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

Research output: Contribution to journalArticle

78 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

Fingerprint

Light emitting diodes
Surface treatment
Nanostructures
Polymers
light emitting diodes
Organic light emitting diodes (OLED)
Light
polymers
Flexible displays
Electron injection
Mercaptoethanol
Quantum efficiency
Amines
Quenching
Waveguides
Lighting
ripples
illuminating
quantum efficiency
interlayers

All Science Journal Classification (ASJC) codes

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

Cite this

Lee, Bo Ram ; Jung, Eui Dae ; Park, Ji Sun ; Nam, Yun Seok ; Min, Sa Hoon ; Kim, Byeong Su ; Lee, Kyung Min ; Jeong, Jong Ryul ; Friend, Richard H. ; Kim, Ji Seon ; Kim, Sang Ouk ; Song, Myoung Hoon. / Highly efficient inverted polymer light-emitting diodes using surface modifications of ZnO layer. In: Nature communications. 2014 ; Vol. 5.
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Lee, BR, Jung, ED, Park, JS, Nam, YS, Min, SH, Kim, BS, Lee, KM, Jeong, JR, Friend, RH, Kim, JS, Kim, SO & Song, MH 2014, 'Highly efficient inverted polymer light-emitting diodes using surface modifications of ZnO layer', Nature communications, vol. 5, 4840. https://doi.org/10.1038/ncomms5840

Highly efficient inverted polymer light-emitting diodes using surface modifications of ZnO layer. / Lee, Bo Ram; Jung, Eui Dae; Park, Ji Sun; Nam, Yun Seok; Min, Sa Hoon; Kim, Byeong Su; Lee, Kyung Min; Jeong, Jong Ryul; Friend, Richard H.; Kim, Ji Seon; Kim, Sang Ouk; Song, Myoung Hoon.

In: Nature communications, Vol. 5, 4840, 2014.

Research output: Contribution to journalArticle

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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

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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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