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Title: Degradation study in flexible substrate organic light-emitting diodes
Authors: Ke, L.
Kumar, R.S.
Chua, S.J. 
Burden, A.P.
Issue Date: Oct-2005
Citation: Ke, L., Kumar, R.S., Chua, S.J., Burden, A.P. (2005-10). Degradation study in flexible substrate organic light-emitting diodes. Applied Physics A: Materials Science and Processing 81 (5) : 969-974. ScholarBank@NUS Repository.
Abstract: Indium tin oxide (ITO) coated polycarbonate (PC) multilayer flexible substrates have been subjected to different cycles of bending. Atomic force microscopy (AFM) results on bent ITO surfaces show that bending results in much rougher ITO surfaces. The Ca degradation test shows that the ITO cracks are perpendicular to the flexing direction and that barrier performance deteriorated after bending. When an organic light emitting device is fabricated on the bent substrate, electrical and optical performance decrease. This can be attributed to moisture and oxygen permeated through deteriorated substrate and barrier degraded polymer and oxidized cathode materials. However, optical microscopy observation found that the dark spots have less relationship with the size and position of the cracks on oxide film. Instead to a great extent, they are directly related to the ITO surface spikes. The results further prove that the dark spot is due to electrical stress generated by intense local current at sharp anode and cathode points, which degrade the polymer causing the formation of the dark center. © Springer-Verlag 2005.
Source Title: Applied Physics A: Materials Science and Processing
ISSN: 09478396
DOI: 10.1007/s00339-004-3134-8
Appears in Collections:Staff Publications

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