本文選題：深藍(lán)色激基復(fù)合物　切入點(diǎn)：有機(jī)磁效應(yīng)　出處：《中國(guó)科學(xué):技術(shù)科學(xué)》2017年04期 　論文類型：期刊論文

【摘要】：2013年Jankus等人在Advanced Materials上報(bào)道了NPB與TPBi共混的深藍(lán)色激基復(fù)合物的發(fā)光機(jī)理,根據(jù)瞬態(tài)光譜的實(shí)驗(yàn)結(jié)果,他們認(rèn)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(dǎo)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(zhuǎn)變結(jié)果(即反向系間竄越,RISC).最近的研究表明,有機(jī)發(fā)光二極管(OLEDs)中的磁效應(yīng)(magneto-electroluminescence,MEL)可作為研究其發(fā)光機(jī)理的有效手段,對(duì)TTA和RISC都有靈敏的指紋響應(yīng).本文制備了結(jié)構(gòu)相同的OLEDs,測(cè)量了器件的MEL曲線,發(fā)現(xiàn)室溫下該器件內(nèi)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(duì)器件陽極進(jìn)行臭氧O_3處理、甚至呈量級(jí)增大器件的注入電流,以有利于TTA過程的實(shí)現(xiàn),但仍未觀察到TTA,器件的磁電導(dǎo)實(shí)驗(yàn)結(jié)果及其理論模擬表明,該體系內(nèi)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(duì)理解NPB與TPBi共混器件的發(fā)光機(jī)制有較好的參考價(jià)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(hào)：1649595