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

doi:10.1038/ncomms5840

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

138 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 language	English
Article number	4840
Journal	Nature communications
Volume	5
DOIs	https://doi.org/10.1038/ncomms5840
Publication status	Published - 2014

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© 2014 Macmillan Publishers Limited. All rights reserved.

All Science Journal Classification (ASJC) codes

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

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10.1038/ncomms5840

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title = "Highly efficient inverted polymer light-emitting diodes using surface modifications of ZnO layer",

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.",

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

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AU - Lee, Bo Ram

AU - Jung, Eui Dae

AU - Park, Ji Sun

AU - Nam, Yun Seok

AU - Min, Sa Hoon

AU - Kim, Byeong Su

AU - Lee, Kyung Min

AU - Jeong, Jong Ryul

AU - Friend, Richard H.

AU - Kim, Ji Seon

AU - Kim, Sang Ouk

AU - Song, Myoung Hoon

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

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

Abstract

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