论文部分内容阅读
制备了基于小分子tris-(8-hydroxyquinoline)aluminum(III)(Alq3)的有机发光二极管,并在室温下对器件进行大电流老化处理;然后测量了器件的光电性能,以及电致发光磁效应(magneto-electroluminescence,MEL)随老化时间的变化关系.实验结果显示,经老化处理后,器件的发光效率降低、工作电压增大;但器件的MEL随老化时间则表现出先增加、后减小的特点,且其线型保持不变.基于器件光电性能退化的主要机制,分析了器件MEL发生非单调变化的可能原因,即器件中形成了对发光激子有淬灭作用的Alq3阳离子,该阳离子引起发光强度的减弱造成MEL在短时间处理后增加,而阴极/Alq3界面的退化导致发光层中电场的增大则引起器件MEL的减小.这对理解有机发光的退化机制和有机磁效应的形成机制具有较好的促进作用.
The organic light-emitting diodes based on the small molecule tris- (8-hydroxyquinoline) aluminum (III) (Alq3) were prepared and subjected to high current aging treatment at room temperature. Then the photoelectric properties of the device and the electroluminescence magnetic effect (MEL) with aging time.The experimental results show that after the aging treatment, the luminous efficiency of the device decreases and the operating voltage increases; however, the MEL of the device first increases and then decreases with the aging time And its linearity remains the same.According to the main mechanism of degradation of the device’s optoelectronic properties, the possible reason for the non-monotonic change of the device MEL is analyzed, that is, the Alq3 cation which quenches the luminescent exciton is formed in the device, The decrease in the luminescence intensity causes the MEL to increase after a short time and the degradation of the cathode / Alq3 interface causes the increase of the electric field in the luminescent layer, which leads to the decrease of the device MEL.This is helpful for understanding the mechanism of organic luminescence degeneration and the organomagnetism Forming mechanism has a good role in promoting.