倒置结构白光有机电致发光器件  

Inverted White Light Organic-emitting Diodes

作　　者：张小亮 徐亚楠 陈月花[1] ZHANG Xiao-liang;XU Ya-nan;CHEN Yue-hua(Key Laboratory for Organic Electronics and Information Displays,Nanjing University of Posts&Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学有机电子与信息显示国家重点实验室培育基地,江苏南京210023

出　　处：《发光学报》2020年第11期1397-1402,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(61705112);江苏省自然科学基金(BK20170913);江苏高校优势学科建设工程(YX03001)资助项目。

摘　　要：研究了在倒置白光有机电致发光器件(Organic light-emitting diodes,OLEDs)ITO/ZnO/PEI/EML/TAPC/MoO3/Al中引入Polyethylenimine(PEI)修饰层对器件性能的影响。研究发现,PEI修饰层的引入可以有效降低ZnO电子注入层的功函数,调控器件的电子注入,改善空穴和电子注入平衡,钝化ZnO表面缺陷态,减少激子猝灭。当PEI浓度为1.0 mg/mL时,倒置白光OLED器件性能达到最佳,其亮度和效率分别为11720 cd·m^-2和16.0 cd·A^-1。本研究为后期倒置结构高性能OLED器件的研发奠定了一定的基础。In this paper,polyethylenimine(PEI)was introduced into inverted white light-emitting diodes(IOLEDs)with the structure of ITO/ZnO/PEI/EML/TAPC/MoO 3/Al.The effects of PEI as a surface modification layer on the performance of devices were investigated.It is found that the introduction of PEI can effectively reduce the work function of ZnO electron injection layer and control the electron injection of devices,improving the hole and electron injection balance.At the same time,it can passivate the surface defect states of ZnO and reduce exciton quenching.When the concentration of PEI is 1.0 mg/mL,white IOLEDs possess the optimal performance,with the largest brightness of 11720 cd·m^-2 and efficiency of 16.0 cd·A^-1 respectively.The introduction of PEI modified layer lays a foundation for the further research of inverted OLEDs with high performance.

关 键 词：PEI 界面修饰 溶液法 倒置白光OLED 

分 类 号：TN383.1[电子电信—物理电子学]