Kim Aran, Lee Hyemi, Ryu Choonghan, Cho Sung Min, Chae Heeyeop
Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
J Nanosci Nanotechnol. 2010 May;10(5):3326-30. doi: 10.1166/jnn.2010.2283.
In this work, a nanoscale thick organic light emitting MEH-PPV (poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]layer) was realized by gravure printing technology and its roughness was controlled by the solvent printing process. Also, an organic light emitting diode (OLED) was successfully fabricated by the gravure printing of MEH-PPV layers with surface treatments of solvent printing. There is strong demand for high throughput and large area processing technology for the commercialization of OLEDs and the gravure printing process is a good candidate. We applied gravure printing process technology to OLED fabrication in this work. We controlled the thickness of the organic layers by the multi-printing technique. To control the roughness of the MEH-PPV organic layer, solvent printing was proposed in this work with various solvent mixture of chloroform, chlorobenzene and 1,2-dichlorobenzene on the top of the gravure printed MEH-PPV layers and a significant reduction in roughness was achieved. We were able to achieve a 51 nm thick and 3.7 nm rough MEH-PPV layer with the gravure printing process and subsequent solvent printing treatment and an OLED was fabricated using the gravure printed organic layers. An improvement of the brightness and efficiency was observed due to the improved roughness of the organic layers.
在这项工作中，通过凹版印刷技术制备了纳米级厚度的有机发光MEH-PPV（聚[2-甲氧基-5-(2-乙基己氧基)-1,4-亚苯基乙烯基]层），并通过溶剂印刷工艺控制其粗糙度。此外，通过对MEH-PPV层进行凹版印刷并结合溶剂印刷的表面处理，成功制备了有机发光二极管（OLED）。对于OLED商业化而言，对高通量和大面积加工技术有强烈需求，而凹版印刷工艺是一个不错的选择。在这项工作中，我们将凹版印刷工艺技术应用于OLED制造。我们通过多次印刷技术控制有机层的厚度。为了控制MEH-PPV有机层的粗糙度，本文提出在凹版印刷的MEH-PPV层顶部使用氯仿、氯苯和1,2-二氯苯的各种溶剂混合物进行溶剂印刷，粗糙度显著降低。通过凹版印刷工艺及后续溶剂印刷处理，我们得到了厚度为51 nm且粗糙度为3.7 nm的MEH-PPV层，并使用凹版印刷的有机层制造了OLED。由于有机层粗糙度的改善，观察到亮度和效率有所提高。
