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 and Myoung Hoon Song ()
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Bo Ram Lee: School of Materials Science and Engineering and KIST-UNIST Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST)
Eui Dae Jung: School of Materials Science and Engineering and KIST-UNIST Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST)
Ji Sun Park: Energy Nano Materials Research Center, Korea Electronics Technology Institute (KETI)
Yun Seok Nam: School of Materials Science and Engineering and KIST-UNIST Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST)
Sa Hoon Min: Ulsan National Institute of Science and Technology (UNIST)
Byeong-Su Kim: Ulsan National Institute of Science and Technology (UNIST)
Kyung-Min Lee: Graduate School of Green Energy Technology, Chungnam National University
Jong-Ryul Jeong: Graduate School of Green Energy Technology, Chungnam National University
Richard H. Friend: Cavendish Laboratory
Ji-Seon Kim: Imperial College London
Sang Ouk Kim: Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), KAIST
Myoung Hoon Song: School of Materials Science and Engineering and KIST-UNIST Ulsan Center for Convergent Materials, Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: 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 61.6 cd 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.

Date: 2014
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DOI: 10.1038/ncomms5840

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