymer composites for LEDs and other optoelectronic applications.

中文翻译：

甲基丙烯酸锌钝化可为LED应用提供高效稳定的钙钛矿纳米晶体-聚合物复合材料

卤化钙钛矿铅纳米晶体（PNC）逐渐成为有前途的用于发光二极管（LED）显示应用的光转换材料。但是，PNCs的不稳定表面和动态离子配体结合阻碍了它们的实际应用。在这里，我们报告了合成后的表面钝化策略，以稳定CsPbBr ₃PNC由甲基丙烯酸锌（ZnMA）和三辛基氧化膦（TOPO）共钝化。表面分析表明，ZnMA通过取代表面铵配体来稳定PNC，TOPO进一步与ZnMA配位，以提供PNC的高光致发光量子产率（PLQY）。而且，封在PNC表面上的ZnMA可以参与MMA的聚合反应，从而在PNC周围形成交联的聚合物壳。所得的PNCs-PMMA膜的PLQY为74％，并且在连续的紫外线照射下在空气中保持恒定的PL强度，而由经典PNC制成的PNCs-PMMA膜则迅速降解。制备的PNCs-PMMA膜作为LED背光中的向下转换层进行了测试，在连续照明下具有与经典CdSe / ZnS NCs-PMMA相当的光稳定性。

更新日期：2021-02-03

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