Thermal, optical and electrical parameters are main characterization of light-emitting diodes (LEDs). Consumers are
often concerned about the explicit properties such as luminous intensity, luminous flux and color. But Manufacturers
may pay more attention to the thermal characteristic. Excess heat at the junction directly affects the LED performance in
terms of color shit, light output and life. To measure all these parameters of LED accurately and simultaneously, we
designed an integrated system, product number SSP8112, which was based on a new developed thermal, optical and
electrical measurement instrument and a specially-made integrating sphere with temperature controller. The thermal
measurement segment of the instrument was developed in accordance with JESD51-1 standard; it can automatically
record the transient response curve of heat with a 50μs time resolution and a 0.5mV voltage resolution. And the
integrating sphere, which has high light reflectivity, good thermal insulation and tolerance to high temperature, was used
to achieve the optical response during the experiment. The principle and structure of this system were introduced and
discussed, and at the end an application example was presented.
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