TITLE

Mechanism of dark-spot degradation of organic light-emitting devices

AUTHOR(S)
Melpignano, P.; Baron-Toaldo, A.; Biondo, V.; Priante, S.; Zamboni, R.; Murgia, M.; Caria, S.; Gregoratti, L.; Barinov, A.; Kiskinova, M.
PUB. DATE
January 2005
SOURCE
Applied Physics Letters;1/24/2005, Vol. 86 Issue 4, p041105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Using chemically sensitive x-ray photoelectron microscopy, we investigate the mechanism of dark-spot formation and degradation of organic light-emitting devices. The morphological and chemical evolution of the Al cathode surface under operation conditions reveals the formation of “domelike” structures, followed by local disruptions of the cathode, exposing microareas of the underlying indium tin oxide anode. The chemical maps and microspot spectra identify a release of volatile In-, Sn-, and C-containing species, including metallic In, which is clear evidence that the degradation is driven by local decomposition of the anode/organic interface.
ACCESSION #
15925580

 

Related Articles

  • Efficient inverted top-emitting organic light-emitting diodes using ultrathin MoO3/C60 bilayer structure to enhance hole injection. Hou, Jianhua; Wu, Jiang; Xie, Zhiyuan; Wang, Lixiang // Applied Physics Letters;11/16/2009, Vol. 95 Issue 20, p203508 

    Efficient inverted top-emitting organic light-emitting diodes with aluminum (Al) as both the cathode and semitransparent anode are investigated. It is found that introduction of the ultrathin molybdenum trioxide (MoO3)/fullerene (C60) bilayer structure between the low work function Al top anode...

  • Efficient hole injection in organic light-emitting diodes using C60 as a buffer layer for Al reflective anodes. Jun Yeob Lee // Applied Physics Letters;2/13/2006, Vol. 88 Issue 7, p073512 

    The hole injection of the organic light-emitting diodes with Al as a reflective anode for top-emitting devices was improved by using C60 as a thin buffer layer between Al and a hole transport layer. The driving voltage of the devices with C60 buffer layer was 5.5 V compared with 11 V for the...

  • Modeling of organic light-emitting diodes with graded concentration in the emissive multilayer. Gusso, A.; Ma, Dongge; Hümmlegen, I. A.; da Luz, M. G. E. // Journal of Applied Physics;2/15/2004, Vol. 95 Issue 4, p2056 

    We model the electrical behavior of organic light-emitting diodes whose emissive multilayer is formed by blends of an electron transporting material, tris-(8-hydroxyquinoline) aluminum (Alq[sub 3]) and a hole transporting material, N,N[sup ′]-diphenyl-N,N[sup ′]-bis(1,1[sup...

  • High-efficiency top-emitting organic light-emitting devices. Lu, M.-H.; Weaver, M. S.; Zhou, T. X.; Rothman, M.; Kwong, R. C.; Hack, M.; Brown, J. J. // Applied Physics Letters;11/18/2002, Vol. 81 Issue 21, p3921 

    Based on theoretical arguments that top-emitting organic light-emitting devices (TOLEDs) can be more efficient than equivalent bottom-emitting devices, we fabricated TOLEDs comprising reflective anodes and transparent compound cathodes that emit 20.8% more photons in the forward 120° cone...

  • Interface properties of a Li3PO4/Al cathode in organic light emitting diodes. Gassmann, Andrea; Melzer, Christian; Mankel, Eric; Jaegermann, Wolfram; von Seggern, Heinz // Journal of Applied Physics;Jun2009, Vol. 105 Issue 12, p124517 

    Recently Li3PO4/Al has been introduced as an alternative cathode for the commonly used LiF/Al system for organic light emitting diodes (OLEDs) due to its competitive electron injection properties. In the present article the interfaces of the organic semiconductor with the Li3PO4/Al bilayer...

  • OLEDs - Lighting's New Wave. Eley, Laura // Canadian Consulting Engineer;Aug/Sep2015, Vol. 56 Issue 5, p51 

    The article offers information on the lighting technology organic light-emitting diodes (OLEDs) which could transform the lighting of spaces, with their flexible, thin surfaces that can be wrapped around different forms. Topics include OLED consisting of an OLED-stack layers of organic materials...

  • Efficient electron injection in organic light-emitting diodes using lithium quinolate/Ca/Al cathodes. Kim, Sung Hyun; Jang, Jyongsik; Lee, Jun Yeob // Applied Physics Letters;9/3/2007, Vol. 91 Issue 10, p103501 

    Device performances of green devices with cathode structure of lithium quinolate (Liq)/Ca/Al were investigated and electron injection mechanism was studied using ultraviolet photoelectron spectroscopy. Power efficiency could be improved by 70% by using Liq/Ca/Al cathode structure due to...

  • Metal diffusion from electrodes in organic light-emitting diodes. Lee, S.T.; Gao, Z.Q.; Hung, L.S. // Applied Physics Letters;9/6/1999, Vol. 75 Issue 10, p1404 

    Studies metal diffusion from magnesium-silver cathodes and indium-tin-oxide anodes in organic light-emitting diodes. Absence of magnesium diffusion under device operation; Effect on luminance decay with operation time.

  • Efficient bottom cathodes for organic light-emitting devices. Jie Liu; Duggal, Anil R.; Shiang, Joseph J.; Heller, Christian M. // Applied Physics Letters;8/2/2004, Vol. 85 Issue 5, p837 

    Bilayers of aluminum and an alkali fluoride are well-known top cathode contacts for organic light-emitting devices but have never been successfully applied as bottom contacts. We describe a bilayer bottom cathode contact for organic electronic devices based on reversing the well-known top...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics