Efficient polarized light-emitting diodes utilizing ultrathin photoaddressable alignment layers

Efficient polarized light-emitting diodes utilizing ultrathin photoaddressable alignment layers
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利用超薄光寻址对准层的高效偏振发光二极管

DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
S. Kostromine
S. Kostromine
中科院分区：
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文献类型：
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作者：
Xiaohui Yang;D. Neher;S. Lucht;H. Nothofer;R. Güntner;U. Scherf;R. Hagen;S. Kostromine

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我们证明了厚度为5 nm的超薄光可寻址聚合物(PAP)层可用于热致液晶聚荧烯的单区排列。在5~30 nm的范围内，吸收和发射的光学各向异性与PAP层厚度无关。另一方面，减小PAP层厚度大大提高了偏振蓝光发光二极管的性能：在PAP层厚度仅为10 nm的情况下，器件在5V时开启，在8V时亮度达到100cd/m2，效率为0.66cd/A。
We demonstrate that an ultrathin photoaddressable polymer (PAP) layer with a thickness as small as 5 nm can be utilized for the monodomain alignment of thermotropic liquid crystalline polyfluorene. The optical anisotropies in absorption and emission are found to be independent of the PAP layer thickness within a range of 5 to 30 nm. On the other hand, decreasing the PAP layer thickness greatly improves the performance of polarized blue light-emitting diodes: With a PAP layer thickness of only 10 nm, the device turns on at 5 V and reaches a brightness of 100 cd/m2 at 8 V with an efficiency of 0.66 cd/A.