Highly Efficient and Low-Voltage Phosphorescent Organic Light-Emitting Diodes Using an Iridium Complex as the Host Material

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Abstract

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Highly efficient, low-voltage OLEDs comprising bis(2-phenylpyridi- nato-N,C2′)iridium(acetylacetonate) ((ppy)2Ir(acac)) as the host and tris(1-phenylisoquinolinolato-C2,N)iridium(III) (Ir(piq)3) as a red phosphorescent guest are fabricated. Reduced driving voltage, increased maximum power efficiency (see figure), and improved durability of the OLEDs are demonstrated.

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