Very thin photoalignment films for liquid crystalline conjugated polymers: Application to polarized light-emitting diodes
Very thin photoalignment films for liquid crystalline conjugated polymers: Application to polarized light-emitting diodes
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DOI：
10.1063/1.2802572
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发表时间：
2007-10
影响因子：
4
通讯作者：
K. Sakamoto;K. Miki;M. Misaki;K. Sakaguchi;M. Chikamatsu;R. Azumi
中科院分区：
文献类型：
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作者：
K. Sakamoto;K. Miki;M. Misaki;K. Sakaguchi;M. Chikamatsu;R. Azumi
在石英衬底上制备了不同膜厚的聚酰亚胺光取向膜，并在其上形成了单轴取向的玻璃态聚（9，9-二辛基芴基-2，7-二基）（PFO）层。PFO层的光致发光偏振比随着聚酰亚胺膜厚度的增加而迅速增加，并且超过1.6nm的厚度，其在λ 11处饱和。该结果表明，1.6 nm厚的光取向聚酰亚胺膜用作PFO的良好取向层。我们成功地制作了偏振发光二极管的偏振比为29，在459 nm和亮度为700 cd scinm 2，通过使用2.8 nm厚的聚酰亚胺光取向层。
Photoaligned polyimide films with different film thicknesses were prepared on quartz substrates, and uniaxially aligned glassy poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) layers were formed on top. The photoluminescence polarization ratio of the PFO layer rapidly increased with increasing polyimide film thickness, and beyond a thickness of 1.6nm, it was saturated at ∼11. This result shows that the 1.6-nm-thick photoaligned polyimide film works as a good alignment layer for PFO. We succeeded in fabricating a polarized light-emitting diode with a polarization ratio of 29 at 459nm and a brightness of 700cd∕m2 by using a 2.8-nm-thick polyimide photoalignment layer.