Water-Processable Self-Doped Hole-Injection Layer for Large-Area, Air-Processed, Slot-Die-Coated Flexible Organic Light-Emitting Diodes,Chemistry of Materials

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Water-Processable Self-Doped Hole-Injection Layer for Large-Area, Air-Processed, Slot-Die-Coated Flexible Organic Light-Emitting Diodes
Chemistry of Materials ( IF 7.2 ) Pub Date : 2023-11-01 , DOI: 10.1021/acs.chemmater.3c01784
Akpeko Gasonoo ₁ , Catherine Beaumont ₂ , Anderson Hoff ₁ , Chaochen Xu ₃ , Philip Egberts ₃ , Majid Pahlevani ₄ , Mario Leclerc ₂ , Gregory C. Welch ₁

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Hole-injection layers (HILs) play a pivotal role in organic light-emitting diodes (OLEDs) by enabling the efficient injection of positive charge carriers (holes) into the active layer, thus facilitating light emission. This research paper focuses on enhancing the processability and performance of solution-processed HILs in OLEDs by utilizing a water-processable self-doped polymer, P2. The P2 film, deposited via slot-die coating, exhibits exceptional uniformity, high transmittance (85%) across the visible spectrum, and a smooth surface (with a root-mean-square roughness of 1.4 nm) comparable to state-of-the-art poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films. The P2 HIL in a four-layer OLED structure, consisting of a PET/ITO/HIL/hole transport layer (HTL)/emissive layer (EML)/electron transport layer (ETL)/Ag, with poly(9-vinylcarbazole) (PVK) as the HTL, Super Yellow (SY) as the EML, and poly((9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)) (PFN) as the ETL, demonstrates enhanced hole injection and transport properties. Flexible OLEDs incorporating P2 HILs, fabricated and tested under ambient conditions on a large-area (4 × 40 mm) indium–tin oxide (ITO)-coated polyethylene terephthalate (PET) substrate, demonstrate a maximum current efficiency of 1.24 cd/A, surpassing devices with PEDOT:PSS HILs by 82%. Moreover, a significant 50% reduction in turn-on voltage is observed compared with analogous devices using a PEDOT:PSS layer. This work contributes to the advancement of the OLED technology for various commercial optoelectronic applications.

中文翻译：

用于大面积、空气处理、槽模涂层柔性有机发光二极管的可水处理自掺杂空穴注入层

空穴注入层 (HIL) 在有机发光二极管 (OLED) 中发挥着关键作用，它能够将正电荷载流子（空穴）有效注入有源层，从而促进发光。本研究论文的重点是利用可水处理的自掺杂聚合物 P2 来增强 OLED 中溶液处理 HIL 的可加工性和性能。通过狭缝模头涂层沉积的 P2 薄膜表现出卓越的均匀性、整个可见光谱的高透射率 (85%) 以及与现有技术相当的光滑表面（均方根粗糙度为 1.4 nm）。 -聚(3,4-乙撑二氧噻吩):聚(苯乙烯磺酸)(PEDOT:PSS)薄膜。四层OLED结构中的P2 HIL，由PET/ITO/HIL/空穴传输层(HTL)/发射层(EML)/电子传输层(ETL)/Ag组成，具有聚(9-乙烯基咔唑)( PVK) 作为 HTL，超级黄 (SY) 作为 EML，聚((9,9-双(3′-( N , N-二甲基氨基)丙基)-2,7-芴)- alt -2,7 -(9,9-二辛基芴)) (PFN) 作为 ETL，表现出增强的空穴注入和传输性能。包含 P2 HIL 的柔性 OLED 在环境条件下在大面积 (4 × 40 mm) 涂有氧化铟锡 (ITO) 的聚对苯二甲酸乙二醇酯 (PET) 基板上进行制造和测试，显示出最大电流效率为 1.24 cd/A，超过采用 PEDOT:PSS HIL 的设备 82%。此外，与使用 PEDOT:PSS 层的类似器件相比，开启电压显着降低了 50%。这项工作有助于推进 OLED 技术在各种商业光电应用中的发展。

更新日期：2023-11-01

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