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有机电致发光器件的磁电导效应,是指在恒定外加偏压下,对于不含有任何磁性材料功能层的有机电致发光器件,通过器件的电流发生变化的现象。由于器件对外磁场很敏感,通过给器件施加偏压,如果有外磁场的存在,器件的电流会有较显著地改变,通过与事先测定好的B-I特性曲线对比,便能测定外加磁场的大小。因此利用这种效应可以制成磁场传感器等新型实用器件。有机电致发光器件中存在复杂的激发态及自旋弛豫过程,充分了解这些复杂的物理机制有助于开发更加高效的器件,而磁场会对以上物理过程产生作用,因此是一种很好的研究有机电致发光机制的工具。故这种研究具有较大的科学价值和社会应用前景。文中将从有机电致发光器件磁电导效应的研究背景、发展现状及存在问题等几个方面做详细的论述,并探讨磁电导效应产生的可能微观机制,并对未来的研究方向做进一步的展望。
The magneto-conductance effect of an organic electroluminescent device refers to a phenomenon that a current through a device changes under a constant bias voltage with respect to an organic electroluminescent device that does not contain any functional layer of a magnetic material. Because the device is sensitive to the external magnetic field, the applied current is biased by applying a bias voltage. If there is an external magnetic field, the device current will change significantly. By comparing with the pre-determined B-I characteristic curve, the applied magnetic field can be measured. Therefore, the use of this effect can be made of magnetic field sensors and other new practical devices. There are complex excited states and spin relaxation processes in organic electroluminescent devices. It is a good idea to fully understand these complicated physical mechanisms to help develop more efficient devices that will have an effect on these physical processes. A tool to study organic electroluminescence mechanisms. Therefore, this research has great scientific value and social application prospects. In this paper, we will discuss in detail the research background, development status and existing problems of the magneto-conductivity effect of organic electroluminescent devices, discuss the possible micro-mechanism of magneto-conductance effect, and make a further prospect for the future research direction .