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为了研究红荧烯(5,6,11,12-tetraphenylnaphthacene,Rubrene)器件中三重态激子与电荷相互作用的微观过程,制备了基于Rubrene的有机发光二极管,并测量了室温下器件的磁电导(magneto-conductance,MC).实验发现,器件MC曲线的幅值非常小且表现出了奇特的变化:即在0~8 m T的磁场范围内,MC随磁场快速增大;当磁场处于8~100 m T时,MC则表现为下降;但当磁场大于100 m T时,MC则表现为缓慢增加.分析发现,Rubrene器件中除了超精细相互作用外,还有空穴对三重态激子的解离作用和三重态激子对电子的散射作用的共存,且它们都受单重态激子分裂(singlet fission)的影响.利用Lorentzian和non-Lorentzian经验函数可以对MC进行较好拟合,进一步证实了上述观点.三重态激子解离和电子散射共存这一发现不仅有助于对Rubrene器件中电荷与激发态间相互作用机制的认识,在优化器件性能方面也有一定的指导意义.
In order to study the microscopic process of the interaction between triplet exciton and charge in a rubrene device, a rubrene-based organic light-emitting diode was fabricated and the magnetic conductance of the device was measured at room temperature The magneto-conductance (MC) of the device shows that the amplitude of the device’s MC curve is very small and exhibits a peculiar change: in the range of 0 ~ 8 mT, MC increases rapidly with the magnetic field; when the magnetic field is at 8 ~ 100 mT, MC decreased, but when the magnetic field was more than 100 mT, MC showed a slow increase.It was found that in addition to the superfine interaction, Rubrene devices also had hole-pair triplet excitons And the coexistence of triplet excitons on the scattering of electrons, and they are all affected by singlet fission.The MC fitting can be well fitted by the Lorentzian and non-Lorentzian empirical functions , Further confirming the above point.The discovery of triplet exciton dissociation and electron scattering coexistence not only helps to understand the mechanism of the interaction between charge and excited states in Rubrene devices but also has some guiding significance in optimizing device performance.