Kim Aran, Lee Hyemi, Lee Jiyeon, Cho Sung Min, Chae Heeyeop
School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
J Nanosci Nanotechnol. 2011 Jan;11(1):546-9. doi: 10.1166/jnn.2011.3163.
The gravure printed single layer structure and bi-layer structure of MEH-PPV/rubrene organic light emitting diodes (OLEDs) were investigated in this work. Typically, the formation of bi-layers in polymer light emitting diodes (PLEDs) is challenging. The brightness and efficiency polymer light emitting materials were enhanced by the gravure printed bi-layer structure in this work. The layer structure of the OLED devices was glass/ITO/PEDOT:PSS/active layer/LiF/Al. The active layers were made using two different processes-one was a gravure printed single organic layer made of a blended mixture of MEH-PPV and rubrene, and the other was a gravure printed bi-layer of MEH-PPV and rubrene. The gravure printed bi-layer devices exhibited a higher brightness and efficiency than the blended devices. The efficiency of the bi-layer MEH-PPV/rubrene structure was improved by a factor of 1.6 approximately 3.2, and the brightness was improved by a factor of 1.9 approximately 2.0 compared to the blended single layer structure. This work demonstrated that organic bi-layers could be formed using gravure printing technology and the bi-layer structure exhibited a higher efficiency than the blended single layer structure.
在本工作中，对MEH-PPV/红荧烯有机发光二极管（OLED）的凹版印刷单层结构和双层结构进行了研究。通常，在聚合物发光二极管（PLED）中形成双层结构具有挑战性。在本工作中，通过凹版印刷双层结构提高了聚合物发光材料的亮度和效率。OLED器件的层结构为玻璃/ITO/PEDOT:PSS/有源层/LiF/Al。有源层采用两种不同工艺制备——一种是由MEH-PPV和红荧烯的混合混合物制成的凹版印刷单一有机层，另一种是MEH-PPV和红荧烯的凹版印刷双层。凹版印刷双层器件比混合器件表现出更高的亮度和效率。与混合单层结构相比，双层MEH-PPV/红荧烯结构的效率提高了约1.6至3.2倍，亮度提高了约1.9至2.0倍。这项工作表明，使用凹版印刷技术可以形成有机双层结构，并且双层结构比混合单层结构具有更高的效率。
