Pressure-assisted fabrication of organic light emitting diodes with MoO3 hole-injection layer materials

Jing Du, V. C. Anye, E. O. Vodah, T. Tong, M. G. Zebaze Kana, W. O. Soboyejo

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this study, pressures of ∼5 to ∼8 MPa were applied to organic light emitting diodes containing either evaporated molybdenum trioxide (MoO 3) or spin-coated poly(3,4-ethylene dioxythiophene) doped with poly(styrene sulphonate) (PEDOT:PSS) hole-injection layers (HILs). The threshold voltages for both devices were reduced by about half, after the application of pressure. Furthermore, in an effort to understand the effects of pressure treatment, finite element simulations were used to study the evolution of surface contact between the HIL and emissive layer (EML) under pressure. The blister area due to interfacial impurities was also calculated. This was shown to reduce by about half, when the applied pressures were between ∼5 and 8 MPa. The finite element simulations used Young's modulus measurements of MoO3 that were measured using the nanoindentation technique. They also incorporated measurements of the adhesion energy between the HIL and EML (measured by force microscopy during atomic force microscopy). Within a fracture mechanics framework, the implications of the results are then discussed for the pressure-assisted fabrication of robust organic electronic devices.

Original languageEnglish (US)
Article number233703
JournalJournal of Applied Physics
Volume115
Issue number23
DOIs
StatePublished - Jun 21 2014

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light emitting diodes
injection
fabrication
blisters
fracture mechanics
sulfonates
nanoindentation
threshold voltage
molybdenum
modulus of elasticity
polystyrene
adhesion
ethylene
simulation
atomic force microscopy
impurities
electronics
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Du, Jing ; Anye, V. C. ; Vodah, E. O. ; Tong, T. ; Zebaze Kana, M. G. ; Soboyejo, W. O. / Pressure-assisted fabrication of organic light emitting diodes with MoO3 hole-injection layer materials. In: Journal of Applied Physics. 2014 ; Vol. 115, No. 23.
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Pressure-assisted fabrication of organic light emitting diodes with MoO3 hole-injection layer materials. / Du, Jing; Anye, V. C.; Vodah, E. O.; Tong, T.; Zebaze Kana, M. G.; Soboyejo, W. O.

In: Journal of Applied Physics, Vol. 115, No. 23, 233703, 21.06.2014.

Research output: Contribution to journalArticle

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AU - Zebaze Kana, M. G.

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