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Posttime: 10 Dec, 2013 Views: 90 Author: Jacky

The optical proper of LED has obvious difference in different temperature.

The optical proper of LED has obvious difference in different temperature. The luminous quantity (Luminous Intensity) of LED can reduce with the junction temperature increasing, for some technology, the emission wavelength will also change with the temperature. If we don’t control the drive current and junction temperature, the efficiency of LED will decrease rapidly, which result in reduced brightness(Brightness Meter) and shortened life. And another characteristics of LED related to junction temperature is the forward voltage(Figure 1), VF is the LED forward drop voltage, when the conduction begins, VF is about 2V(for red LED) and 3.5V(for blue LED); TF is the LED internal temperature in the PN junction. If the temperature is too high, LED will be damaged; It is the forward current via LED.

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