High triplet energy n-type dopants for high efficiency in phosphorescent organic light-emitting diodes

• High triplet energy Li compounds as n-type dopants of phosphorescent device.
• High electron mobility electron transport layer by n-type doping.
• Suppression of triplet exciton quenching by high triplet energy n-type dopant doped electron transport layer.

High triplet energy n-type dopants, lithium 2-(oxazol-2-yl)phenolate (LiOx) and lithium 2-(1-methyl-imidazol-2-yl)phenolate (LiIm), were synthesized as n-type doping materials for phosphorescent organic light-emitting diodes and the effect of the n-type doping materials on the electron mobility and device performances of the phosphorescent organic light-emitting diodes was investigated. The LiOx and LiIm n-type dopants were effective to increase the electron mobility of electron transport materials and improve the quantum efficiency of green and blue phosphorescent organic light-emitting diodes.

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