Organic light-emitting diodes with improved hole-electron balance by using molecular layers of phthalocyanine to modify the anode surface |
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Authors: | S Wang YQ Liu XB Huang SL Xu JR Gong XH Chen L Yi Y Xu G Yu LJ Wan CL Bai DB Zhu |
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Institution: | (1) Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, 100080 Beijing, P.R. China |
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Abstract: | By using the Langmuir–Blodgett (LB) technique, well-defined molecular layers of 2,9,16-tri(tert-butyl)-23-(10-hydroxydecyloxy)phthalocyanine were fabricated. These LB films have been employed to modify an anode surface of organic light-emitting devices. The insertion of LB films between an indium tin oxide (ITO) and hole-transport layers leads to an increase in device efficiency as a result of an improvement of the balanced carrier injection. An external quantum efficiency of 0.88% and a brightness of 10840 cd/m2 for a device with a structure of ITO/two LB layers/N,N -diphenyl-N,N -bis(3-methylphenyl)-1,1 -biphenyl-4,4 -diamine (TPD)/tris(8-hydroquinolinato)aluminium (Alq3)/Al were obtained, while the external quantum efficiency and brightness for the device without LB layers of ITO/TPD/Alq3/Al were 0.51% and 5744 cd/m2, respectively. PACS 68.47.Pe; 78.60.Fi; 85.60.Jb |
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