Highly flexible organic light-emitting diodes on patterned Ag nanowire network transparent electrodes

Ross E. Triambulo, Jin Hoon Kim, Jin Woo Park

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, the performance stability of solution-processed flexible organic light-emitting diodes (f-OLEDs) in relation to the mechanical stability of their flexible transparent electrode (f-TE) bottom anodes and component functional layers was analyzed. The polymer-based hole transport and emission layer (HTL and EML, respectively) materials (poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) and Super Yellow, respectively), which are normally considered to have compliant mechanical properties due to their organic composition, had significantly variations in their bending stability depending on the type of f-TE anode used in the f-OLEDs. The HTL and EML showed brittle fractures when coated atop the widely used but brittle indium tin oxide (ITO) reference anode and on the otherwise highly flexible silver nanowire network (AgNW)-ITO hybrid f-TE. In contrast, the HTL and EML showed excellent bending stability when coated atop a AgNW-only anode. The ductile properties of the component metallic nanowires and deformable networked structure of the AgNWs had a stress-releasing effect on the f-OLED, which resulted in discontinuous and localized fragmentation of the f-OLED functional layers coated atop of it during the bending test. The patterning of the AgNWs into line patterns improved the reduction in the internal residual stress in the AgNW-based f-OLED, while serpentine patterning of the AgNW anode further localized the deformation stresses or strain at the troughs and crests of the pattern. Hence, the bending stability of the AgNW-based f-OLED was significantly improved when line- and serpentine-patterned AgNW (l-AgNW and s-AgNW, respectively) f-TEs were used as the anodes.

Original languageEnglish
Pages (from-to)220-226
Number of pages7
JournalOrganic Electronics
Volume71
DOIs
Publication statusPublished - 2019 Aug

Fingerprint

Organic light emitting diodes (OLED)
Nanowires
Anodes
anodes
nanowires
light emitting diodes
Electrodes
electrodes
Tin oxides
indium oxides
Indium
tin oxides
residual stress
Residual stresses
Mechanical stability
Bending tests
Brittle fracture
releasing
troughs
Silver

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

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title = "Highly flexible organic light-emitting diodes on patterned Ag nanowire network transparent electrodes",
abstract = "In this study, the performance stability of solution-processed flexible organic light-emitting diodes (f-OLEDs) in relation to the mechanical stability of their flexible transparent electrode (f-TE) bottom anodes and component functional layers was analyzed. The polymer-based hole transport and emission layer (HTL and EML, respectively) materials (poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) and Super Yellow, respectively), which are normally considered to have compliant mechanical properties due to their organic composition, had significantly variations in their bending stability depending on the type of f-TE anode used in the f-OLEDs. The HTL and EML showed brittle fractures when coated atop the widely used but brittle indium tin oxide (ITO) reference anode and on the otherwise highly flexible silver nanowire network (AgNW)-ITO hybrid f-TE. In contrast, the HTL and EML showed excellent bending stability when coated atop a AgNW-only anode. The ductile properties of the component metallic nanowires and deformable networked structure of the AgNWs had a stress-releasing effect on the f-OLED, which resulted in discontinuous and localized fragmentation of the f-OLED functional layers coated atop of it during the bending test. The patterning of the AgNWs into line patterns improved the reduction in the internal residual stress in the AgNW-based f-OLED, while serpentine patterning of the AgNW anode further localized the deformation stresses or strain at the troughs and crests of the pattern. Hence, the bending stability of the AgNW-based f-OLED was significantly improved when line- and serpentine-patterned AgNW (l-AgNW and s-AgNW, respectively) f-TEs were used as the anodes.",
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Highly flexible organic light-emitting diodes on patterned Ag nanowire network transparent electrodes. / Triambulo, Ross E.; Kim, Jin Hoon; Park, Jin Woo.

In: Organic Electronics, Vol. 71, 08.2019, p. 220-226.

Research output: Contribution to journalArticle

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