Spin injection into organic light-emitting diodes with a ferromagnetic cathode and observation of the luminescence properties
Spin injection into organic light-emitting diodes with a ferromagnetic cathode and observation of the luminescence properties
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DOI：
10.1016/j.jmmm.2006.10.981
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发表时间：
2007-03
影响因子：
2.7
通讯作者：
E. Shikoh;T. Kawai;A. Fujiwara;Y. Ando;T. Miyazaki
中科院分区：
文献类型：
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作者：
E. Shikoh;T. Kawai;A. Fujiwara;Y. Ando;T. Miyazaki
研究了有机电致发光器件在外加磁场作用下的电致发光特性，观察到了自旋极化发光。当外部磁场施加到具有Fe阴极的有机LED时，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。为了证实这种圆偏振光是否确实是自旋注入引起的，研究了Alq 3（tris-（8-hydroxyquinolinato）-aluminum）薄膜在Fe上和Alq 3薄膜在Al上的光致发光（PL）特性。在Alq 3 on Fe薄膜的情况下，EL的圆偏振度远高于PL的圆偏振度。这表明电致发光的圆极化主要是由自旋注入引起的。
Electroluminescence (EL) properties of organic light-emitting diodes (LEDs) under an external magnetic field were investigated for observation of spin-polarized luminescence. When an external magnetic field was applied to organic LEDs with an Fe cathode, circularly polarized light was observed, while devices with an Al cathode did not show such behavior. In order to confirm whether the circularly polarized light was certainly due to spin injection or not, photoluminescence (PL) property of Alq3(tris-(8-hydroxyquinolinato)-aluminum) film on Fe and that of Alq3film on Al under an external magnetic field were investigated. In the case of Alq3on Fe film, the degree of circular polarization from EL was much higher than that from PL. This suggested that circular polarization on EL was mainly due to spin injection.