Jia Weiyao, Ikoma Tadaaki, Chen Lixiang, Zhu Hongqiang, Tang Xiantong, Qu Fenlan, Xiong Zuhong
School of Physical Science and Technology, Southwest University Chongqing 400715 People's Republic of China
MOE Key Laboratory on Luminescence and Real-Time Analysis, Southwest University Chongqing 400715 People's Republic of China.
RSC Adv. 2019 May 21;9(28):15845-15851. doi: 10.1039/c9ra01501a. eCollection 2019 May 20.
The spin polarization and spin-orbit coupling (SOC) in polymer light emitting diodes (PLEDs) with the active layer doped with FeO nanoparticles (NPs) were identified through magneto-electroluminescence (MEL). By comparing the MEL characteristics such as linewidth and magnitude between PLEDs with and without FeO dopant, we confirmed the existence of spin polarization, but ruled out the existence of SOC. Although the spin polarization is positive to electroluminescence, the brightness-current characteristics suggested that the current efficiency of the doped PLED does not improve. We attributed it to the current leakage caused by the FeO NPs in the active layer. This work is beneficial for us to further understand the effect of magnetic nanoparticle doping on the dynamic behavior of excitons and polaron pairs in organic semiconductor devices.
通过磁电致发光（MEL）确定了有源层掺杂有FeO纳米颗粒（NPs）的聚合物发光二极管（PLED）中的自旋极化和自旋轨道耦合（SOC）。通过比较有和没有FeO掺杂剂的PLED之间的MEL特性，如线宽和幅度，我们证实了自旋极化的存在，但排除了SOC的存在。尽管自旋极化对电致发光有积极作用，但亮度-电流特性表明掺杂PLED的电流效率并未提高。我们将其归因于有源层中FeO NPs引起的电流泄漏。这项工作有助于我们进一步了解磁性纳米颗粒掺杂对有机半导体器件中激子和极化子对动态行为的影响。
