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 1077-3118Full text not available from this repository.
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.
|Journal or Publication Title:||Applied Physics Letters|
|Subjects:||Q Science > QC Physics|
|Departments:||Faculty of Science and Technology > Physics|
|Deposited By:||Ms Margaret Calder|
|Deposited On:||03 Jun 2008 15:03|
|Last Modified:||26 Jul 2012 18:34|
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