Organic electroluminescent characteristics of PS:NPB composite hole transporting layer |
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Authors: | Fan SUO Junsheng YU Jing DENG Shuangling LOU Yadong JIANG |
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Affiliation: | State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China |
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Abstract: | Green organic light-emitting devices with a structure of indium-tin-oxide (ITO)/polystyrene (PS):N, N' -bis-(3-naphthyl)-N, N' -biphenyl-( 1,1' -biphenyl)-4,4' -diamine (NPB)/tris-(8-hydroxyquinoline)-aluminum (Alq3)/Mg:Ag were fabricated. A doping system consisting of small-molecular hole transporting material NPB and polymeric matrix PS was applied as a composite hole transporting layer (HTL), and the thin film preparation was simplified via spin-coating technique. By adjusting the component ratio of the doping system, several devices with different concentration proportion of PS:NPB are constructed. The electroluminescent characteristics of the devices were investigated and discussed. This study demonstrated that the difference of doping concentration of NPB has a remarkable impact on the optoelectronic performance of both HTL and the devices. Optimum device performance can be obtained by choosing a suitable concentration proportion of PS:NPB at 1:1. This study contributes to the construction of composite functional layers of organic light-emitting diode (OLED) devices and to the technical modification. |
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Keywords: | organic light-emitting device N N'-bis-(3-naphthyl)-N N'-biphenyl-(1 1'-biphenyl)-4 4'-diamine (NPB) polystyrene composite hole transporting layer device performance |
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