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为了研究Rubrene分子中激发态的能量共振和分子间π-π共轭的特性对有机磁效应的影响,本文制备了基于不同浓度和厚度的Rubrene有机发光器件,并在不同温度下测量了器件的电致发光磁效应(magnetoelectroluminescence,MEL).实验发现,发光层中Rubrene的厚度和浓度均可以对器件中的MEL产生较大的影响,室温下MEL的高场值随Rubrene层厚度的增加而增加,并在30 nm之后逐步趋于饱和;随着Rubrene分子的浓度和测量温度的降低,MEL高场增加的幅度逐渐减小,甚至在低温时出现高场下降.通过对实验曲线进行数值拟合,认为Rubrene分子之间形成的π-π共轭结构有助于双分子相互作用的发生,单重态激子分裂、三重态激子之间的湮没和单一三重态极化子对的系间窜越三种过程在器件中相互竞争导致了所得MEL的变化.本工作有助于加深对有机光电子器件内部机理的认识.
In order to study the effect of excited state energy resonance and intermolecular π-π conjugation on the effect of organic magnetism in Rubrene molecules, Rubrene organic light-emitting devices based on different concentrations and thicknesses were prepared. The results showed that both the thickness and concentration of rubrene in the luminescent layer can have a significant effect on the MEL in the device. The higher field value of MEL at room temperature increases with the increase of the thickness of the Rubrene layer , And gradually became saturated after 30 nm. As the concentration of Rubrene and the decrease of the measurement temperature, the increase range of MEL field decreased gradually, even at low temperature, and the field curves were numerically fitted , It is considered that the π-π conjugate structure formed between Rubrene molecules contributes to the occurrence of bimolecular interactions, singlet exciton splitting, annihilation between triplet excitons and the intersystem between single triplet polaron pairs The three processes of channeling and competing in the device lead to the changes of the resulting MEL. This work helps to deepen the understanding of the internal mechanism of organic optoelectronic devices.