【摘要】：為研究紅熒烯(5,6,11,12-Tetraphenylnaphthacene,Rubrene)摻雜體系中激子的反應過程,向主體材料Rubrene中摻入了1%的客體材料DBP(Tetraphenyldibenzoperiflanthene),制備了摻雜型Rubrene的有機發光器件.實驗發現,其電致發光磁效應(Magneto-Electroluminescence,MEL)在室溫下呈現出復雜的新特征線型:在外加磁場處于0 27mT范圍內MEL隨磁場的增加先小幅度上升,在27 200mT隨磁場的增加迅速下降,最后200 500mT范圍內再次上升.通過分析可知器件內存在3種激子反應過程:單重態-三重態激子淬滅(Singlet-Triplet Annihilation,STA)、三重態激子湮滅(Triplet-Triplet Annihilation,TTA)和單重態激子分裂(Singlet Fission,STT).可通過改變注入電流的大小調節三者的競爭:大注入電流時,器件主要是STA反應和TTA反應;注入電流逐漸減小的過程中,激子反應從以TTA為主逐漸過渡到以STT為主.同時也可通過改變摻雜層的厚度和摻雜層在器件結構中的位置,對這幾種反應之間的競爭過程產生重要影響:摻雜層厚度越薄,STT越強,而STA和TTA越弱;摻雜位置越靠近陰極,STA和TTA越強,而STT越弱.這些實驗發現不僅可加深對有機發光二級管中激子間相互作用的理解,也為進一步優化器件發光性能提供參考.
[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，

本文編號：2381943