Abstract
AbstractWe investigate the characteristics of an organic light‐emitting diode with phosphorescent polymer. Two types of double layer diodes based on poly(9‐vinylcarbazole) (PVK) doped with phosphorescent fac tris(2‐phenylpyridine) iridium (III) [Ir(ppy)3]/aluminum (III) bis(2‐methyl‐8‐quinolinato) 4‐phenylphenolate (BAlq) and [PVK doped Ir(ppy)3]/Alq3 have been investigated. It is found that BAlq can serve as an electron transport layer as well as a hole blocking layer. At the optimal dopant concentration, a high efficiency OLED can be obtained. At 2wt% Ir(ppy)3, an effective external quantum efficiency of 10% photons/electron, a low turn‐on voltage of 6V and a luminance power efficiency of 7.3L/W can be achieved.
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