Co-doping method used to improve the charge transport balance in solution processed OLEDs  

作　　者：HU Jun-tao WANG Peng XIAO Xue HU Sheng XU Kai WANG Xiang-hua 胡俊涛;王鹏;肖学;胡晟;许凯;王向华(National Engineering Lab of Special Display Technology,State Key Lab of Advanced Display Technology,Academy of Opto-Electronic Technology,Hefei University of Technology,Hefei 230009,China;School of Instrument Science and Opto-electronics Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]National Engineering Lab of Special Display Technology,State Key Lab of Advanced Display Technology,Academy of Opto-Electronic Technology,Hefei University of Technology,Hefei 230009,China [2]School of Instrument Science and Opto-electronics Engineering,Hefei University of Technology,Hefei 230009,China

出　　处：《Optoelectronics Letters》2020年第6期423-427,共5页光电子快报（英文版）

基　　金：supported by the National High Technology Research and Development Program of China (No.2012AA011901);the National Program on Key Basic Research Project of China (No.2012CB723406);the National Natural Science Foundation of China (No.51573036);the Fundamental Research Funds for the Central Universities of China (No.JD2016JGPY0007);the Industry-University-Research Cooperation Project of Aviation Industry Corporation of China (No.CXY2013HFGD20)。

摘　　要：In this paper, co-doping method is used to improve the current efficiency of solution-processed organic light-emitting diodes(OLEDs). By changing the ratio of two thermally activated delayed fluorescent(TADF) emitters, we studied the performance of device and its mechanism. A solution processed OLED with a structure of indium tin oxide(ITO, 150 nm)/PEDOT:PSS(30 nm)/CBP:4 Cz IPN-x%:4 Cz PN-y%(30 nm)/TPBi(40 nm)/Li F(1 nm)/Al(100 nm) was fabricated. The current efficiencies of 26.6 cd/A and 26.4 cd/A were achieved by the devices with dopant ratio of 6% 4 Cz IPN:2% 4 Cz PN and 2% 4 Cz IPN:6% 4 Cz PN in emitting material layer(EML), respectively. By investigating the tendency of current density change in devices with different doping ratio, we suggested that the enhancement of the current efficiency should be due to the charge transport balance improvement induced by assist dopant in EML.

关 键 词：PEDOT PSS CBP Co-doping method used to improve the charge transport balance in solution processed OLEDs 

分 类 号：TN383.1[电子电信—物理电子学]