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Thermally induced surface instabilities in polymer light emitting diodes

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4 Author(s)
Akande, Wali O. ; Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, USA ; Akogwu, Onobu ; Tong, Tiffany ; Soboyejo, Wole

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The role of thermal gradients and their attendant mechanical stresses in the overall stability of organic electronic devices has been elucidated through the occurrence of spiral shaped blisters that develop on the surface of suitably biased polymer light emitting diodes. A model based on the spontaneous disordering (or ordering) of polymeric thin film systems has been used to explain the formation and growth of these blisters. The model is shown to provide insights into how thermal stresses affect the overall stability of organic electronic devices. The implications of the results are then discussed for the design of flexible organic electronic devices.

Published in:

Journal of Applied Physics  (Volume:108 ,  Issue: 2 )