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A series of two component phosphorescent organic light-emitting diodes (PHOLEDs) combing the direct hole injection into dopant strategy with a gradient doping profile were demonstrated. The dopant, host, as well as molybdenum oxide (MoO 3 )-modified indium tin oxide (ITO) anode were investigated. It is found that the devices ITO/MoO 3 (0 or 1nm)/fac-tris(2-phenylpyridine)iridium [Ir(ppy)...
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