摘要
Energy transfer process and direct charge trapping are two main emission mechanisms in phosphorescent organic light-emitting diodes(Ph OLEDs)with host-guest system.Here,to investigate the relationship between luminescence mechanism and performances in host-guest system thoroughly,we demonstrated a green Ph OLED using 1,3-bis(carbazole-9-yl)benzene(m CP)as the host and the phosphorescent dye fac-tris(2-phenylpyridine)iridium(fac-Ir(ppy)3)as the guest,where the dopant concentration was variable.It had achieved maximum current efficiency and external quantum efficiency of 84.71 cd/A and 24.5%at 5 wt%dopant concentration,respectively.The intrinsic emission mechanisms in the system have been discussed in detail.Moreover,by analyzing the constant current electroluminescence(EL)and the transient EL,the main cause of relationship between dopant concentration and luminescence mechanism has been revealed and the origin of the high performance is also unveiled.
作者
XIAO Xue
WU Han
LU Chaochao
ZHANG Genggeng
HU Juntao
肖学;吴涵;陆超超;张庚庚;胡俊涛(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)
基金
supported by the Fundamental Research Funds for the Central Universities of China(No.JD2019JGPY0020)
the National Natural Science Foundation of China(No.51573036)
the Industry-University-Research Cooperation Project of Aviation Industry Corporation of China(No.CXY2013HFGD20)。
