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Lifetime improvement of green phosphorescent organic light-emitting diodes by charge confining device structure

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3 Author(s)
Kim, Sung Hyun ; School of Chemical and Biological Engineering, Seoul National University, Shinlim-dong, Kwanak-gu, Seoul 151-742, Korea ; Jang, Jyongsik ; Lee, Jun Yeob

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Lifetime improvement of green phosphorescent organic light-emitting diodes by charge confinement inside an emitting layer was investigated. Excitons were confined within the emitting layer by using a charge confining structure with a high doping concentration at the center of the emitting layer. The lifetime of green devices could be improved by more than five times by confining the excitons at the center of the emitting layer.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 20 )