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Imaging Joule heating in a conjugated-polymer light-emitting diode using a scanning thermal microscope.

Boroumand, F. A. and Voigt, M. and Lidzey, D. G. and Hammiche, Azzedine and Hill, G. (2004) Imaging Joule heating in a conjugated-polymer light-emitting diode using a scanning thermal microscope. Applied Physics Letters, 84 (24). pp. 4890-4892. ISSN 1077-3118

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Abstract

We have used a scanning thermal microscope to image Joule heating in a conjugated-polymer light-emitting diode (LED). Our LEDs had an active diameter of 100 µm, which was defined using an insulating layer of silicon nitride patterned onto the LED anode. At an average power input of 0.2 mW into the LED, we find that the center of the cathode is some 0.2 K warmer than its periphery. The observed temperature distribution across the pixel is slightly asymmetric, an effect which may be correlated with spatial inhomogeneity in the local current density across the device. We present a finite element analysis thermal model which is able to accurately describe the observed temperature distribution across the LED cathode.

Item Type: Article
Journal or Publication Title: Applied Physics Letters
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 9295
Deposited By: Ms Margaret Calder
Deposited On: 03 Jun 2008 15:03
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 22:16
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9295

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