The effect of current crowding on the heat and light pattern in high-power AlGaAs light emitting diodes

Zinovchuk, A. V. and Malyutenko, O. Yu. and Malyutenko, V. K. and Podoltsev, A. D. and Vilisov, A. A. (2008) The effect of current crowding on the heat and light pattern in high-power AlGaAs light emitting diodes. Journal Of Applied Physics, 104. ISSN 1089-7550

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Abstract

The results of the light and temperature micromapping in AlGaAs light emitting diodes grown by liquid phase epitaxy as double heterostructures and emitting at ��0.87 �m are presented. At a driving current well above the safe operating limit ��300 mA�, the nonuniform light pattern and local self-heating �with temperature gradient of about 950 °C/cm� followed by catastrophic degradation of a device were detected with the charge coupled device and infrared microscopes operating in a pulsed mode. These were shown to result from the current crowding effect in the active and contact areas of a device. Good agreement between the theory and experiment was found

Item Type: Article
Uncontrolled Keywords: current crowding, AlGaAs , temperature gradient
Subjects: Q Science > QC Physics
Divisions: Faculty of Physics and Mathematics > Department of Physics
Depositing User: Богдан Свищ
Date Deposited: 22 Apr 2016 08:53
Last Modified: 10 Oct 2016 09:10
URI: http://eprints.zu.edu.ua/id/eprint/8346

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