具有极性聚合物改性层的喷墨打印高效定义像素矩阵钙钛矿发光二极管,Advanced Materials Technologies

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具有极性聚合物改性层的喷墨打印高效定义像素矩阵钙钛矿发光二极管
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2022-06-25 , DOI: 10.1002/admt.202200370
Junjie Wang ₁ , Danyang Li ₁ , Yu Luo ₁ , Jian Wang ₁ , Junbiao Peng ₁

Affiliation

用于基于喷墨印刷技术的全彩显示器的钙钛矿发光二极管 (PeLED) 越来越具有吸引力。对于潜在的应用，制造具有确定像素尺寸的高质量钙钛矿薄膜至关重要。关键问题是如何控制钙钛矿油墨与空穴传输层 (HTL) 之间的接触特性。在这项研究中，提出了一种新的策略，即使用聚[(9,9-双(3'-((N,N-二甲基)-N-乙基铵)-丙基)-2,7-芴)- alt - 2,7-(9,9-二辛基芴)]二溴化物(PFN-Br)极性聚合物修饰HTL表面，代替传统的O ₂等离子法。PFN-Br 可以提高 HTL 的表面能，包括 PVK、Poly-TPD、TFB 等，并且由于其极性季铵基团，可以提高钙钛矿油墨在 HTL 上的润湿性。此外，PFN-Br更容易成核，诱导钙钛矿的微小结晶。另一方面，磷酸二苯酯 (DPA) 首先用于混合钙钛矿油墨，以优化钙钛矿薄膜的相分布并消除未配位的 Pb ^{2+ ，这是由 PEA}⁺和 DPA、Pb ²⁺之间的相互作用产生的和 DPA，分别。结果，通过喷墨打印技术实现了峰值外部量子效率超过10%的定义像素矩阵绿色准二维PeLED，这是迄今为止通过喷墨打印技术制造的最高效的矩阵绿色PeLED。

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Inkjet Printing Efficient Defined-Pixel Matrix Perovskite Light-Emitting Diodes with a Polar Polymer Modification Layer

Perovskite light-emitting diodes (PeLEDs) for full-color displays based on inkjet printing technology are increasingly attractive. For potential applications, fabricating high-quality perovskite films with defined-pixel sizes is crucially important. The key issue is how to control the contact properties between the perovskite ink and a hole transport layer (HTL). In this study, a novel strategy is proposed by using the poly[(9,9-bis(3′-((N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] dibromide (PFN-Br) polar polymer to modify the HTL surface, instead of conventional O₂ plasma method. The PFN-Br can enhance the surface energy of HTLs, including PVK, Poly-TPD, TFB, etc., and improve the wettability of perovskite inks on the HTL due to its polar quaternary ammonium groups. Besides, the PFN-Br acts as the easier nucleation to induce a tiny crystallization of perovskites. On the other hand, the diphenyl phosphate liver (DPA) is first used to mix in perovskite inks to optimize the perovskite film phase distribution and the elimination of uncoordinated Pb²⁺, resulting from interactions between PEA⁺ and DPA, Pb²⁺ and DPA, respectively. As a result, a defined-pixel matrix green quasi-2D PeLED with the peak external quantum efficiency over 10% via inkjet printing technique is achieved, which is the most efficient matrix green PeLEDs fabricated by inkjet printing technique so far.

更新日期：2022-06-25

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