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Measuring LED Junction Temperature

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In situ tests are conducted using a bench digital multimeter and a fast-pulsed current source.

Jeff Hulett, Vektrex Electronic Systems Inc., and Chris Kelly, Agilent Technologies Inc.

Manufacturers and solid-state lighting developers are driving LEDs to higher power levels. As more energy is pushed through the LED diode junction, heat removal becomes a critical issue. To assure device lifetime, quantum efficiency and LED color, the diode junction temperature must be maintained within a specified band. The small size of the LED and its surrounding optics makes measuring the diode junction temperature difficult to perform with direct methods, such as thermocouples and infrared cameras. Fortunately, it can be measured indirectly using the LED diode junction’s...Read full article

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