Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA.
Science. 2012 Jul 13;337(6091):204-9. doi: 10.1126/science.1223444.
The spin-polarized organic light-emitting diode (spin-OLED) has been a long-sought device within the field of organic spintronics. We designed, fabricated, and studied a spin-OLED with ferromagnetic electrodes that acts as a bipolar organic spin valve (OSV), based on a deuterated derivative of poly(phenylene-vinylene) with small hyperfine interaction. In the double-injection limit, the device shows ~1% spin valve magneto-electroluminescence (MEL) response, which follows the ferromagnetic electrode coercive fields and originates from the bipolar spin-polarized space charge-limited current. In stark contrast to the response properties of homopolar OSV devices, the MEL response in the double-injection device is practically independent of bias voltage, and its temperature dependence follows that of the ferromagnetic electrode magnetization. Our findings provide a pathway for organic displays controlled by external magnetic fields.
具有自旋极化的有机发光二极管（spin-OLED）一直是有机自旋电子学领域长期追求的目标。我们设计、制造并研究了一种具有铁磁电极的自旋-OLED，它作为双极有机自旋阀（OSV），基于具有小超精细相互作用的氘代聚对苯撑乙烯衍生物。在双注入极限下，该器件表现出约 1%的自旋阀磁电致发光（MEL）响应，该响应遵循铁磁电极矫顽场，源于双极自旋极化空间电荷限制电流。与同质 OSV 器件的响应特性形成鲜明对比的是，双注入器件中的 MEL 响应实际上与偏置电压无关，其温度依赖性与铁磁电极磁化的温度依赖性一致。我们的发现为受外部磁场控制的有机显示器提供了一种途径。
