Alq_3与LiF之间相互作用的研究  

The Interaction between Alq_3 and LiF

作　　者：苏艳梅[1] 侯延冰[1] 陈晓红[1] 章婷[1] 刘育新[1] 

机构地区：[1]北方交通大学光电子技术研究所,信息存储,显示与材料部级开放实验室

出　　处：《发光学报》2002年第1期37-39,共3页Chinese Journal of Luminescence

基　　金：国家自然科学基金资助项目 ( 2 9992 5 30 ;199740 0 2 )

摘　　要：利用共蒸发的方法 ,制备了LiF和Alq3 掺杂比例为 1∶1、1∶5、1∶7、1∶2 0的样品 ,以及纯Alq3 的样品 ,测量其吸收光谱、荧光光谱。发现掺杂比例不同的情况下 ,吸收峰、吸收边、荧光峰都有一定的移动。进而研究了样品中LiF和Alq3Since the first report of organic light emitting devices(OLEDs)in 1987 by C.W.Tang,much interest has been focused on the development of OLEDs for its potential application in full color flat panel display and optical communication. The balance of charge injection is of critical importance if highly efficient and low-voltage operating EL devices are to be realized.But in most OELDs,the injection of hole is much higher than the injection of electron.It was reported that the presence of a thin alkaline metal compound such as Li 2O or LiF layer at an organic/Al interface significantly enhances electron injection.Among all these alkaline metal compounds, LiF gets the best effect.But the reason of this phenomenon is still unclear. In this paper,we studied the interaction between Alq 3 and the alkaline metal compound,LiF.Alq 3 samples with different LiF-doped concentrations on quartz substrate were made by means of co-evaporation.The ratios of LiF to Alq 3 is 1∶1,1∶5,1∶7 and 1∶20.We also made the Alq 3 sample without LiF.In all the samples,the thickness of Alq 3 is the same but the concentration of LiF varies.The absorption spectra and photoluminescence spectra were measured.And we found that with the increase of the LiF concentration,the absorption edge,absorption peak and photoluminescence peak of the samples had shifted to the direction of shorter wavelength. It is believed that there are some electron traps in Alq 3,and the LiF had filled some of the straps.So the absorption edge shifted to shorter wavelength with the increase of the LiF concentration. The shift of absorption peak and photoluminescence peak is believed to the due to the interaction between Alq 3 and LiF.The use of LiF introduced ionic bond into the Alq 3 film,so the distribution of the electronic clound of the quinoline group is changed,which caused the shift of the absorption peak and photoluminescence peak.

关 键 词：Alp3 LIF 相互作用 有机电致发光 共蒸发 掺杂比例 氟化锂 电子传输材料 铝q3 

分 类 号：TN383.1[电子电信—物理电子学] TN104