Enhancement of Electroluminescence by Low-Temperature Deposition of Organic Thin Solid Films
GU Jian-hua1, XU Min-hua1, XIAO Zhong-dang1, LU Zu-hong1, HUANG Song-yu2
1National Laboratory of Molecular and Bioelectronics, Southeast University, Nanjing 210096
2Department of Physics, East China University of Science and Technologx Shanghai 200237
Enhancement of Electroluminescence by Low-Temperature Deposition of Organic Thin Solid Films
1National Laboratory of Molecular and Bioelectronics, Southeast University, Nanjing 210096
2Department of Physics, East China University of Science and Technologx Shanghai 200237
Abstract： The electrical and light-emitting behaviors of electroluminescent cells, which consist of naphthoylimide (NPL) as emitting layer and poly(3-octylthiophene)(P3OT) doped with poly(N-vinylcarbazoe) (PVK) as hole transport layer sandwiched between indium-tin-oxide(ITO) and aluminum electrode, have been studied. The mixed polymer (P3OT:PVK) layer and the emitting layer were deposited by spin coating and by vacuum deposition respectively. It was found that the visible blue emission could be observed from the cells at low bias voltage. And when the ITO substrate was cooled to near the liquid N2 temperature during the deposition of NPL emitting layer, the brightness of the cell increased. It was confirmed that holes could be easily injected into NPL layer with deposition temperature decreased.
1997, Vol. 14 
