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Interlayer Engineering of Flexible and Large-Area Red Organic-Light-Emitting Diodes Based on an N-Annulated Perylene Diimide Dimer
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2019-12-10 , DOI: 10.1021/acsaelm.9b00688 Mohammad Rahmati 1, 2 , Sergey V. Dayneko 1 , Majid Pahlevani 3 , Gregory C. Welch 1
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2019-12-10 , DOI: 10.1021/acsaelm.9b00688 Mohammad Rahmati 1, 2 , Sergey V. Dayneko 1 , Majid Pahlevani 3 , Gregory C. Welch 1
Affiliation
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Flexible red OLEDs based on a quadruple-layer stack, in between electrodes, with 160 mm2 active area were fabricated in ambient air on PET via slot-die-coating. For the OLED structure PET/ITO/PEDOT:PSS/PVK/PFO:tPDI2N-EH/ZnO/Ag, the ink formulations and coating parameters for each layer were systematically evaluated and optimized. The air-stable red-light-emitting material tPDI2N-EH was successfully utilized as blended homogeneous film with PFO for the emitting layer. The use of an organic hole-transport layer (PVK) and inorganic electron injection layer (ZnO) significantly improved the brightness of the reference device from 4 to 303 cd/m2. Surface analysis using AFM measurements showed that the PVK interlayer reduced the surface roughness of the hole injection layer (PEDOT:PSS) from 0.45 to 0.17 nm, which improved the ability to form uniform emitting layers on top. In addition, the ZnO interlayer decreased surface roughness from 1.26 to 0.85 nm and reduced the turn-on voltage of the device from 5.0 to 2.8 V.
中文翻译：
基于N型Per二酰亚胺二聚体的柔性大面积红色有机发光二极管的层间工程
在环境空气中，通过缝口模头涂布法在电极之间以四层堆叠为基础的柔性红色OLED在电极之间具有160 mm 2的有效面积。对于OLED结构PET / ITO / PEDOT：PSS / PVK / PFO：tPDI 2 N-EH / ZnO / Ag，系统评估和优化了每层的油墨配方和涂层参数。空气稳定的红色发光材料tPDI 2 N-EH已成功地用作具有PFO的混合均匀膜作为发光层。使用有机空穴传输层（PVK）和无机电子注入层（ZnO）可将参考器件的亮度从4 cd / m 2显着提高到303 cd / m 2。。使用AFM测量的表面分析表明，PVK中间层将空穴注入层（PEDOT：PSS）的表面粗糙度从0.45降低至0.17 nm，从而提高了在顶部形成均匀发光层的能力。此外，ZnO中间层将表面粗糙度从1.26 nm降低到0.85 nm，并将器件的开启电压从5.0 V降低到2.8V。
更新日期：2020-01-06
中文翻译：
基于N型Per二酰亚胺二聚体的柔性大面积红色有机发光二极管的层间工程
在环境空气中，通过缝口模头涂布法在电极之间以四层堆叠为基础的柔性红色OLED在电极之间具有160 mm 2的有效面积。对于OLED结构PET / ITO / PEDOT：PSS / PVK / PFO：tPDI 2 N-EH / ZnO / Ag，系统评估和优化了每层的油墨配方和涂层参数。空气稳定的红色发光材料tPDI 2 N-EH已成功地用作具有PFO的混合均匀膜作为发光层。使用有机空穴传输层（PVK）和无机电子注入层（ZnO）可将参考器件的亮度从4 cd / m 2显着提高到303 cd / m 2。。使用AFM测量的表面分析表明，PVK中间层将空穴注入层（PEDOT：PSS）的表面粗糙度从0.45降低至0.17 nm，从而提高了在顶部形成均匀发光层的能力。此外，ZnO中间层将表面粗糙度从1.26 nm降低到0.85 nm，并将器件的开启电压从5.0 V降低到2.8V。
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