红荧烯掺杂体系中激子反应的竞争行为
发布时间：2018-12-16 06:38
【摘要】：为研究红荧烯(5,6,11,12-Tetraphenylnaphthacene,Rubrene)掺杂体系中激子的反应过程,向主体材料Rubrene中掺入了1%的客体材料DBP(Tetraphenyldibenzoperiflanthene),制备了掺杂型Rubrene的有机发光器件.实验发现,其电致发光磁效应(Magneto-Electroluminescence,MEL)在室温下呈现出复杂的新特征线型:在外加磁场处于0 27mT范围内MEL随磁场的增加先小幅度上升,在27 200mT随磁场的增加迅速下降,最后200 500mT范围内再次上升.通过分析可知器件内存在3种激子反应过程:单重态-三重态激子淬灭(Singlet-Triplet Annihilation,STA)、三重态激子湮灭(Triplet-Triplet Annihilation,TTA)和单重态激子分裂(Singlet Fission,STT).可通过改变注入电流的大小调节三者的竞争:大注入电流时,器件主要是STA反应和TTA反应;注入电流逐渐减小的过程中,激子反应从以TTA为主逐渐过渡到以STT为主.同时也可通过改变掺杂层的厚度和掺杂层在器件结构中的位置,对这几种反应之间的竞争过程产生重要影响:掺杂层厚度越薄,STT越强,而STA和TTA越弱;掺杂位置越靠近阴极,STA和TTA越强,而STT越弱.这些实验发现不仅可加深对有机发光二级管中激子间相互作用的理解,也为进一步优化器件发光性能提供参考.
[Abstract]:In order to study the reaction process of excitons in the red fluorene doped system, 1% of the guest material DBP (Tetraphenyldibenzoperiflanthene), was doped into the host material Rubrene to prepare the doped Rubrene organic luminescent devices. It is found that the electroluminescent magnetic effect (Magneto-Electroluminescence,MEL) exhibits a new complex linear pattern at room temperature. The MEL increases slightly with the increase of the magnetic field in the range of 0 27mT and decreases rapidly with the increase of the magnetic field at 27 鈩，
本文编号：2381943
[Abstract]:In order to study the reaction process of excitons in the red fluorene doped system, 1% of the guest material DBP (Tetraphenyldibenzoperiflanthene), was doped into the host material Rubrene to prepare the doped Rubrene organic luminescent devices. It is found that the electroluminescent magnetic effect (Magneto-Electroluminescence,MEL) exhibits a new complex linear pattern at room temperature. The MEL increases slightly with the increase of the magnetic field in the range of 0 27mT and decreases rapidly with the increase of the magnetic field at 27 鈩，
本文编号：2381943
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