Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15147
Title: Evolution of dark spots in organic light emitting devices
Authors: LIEW YOON FEI
Keywords: electroluminescence, organic light emitting device (OLED), degradation, dark spot, galvanic cell, interface
Issue Date: 16-Jan-2006
Source: LIEW YOON FEI (2006-01-16). Evolution of dark spots in organic light emitting devices. ScholarBank@NUS Repository.
Abstract: The degradation of organic light emitting devices (OLEDs) often correlates to the formation of dark spots in active area of the device. An optical image analysis technique is developed to investigate the evolution of dark spots under non-operation condition. Investigation of organic/cathode and anode/organic interfaces with respect to their morphologies and chemical states was carried out using atomic force microscopy and X-ray photoelectron spectroscopy. Results reveal that anode/organic interface play an important role in determining the growth of dark spots. A model of dark spot formation in OLEDs under non-operation condition is proposed. The growth of dark spots is associated to the corrosion or oxidation process of reactive cathode. The growth of dark spots is accelerated by the formation of a galvanic cell between cathode and anode in OLEDs. The galvanic cell is formed due to the presence of an internal built-in potential, induced by a pair of dissimilar electrodes in OLEDs.
URI: http://scholarbank.nus.edu.sg/handle/10635/15147
Appears in Collections:Ph.D Theses (Open)

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