Novel transparent Yb-based cathodes for top-emitting organic light emitting devices with high performance |
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| Authors: | GL Ma AG Xu WQ Zhao SK Wu |
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| Institution: | a School of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China
b International Center for Materials Physics, Academia Sinica, Shenyang 110015, China |
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| Abstract: | We have studied three kinds of transparent low-work-function Yb-based cathodes for the top-emitting organic light emitting devices (TEOLEDs) with a structure of ITO/NPB/Alq3/cathodes and compared them with each other. For the Yb/Au cathodes, a series of Yb layers with various thicknesses have been tested and it is found that the Yb layer with a thickness of 4 nm is the optimum one. The Yb:Au (19 nm) and Yb:Ag (19 nm) co-evaporation cathodes possess very high transmittance but relative poor electron injection; whilst the Yb (4 nm)/Au (15 nm) cathode possess a little lower transmittance but much improved electron injection and the TEOLED with this cathode has the highest power efficiency among the TEOLEDs with the three kinds of Yb-based cathodes mentioned above. |
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| Keywords: | 78 60 Fi 78 66 Qn 73 61 Ph 85 60 Jb 73 20 At 72 80 Le 73 40 Lq |
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