Spin Injection into Organic Light-Emitting Devices with Ferromagnetic Cathode and Effects on Their Luminescence Properties
Spin Injection into Organic Light-Emitting Devices with Ferromagnetic Cathode and Effects on Their Luminescence Properties
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DOI：
10.1143/jjap.45.6897
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发表时间：
2006-09
影响因子：
1.5
通讯作者：
E. Shikoh;A. Fujiwara;Y. Ando;T. Miyazaki
中科院分区：
文献类型：
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作者：
E. Shikoh;A. Fujiwara;Y. Ando;T. Miyazaki
我们研究了有机电致发光器件在外加磁场下的发光特性。从具有Fe阴极的器件中观察到圆偏振光，而具有Al阴极的器件没有显示出这种行为。铁阴极器件的圆偏振度随外加磁场的增加而增加，随发射层厚度的增加而减小。这些现象可以用铁磁阴极注入的自旋极化电子的复合来解释。因此，从圆偏振度的厚度依赖性估计在发射层三-（8-羟基喹啉）-铝中的自旋扩散长度小于60 nm。
We investigated the luminescence properties of organic light-emitting devices under an external magnetic field. Circularly polarized light was observed from the devices with an Fe cathode, whereas those with an Al cathode did not show such behavior. The degree of circular polarization on the device with an Fe cathode increased with increasing applied magnetic field and decreased with increasing emissive layer thickness. These phenomena can be well explained in terms of the recombination of spin-polarized electrons injected from a ferromagnetic cathode. Consequently, spin diffusion length in the emissive layer, tris-(8-hydroxyquinolinato)-aluminum was estimated to be less than 60 nm from the thickness dependence of the degree of circular polarization.