Influence of the use of a thermal pad on electric, optical and thermal parameters of selected power LEDs

In this paper the influence of the use of thermal pads on electric, optical and thermal parameters of LEDs is considered. For a selected type of power LED operating with a thermal pad and without it, such parameters as: thermal resistance, optical efficiency, power of emitted radiation are measured for selected values of diode forward current. The results of measurements obtained for both manners of diode assembly are compared. Some characteristics illustrating electric, thermal and optical properties of these diodes are shown and discussed. It is proved that the use of a thermal pad makes it possible to achieve better values of operating parameters of the considered power LEDs and lower values of the device internal temperature, which guarantees longer life time of the considered devices.

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