Solution-processed sodium hydroxide as the electron injection layer in inverted bottom-emission organic light-emitting diodes

We present inverted bottom-emission organic light-emitting diodes (IBOLEDs), consisting of tris-(8-hydroxyquinoline)aluminum (Alq 3 ) as the emissive layer and an ultrathin layer of sodium hydroxide (NaOH) on top of indium tin oxide (ITO) as the electron injection layer. The devices with NaOH treate...

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Bibliographic Details
Published inJournal of materials chemistry. C, Materials for optical and electronic devices Vol. 3; no. 16; pp. 3922 - 3927
Main Authors Wang, Danbei, Wu, Yuanwu, Bi, Ran, Zhang, Hongmei, Zhao, Dewei
Format Journal Article
LanguageEnglish
Published 01.01.2015
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Summary:We present inverted bottom-emission organic light-emitting diodes (IBOLEDs), consisting of tris-(8-hydroxyquinoline)aluminum (Alq 3 ) as the emissive layer and an ultrathin layer of sodium hydroxide (NaOH) on top of indium tin oxide (ITO) as the electron injection layer. The devices with NaOH treated by water vapor and CO 2 and annealing show higher current efficiency than those with NaOH that are untreated. The current efficiency (6 cd A −1 ) of the optimal devices with treated NaOH layer is improved. The enhancement is attributed to the reduction in barrier height for electron injection due to the dipole formation caused by the conversion of NaOH to sodium carbonate. Thin sodium hydroxide treated by blowing CO 2 and water vapor in inverted organic light-emitting diodes exhibits improved efficiency.
ISSN:2050-7526
2050-7534
DOI:10.1039/c5tc00085h