Electric and Thermal Transient Effects in Optical Devices

In the case of opto-electronic devices the power applied on the device leaves in a parallel heat and light transport. For this reason the interpretation of Rth is not obvious. By studying electrical and thermal transients in high power LEDs this paper proposes a multi-domain "compact" model suitable for correct simulation of single devices as well as LED arrays in a board-level simulation environment. The thermal part of the model has been identified from structure functions extracted from measured thermal transients. Several measurements were carried out in a combined photometric/thermal measurement setup, which is proposed for the characterization of power LEDs. Transient simulation results compared to measured transients are also presented.


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