Highly efficient inverted polymer light-emitting diodes using surface modifications of ZnO layer

Bo Ram Lee, Eui Dae Jung, Ji Sun Park, Yun Seok Nam, Sa Hoon Min, Byeong Su Kim, Kyung Min Lee, Jong Ryul Jeong, Richard H. Friend, Ji Seon Kim, Sang Ouk Kim, Myoung Hoon Song

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94 Citations (Scopus)

Abstract

Organic light-emitting diodes have been recently focused for flexible display and solid-state lighting applications and so much effort has been devoted to achieve highly efficient organic light-emitting diodes. Here, we improve the efficiency of inverted polymer light-emitting diodes by introducing a spontaneously formed ripple-shaped nanostructure of ZnO and applying an amine-based polar solvent treatment to the nanostructure of ZnO. The nanostructure of the ZnO layer improves the extraction of the waveguide modes inside the device structure, and a 2-ME+EA interlayer enhances the electron injection and hole blocking in addition to reducing exciton quenching between the polar-solvent-treated ZnO and the emissive layer. Therefore, our optimized inverted polymer light-emitting diodes have a luminous efficiency of 61.6cd A-1 and an external quantum efficiency of 17.8%, which are the highest efficiency values among polymer-based fluorescent light-emitting diodes that contain a single emissive layer.

Original languageEnglish
Article number4840
JournalNature communications
Volume5
DOIs
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Lee, B. R., Jung, E. D., Park, J. S., Nam, Y. S., Min, S. H., Kim, B. S., Lee, K. M., Jeong, J. R., Friend, R. H., Kim, J. S., Kim, S. O., & Song, M. H. (2014). Highly efficient inverted polymer light-emitting diodes using surface modifications of ZnO layer. Nature communications, 5, [4840]. https://doi.org/10.1038/ncomms5840