Highly polarized polymer-based light-emitting diodes fabricated by using very thin photoaligned polyimide layers
Highly polarized polymer-based light-emitting diodes fabricated by using very thin photoaligned polyimide layers
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DOI：
10.1063/1.3445774
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发表时间：
2010-06
影响因子：
3.2
通讯作者：
K. Sakamoto;K. Miki;M. Misaki;K. Sakaguchi;Y. Hijikata;M. Chikamatsu;R. Azumi
中科院分区：
文献类型：
--
作者：
K. Sakamoto;K. Miki;M. Misaki;K. Sakaguchi;Y. Hijikata;M. Chikamatsu;R. Azumi
偏振聚合物基发光二极管（PLED）已通过插入一个非常薄的光取向聚酰亚胺薄膜到器件结构制造。光对准的聚酰亚胺膜用于形成发光聚合物聚（9，9-二辛基芴基-2，7-二基）（PFO）的高度取向层。聚酰亚胺的主链结构中含有偶氮苯，使我们能够通过光学处理来控制其主链结构的排列。由于光配向处理是无划痕的，所以光配向膜的厚度可以减小到4 nm以下而不降低其对PFO的配向能力。尽管聚酰亚胺是一种良好的绝缘体，但这种非常薄的光致取向膜可以插入PLED结构中。我们研究了光取向聚酰亚胺薄膜和发光层的厚度对偏振PLED的偏振比和电流效率的影响。使用2.9 nm厚的聚酰亚胺光致取向层和101 nm厚的PFO发光层，我们已经完成了...
Polarized polymer-based light-emitting diodes (PLEDs) have been fabricated by inserting a very thin photoaligned polyimide film into the device structure. The photoaligned polyimide film was used to form a highly oriented layer of light-emitting polymer, poly (9,9-dioctylfluorenyl-2,7-diyl) (PFO). The polyimide contains azobenzene in the backbone structure, allowing us to control the alignment of its backbone structure by optical treatment. Since the photoalignment treatment is scratch-free, the thickness of the photoaligned film can be reduced below 4 nm without decreasing its alignment ability for PFO. Even though polyimide is a good insulator, such a very thin photoaligned film can be inserted into PLED structures. We examined the influence of the thickness of the photoaligned polyimide film and the light-emitting layer on the polarization ratio and the current efficiency of the polarized PLEDs. Using a 2.9 nm-thick polyimide photoalignment layer and a 101 nm-thick PFO light-emitting layer, we have suc...