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在常规型有机发光二极管的基础上,通过改变发光层tri-(8-hydroxyquinoline)aluminum(Ⅲ)(Alq3)厚度,研究了激子复合区厚度对有机发光二极管磁效应的影响.测量了器件在不同温度及偏压下电致发光及注入电流在外加磁场作用下的变化,着重研究了低温下的有机磁电导效应和有机磁电致发光效应.实验发现,低温(50K)高磁场(500mT)下,器件表现出随Alq3厚度的减薄,磁电导值由正到负再到正的非单调变化.利用磁场调控的超精细相互作用、磁场抑制的三重态激子-电荷反应以及激子在界面的淬灭效应,对有机磁电导在低温下表现出的现象进行了定性的解释.实验结果表明,通过改变激子复合区的厚度,可以实现对激子浓度的有效调节,进而实现对有机磁电导和磁电致发光效应的调节.该研究进一步丰富了有机磁效应的实验现象,同时提供了一种调控有机磁效应的手段.
The effect of exciton recombination area thickness on the organic light-emitting diode magnetic effect was studied by changing the thickness of the tri- (8-hydroxyquinoline) aluminum (Ⅲ) (Alq3) layer on the basis of the conventional organic light-emitting diode The effects of organic magnetic conductance and organic magnetoelectroluminescence under low temperature (50K) were studied emphatically with the changes of electroluminescence and injection current under the applied magnetic field under different temperatures and bias voltages. , The device exhibits a non-monotonic change of magnetic conductance from positive to negative to positive with thinning of Alq3 thickness.The magnetic field-controlled triplet exciton-charge reaction and exciton interaction And the quenching effect of the interface, the phenomena of organic magnetoconductivity at low temperature are qualitatively explained.The experimental results show that by adjusting the thickness of the exciton recombination zone, the effective adjustment of the exciton concentration can be realized, Magneto-conductivity and Magneto-photoluminescence effect.This study further enriches the experimental phenomena of organic magnetic effect and provides a means of controlling the organic magnetic effect.