本文選題：深藍色激基復合物　切入點：有機磁效應　出處：《中國科學:技術科學》2017年04期 　論文類型：期刊論文

【摘要】：2013年Jankus等人在Advanced Materials上報道了NPB與TPBi共混的深藍色激基復合物的發(fā)光機理,根據(jù)瞬態(tài)光譜的實驗結果,他們認為器件中室溫下較高的量子效率是由三重態(tài)激子的湮滅(TTA)導致的,而不是由熱輔助引起的三重態(tài)激子T_1向單重態(tài)激子S_1的轉變結果(即反向系間竄越,RISC).最近的研究表明,有機發(fā)光二極管(OLEDs)中的磁效應(magneto-electroluminescence,MEL)可作為研究其發(fā)光機理的有效手段,對TTA和RISC都有靈敏的指紋響應.本文制備了結構相同的OLEDs,測量了器件的MEL曲線,發(fā)現(xiàn)室溫下該器件內部既沒有發(fā)生TTA,也沒有發(fā)生RISC過程,僅在低溫20K且在大電流工作下才能出現(xiàn)TTA過程,采用更低功函數(shù)的陰極、對器件陽極進行臭氧O_3處理、甚至呈量級增大器件的注入電流,以有利于TTA過程的實現(xiàn),但仍未觀察到TTA,器件的磁電導實驗結果及其理論模擬表明,該體系內部可能發(fā)生了三重態(tài)激子與空穴極化子的相互作用T_1(↑↑)+P~+(↓)→S_1(↑↓)+P~+(↑),即TPI(triplet-polaron interaction)過程,本研究對理解NPB與TPBi共混器件的發(fā)光機制有較好的參考價值.
[Abstract]:In 2013, Jankus et al reported on the luminescence mechanism of the dark blue excimer complexes of NPB and TPBi blends at Advanced Materials. Based on the experimental results of transient spectra, they concluded that the higher quantum efficiency at room temperature was caused by the annihilation of excitons in triplet states. Instead of the thermally assisted transformation of triplet excitons T1 to singlet excitons (i.e. reverse intersystem transitions), recent studies have shown that magneto-electroluminescence Mel in organic light-emitting diodes (OLEDs) can be an effective means of studying its luminescence mechanism. In this paper, OLEDs with the same structure have been prepared, and the MEL curves of the devices have been measured. It is found that there are neither TTAs nor RISC processes inside the devices at room temperature. Only at 20 K at low temperature and at high current can the TTA process occur. The cathode with lower power function is used to treat the anode with ozone O _ 3, and even increases the injection current of the device in an order of magnitude, which is beneficial to the realization of the TTA process. However, TTAs have not been observed. The experimental results of magnetoconductance and their theoretical simulations indicate that the interaction between triplet excitons and hole polarons may occur in the system. 鈫戔啈) P ~ (. 鈫，

本文編號：1649595