Lifetime enhancement of exciplex based organic light-emitting diodes by triplet exciton engineering

다국어 초록 (Multilingual Abstract)

A device approach to improve the device lifetime of exciplex organic light-emitting diodes was studied bymanaging the intermolecular interaction and concentration quenching of exciplexes. The exciplexes weremade up of a p-type material and a bipolar n-type material, in which the ratio of the p-type material wasless than 50% for dispersion in the n-type material to copy the conventional host-dopant type emittinglayer. The exciplexes generated between the p-type material and n-type material were dispersed in the ntypematerial. The device lifetime of the exciplex organic light-emitting diodes was extended by almostfour times through control of the p-type material content by mimicking the host-dopant system. Theanalysis of the lifetime improvement mechanism revealed that suppression of triplet exciton loss bystrong intermolecular interaction and concentration quenching was the major pathway to stabilize theexciplex devices by dispersion. Additionally, the device lifetime of thefluorescence emitter dopedexciplex devices was extended by more than three times. Therefore, the exciplexes with a p-type materialdispersed in the bipolar n-type material were effective to elongate the device lifetime of the exciplexbased organic light-emitting diodes.

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